ICE Marine Engine Systems Questions PDF

REVERSING - 10 MANOEUVRING - 10 L. O. SYSTEMS - 18 GOVERNOR - 13 EMERGENCY RUNNING - 4 AIR SYSTEMS - 23 CW SYSTEMS - 8 CRANKCASE EXPLOSION - 11 CRANKCASE RELIEF VALVE – 9  REVERSING Question No: 1 In both RD and RND engines, the reversing angle is --degre...

REVERSING - 10 MANOEUVRING - 10 L. O. SYSTEMS - 18 GOVERNOR - 13 EMERGENCY RUNNING - 4 AIR SYSTEMS - 23 CW SYSTEMS - 8 CRANKCASE EXPLOSION - 11 CRANKCASE RELIEF VALVE – 9  REVERSING Question No: 1 In both RD and RND engines, the reversing angle is --degrees. 96 97 98 95 Question No: 2 An oil dash pot connected to piston of hydraulic or pneumatic servomotor to smooth out the motion of parts by providing cushioning effect and prevent shock TRUE FALSE N/A N/A Question No: 3 The angular distance through which camshaft is turned in the opposite direction relative to the crankshaft is referred to as Added Motion Turning Motion Lost Motion None of the previous statements are correct Question No: 4 In RD engines, which has exhaust rotary valves, are turned by --- degrees during reversing. 160 150 170 168 Question No: 5 A marine diesel engine which is directly coupled with a fixed pitch propeller may not be reversible  TRUE FALSE N/A N/A Question No: 6 In Sulzer RTA engines fuel cams are turned by --- degrees in the direction opposite while camshaft is stationary 50 60 70 80 Question No: 7 In Sulzer RTA engines Starting air distributor cams are turned by --- degrees in the opposite direction while camshaft is stationary 97 98 86 99 Question No: 8 Running direction interlock, if activated, prevent admission of Air Fuel Water Lube oil Question No: 9 In reversible engine reversing function is achieved by changing the position of fuel cam only changing the position of air distributor cam only changing the position of both fuel and air distributor cam  none of the above Question No: 10 Crash manoeuvring is the application of brake air, whilst the engine is still turning in the opposite direction TRUE FALSE N/A N/A  MANOEUVRING Question No: 1 Before starting the engine must ensure turning gear is disengaged all the required pumps are running and interlocks are in correct order, not bypassed drain the water from air bottle and control air system all of the above Question No: 2 As soon as a diesel engine has started, which of the listed engine operating parameters should be checked FIRST? Exhaust temperatures Raw water pressure Lube oil pressure Air box pressure Question No: 3 Only in emergency condition, safety devices can be overridden TRUE FALSE N/A N/A Question No: 4 While operating engine from "Local Control Position" fuel rack is directly control by the position of "Fuel Lever" TRUE FALSE N/A N/A Question No: 5 While operating engine from "Local Control Position" governor is bypassed TRUE FALSE  N/A N/A Question No: 6 While changing over control position of main engine operation the engine must be stopped TRUE FALSE N/A N/A Question No: 7 Different Types of protections on a Ship?s Main Engine are Slow down Shut down Interlocks All of the previous statements are correct Question No: 8 Most of the collisions and grounding of ships are reported during manoeuvring of the vessels TRUE FALSE N/A N/A Question No: 9 Which is not a "shut Down" on main engine Lube oil inlet pressure to engine is very low Thrust block temperature very high Over speed of the engine High exhaust temperatures Question No: 10 A 2 stroke engine is usually equipped with an auxiliary blower fan, which is supposed to be used:  continuously, together with the turbochargers to ensure enough air to the engine during full speed running. during continuously reduced speed under a longer sea voyage. during manoeuvre and manoeuvre speed condition (arrival and departure) during a scavenging fire, to help put out the fire.  L. O. SYSTEMS Question No: 1 Before starting a diesel engine using an attached lube oil pump, the engineer should open the bypass line cut in the lube oil cooler pressurize the lube oil system top up the expansion tank Question No: 2 In typical 4 stroke engine rocker arms, cam shaft & fuel pump rollers are lubricated by separate oil connection from oil pump discharge line. TRUE FALSE N/A N/A Question No: 3 Sticking of diesel engine piston compression rings may be caused by high compression pressure excessive ring action excessive cylinder lubrication improper ring rotation Question No: 4 Elastio-hydrodynamic lubrication used in Main bearing Meshing gear teeth Cylinder walls Rocker arms Question No: 5 There are two types of lubrication for camshaft bearings, fuel and exhaust valve roller guides. Uni-Lube System Without Uni-Lube System TRUE FALSE  N/A N/A Question No: 6 The lube oil system in a large two stroke marine propulsion engine can best be described as a _______. dry sump system wet sump system shunt system bypass system Question No: 7 In typical 4 stroke engine cylinder walls, piston and rings are lubricated by oil spraying around TRUE FALSE N/A N/A Question No: 8 In typical 4 stroke engine oil passes to from connecting rod bearing to main bearing TRUE FALSE N/A N/A Question No: 9 Why do we use cylinder oil? To neutralize the sulphur and get a lubricating oil film between piston rings and liner. To get a lubricating oil film between piston rings and liner. To neutralize the sulphur in the fuel. To avoid blowby. Question No: 10 In two stroke large marine engines the piston cooling oil is supplied via the telescopic pipe to a bracket on the crosshead.  TRUE FALSE N/A N/A Question No: 11 Which is not the type of lubrication Mist lubrication Wet sump lubrication Dry sump lubrication Semi dry sump lubrication Question No: 12 Which is the type of wet sump lubrication Splash Lubrication Splash and Pressure Pressure feed lubrication All of the previous statements is correct Question No: 13 In four stroke engines used for power generation, the sump oil is completely renewed and sump cleaned about every 2500 hrs TRUE FALSE N/A N/A Question No: 14 For large marine engines lube oil purification done Continuously Intermittently Once a month As required Question No: 15 The cylinder oil for FO with high sulphur content is supposed to be: acidic. Alkaline neutral. does not matter. Question No: 16 In typical 4 stroke engine oil from crankpin reaches small end (gudgeon) bearing through a hole drilled in con rod TRUE FALSE N/A N/A Question No: 17 Witch is not the type of lubrication Hydrodynamic Hydrostatic Elastio - hydrodynamic External lubrication Question No: 18 Function of lubrication system is Reduces friction Helps in cooling Prevents accumulation of unwanted deposits All of the previous statements is correct  GOVERNOR Question No: 1 With respect to engine governor, identify the wrong statement. The function of governor to maintain the speed of engine within close limits, from no load speed to full rated speed. The function of governor is to control either the engine speed or the engine load. Isochronous Governor maintains a `constant speed?, irrespective of load and power changes. Example: Propultion Engines Isochronous Governor maintains a `constant speed?, irrespective of load and power changes. Example: Auxiliary Engines Question No: 2 Dead Band: band or range in speed, only after which the governor will respond TRUE FALSE N/A N/A Question No: 3 Hunting: fluctuation in the engine speed due to over or under control of the governor. TRUE FALSE N/A N/A Question No: 4 The function of governor to control either the engine speed or the engine load TRUE FALSE N/A N/A Question No: 5 With respect to engine over speed governor, identify the wrong statement.  Over speed governor not to be tested periodically. Sometimes engines are fitted with two independent over speed trips, an electro-pneumatic device with trip is set at 15% above nominal speed and a mechanical device with trip is set at 18% above nominal speed. Question No: 6 Isochronous Governor Maintains a `constant speed?, irrespective of load and power changes. Maintains a `constant load?, irrespective of speed and power changes. Maintains a `constant power?, All of the previous statements are correct Question No: 7 With respect to engine governor, identify the correct statement. Droop is speed from stable no load condition to unstable full load condition, i.e. a fall in speed due to load changes. Sensitivity is the smallest change for which the governor does not respond to the required output signal. Hunting is fluctuation in the engine speed due to over or under control of the governor, a result of high sensitivity. Dead Band is a band or range in speed, after which the governor does not respond. Question No: 8 With respect to engine governor, identify the wrong statement. Droop is speed from stable no load condition to stable full load condition, i.e. a fall in speed due to load changes. Sensitivity is the smallest change for which the governor responds with the required output signal. Sensitivity implies that the governor can control the speed within very narrow limits. Dead Band is a band or range in speed, after which the governor does not respond. Question No: 9 With respect to engine over speed governor, identify the wrong statement. An over-speed trip is required to ensure that fuel supply will be cut off from engine if its speed exceeds the predetermined value. Any over-speed trip should be able to reset automatically after speed is reduced. Any over-speed trip requires manual resetting. It should not be able to automatically reset after speed is reduced. Over-speeding will result from sudden removal of engine load. Question No: 10 Variable Speed Governors Where there is a facility to adjust the set speed on the governor according to the load TRUE FALSE N/A N/A Question No: 11 The function of governor to maintain the speed of engine within close limits, from no load speed to full rated speed TRUE FALSE N/A N/A Question No: 12 Too much sensitivity can cause `hunting?.  TRUE FALSE N/A N/A Question No: 13 With respect to engine governor, identify the correct statement. Isochronous Governor maintains a `constant speed?, irrespective of load and power changes. Example: Propultion Engines Variable Speed Governor has facility to adjust the set speed on the governor according to the load. Example: Auxileary Engine governor The function of governor is to control the engine speed. Variable Speed Governor has facility to adjust the set speed on the governor according to the load. Example: Main Engine governor  EMERGENCY RUNNING Question No: 1 If we take out the connecting rod we need to suspend pisto along with cross head TRUE FALSE N/A N/A Question No: 2 To put the turbocharger out of action in engine with one turbocharger, we need to Stop the engine Lock the rotor of the defective turbocharger Remove the compensator between the compressor outlet and the scavenge air duct. All of the previous statements Question No: 3 The correct procedure to cut-out combustion and compression while Piston and exhaust valve gear still working Cut out the fuel pump by lifting and securing the roller guide Put the exhaust valve out of action and lock it in the open position Close the cooling water inlet and outlet valves for the cylinder. If necessary, drain the cooling water spaces completely All of the previous statements Question No: 4 To put the exhaust valve out of action and lock it in the open we have to shut-off the air supply to the exhaust valve, stop the lube oil pumps. Dismantle and block the actuator oil pipe. Restart the lube oil pump TRUE FALSE N/A N/A  Air systems Question No: 1 Usually in starting air distributor inverse cam (negative cam) is used as starting air cam. TRUE FALSE N/A N/A Question No: 2 In starting air system the overlap of air stsrting valve opening is reduced as number of cylinders of engine increase TRUE FALSE N/A N/A Question No: 3 Which engine component increases air density and helps to improve engine operating efficiency? impeller compressor aftercooler exhaust diffuser Question No: 4 To fulfill the requirement of the period of starting air admission the period of overlap of crank angle is required TRUE FALSE N/A N/A Question No: 5 The total starting air capacity required for reversible main engines is to be sufficient for a least six consecutive starts  eight consecutive starts ten consecutive starts twelve consecutive starts Question No: 6 what does compressed air do when starting the enging having compressed air starting system supply of air in the cylinder for the combustion to turn the engine at min required rpm so that compression of charge air takes place raising cylinder temp above ignition point to turn the engine and provide combustion air for initial starting of the engine to provide the turning torque for engine scavenging air for combustion Question No: 7 While starting of main engine during ovarlap period --- air starting valves are open 1 2 3 0 Question No: 8 The compressed air acts on top of the piston and produces a starting torque at the crankshaft TRUE FALSE N/A N/A Question No: 9 Pilot air to open cylinder air starting valve is at same pressure as that of air enters the cylinder same as control air pressure same as compression pressure of the engine none of the above Question No: 10 In a compressed air starting system minimum no. of cylinder required to make it possible to start from any crank position are 3-cylinder 4-cylinder any number of cylinder 6-cylinder Question No: 11 In a compressed air starting system-function of the starting air distributor is to provide pilot air for opening the cylinder air starting valve operate the main automatic starting valve carry out the engine reversing function none of the above Question No: 12 excessive difference between combustion pressure and compression pressure in a ME cylinder can be due to low scavenge air pressure change in exhaust valve timing burnt exhaust valves all of the above Question No: 13 Engine needs to have minimum --- number of units, to make it possible to start it from any position 1 2 4 6 Question No: 14 Propulsion engine of a ship started by battery turning gear compressed air  hydraulic arrangement Question No: 15 In a compressed air starting system-function of the starting air distributor is to provide pilot air for opening the cylinder air starting valve operate the main automatic starting valve carry out the engine reversing function none of the above Question No: 16 what does compressed air do when starting the enging having compressed air starting system supply of air in the cylinder for the combustion to turn the engine at min required rpm so that compression of charge air takes place raising cylinder temp above ignition point to turn the engine and provide combustion air for initial starting of the engine to provide the turning torque for engine scavenging air for combustion Question No: 17 The function of starting air distributor is as follows To admit pilot air to that cylinder air starting valve which is in starting position with respect to the direction of rotation To vent air acting on pilot piston of cylinder air starting valve after its air admission is complete and bring about its closing A distributor is driven by a cam mounted on fuel camshaft which brings about starting in the sequence same as that of firing order All of the previous statements is correct Question No: 18 In a two stroke main engine starting air has to be admitted in such a manner that engine can be started in either direction from its any position. This is a important requirement which dictates the period of ignition the period of starting air admission. the period ofignition delay the period of early ignition Question No: 19 Diesel engine requires combustion air supplied from  compressed air system the atmosphere via charge air system air already present in the engine cylinder any of the above Question No: 20 Pilot air to open cylinder air starting valve is at same pressure as that of air enters the cylinder same as control air pressure same as compression pressure of the engine none of the above Question No: 21 before starting the engine must ensure turning gear is disengaged all the required pumps are running and interlocks are in correct order, not bypassed drain the water from air bottle and control air system all of the above Question No: 22 Which are not the way tostart the diesel engine. Manual (Hand) cranking Electric / Air motor start Hydraulic start Direct admission of steam Question No: 23 Diesel engine requires combustion air supplied from compressed air system the atmosphere via charge air system air already present in the engine cylinder any of the above  c.w.systems Question No: 1 if JCW not treated with inhibitors, severe corrsion can occur at certain locations and as system enclosed, this corrosion will not be evident until considerable damage has taken place TRUE FALSE N/A N/A Question No: 2 The ME jacket FW cooling outlet temperature is- 80C 95C 50C 55C Question No: 3 An overheated piston or liner causes This deprives the piston rings of elasticity and causes failures due to sticking of rings. Overheating also reduces cylinder clearance causing distortion and scuffing of piston and liner Thermal stresses trigger off cracks in the piston crown which leads to combustion blow-by. All of the previous statements is correct Question No: 4 Lack of cooling causes non uniform heating of the components inducing thermal stresses TRUE FALSE N/A N/A Question No: 5 The function of the cooling system of a marine diesel engine is not to cool down The engine components  The lubricating oil The scavenging air The cylinder lube oil Question No: 6 A diesel engine cooling water system with a pH factor of 3.0 indicates a condition of. slight acidity slight alkalinity excessive alkalinity excessive acidity Question No: 7 An overheated piston or liner causes deposition of lacquer Evaporation and burning of cylinder lube oil deposition of lacquer and carbon. All of the previous statements is correct Question No: 8 Cooling is not required for Piston Crank case liner Cylinder head  Crank case explosions Question No: 1 Primary crankcase explosion creats a pressure wave which can rapture the crank case TRUE FALSE N/A N/A Question No: 2 In the event of a hot spot being detected The engine may not be slowed and stopped as soon as possible The engine must immediately be slowed and should be stopped as soon as possible Increase the engine RPM Blow through indicator cocks Question No: 3 Secondary crankcase explosion will be of lesser intensity TRUE FALSE N/A N/A Question No: 4 In the event of a hot spot being detected, crank case should be opend immidiately to find the exact location of the hot spot TRUE FALSE N/A N/A Question No: 5 Crankcase mist detector detects the oil mist Well below the concentration required for the explosive conditions. At the concentration required for the explosive conditions.  After the primary explosion has occurred When the hot spot is developed. Question No: 6 The most common cause of lowering of the flash-point of crankcase lubricating oil is contamination with fuel oil TRUE FALSE N/A N/A Question No: 7 To avoid risk of explosions, high closed flash-point of crankcase lubricating oil should normally behave a Above 100 deg. C Above 2000 deg. C Above 200 deg. C Above 500 deg. C Question No: 8 Crank case relief valves are fitted with wire gauge to prevent emission of flames TRUE FALSE N/A N/A Question No: 9 Primary or minor crankcase explosion will occur when white mist comes in contact with hot spot TRUE FALSE N/A N/A Question No: 10 Sub-division of crankcases will prevent build-up of high velocities and pressures of flame propagation through the crank case from a primary explosion  TRUE FALSE N/A N/A Question No: 11 Hot spot in crank case explosion may be formed due to From fires in the spaces adjacent to the crankcase, such as scavenge trunks etc. Blow-past from the engine where no diaphragm is fitted Overheating of bearings All previous statements are correct  Crank case relief valve Question No: 1 Crankcase Relief Valve close instantly after pressure drops and thus preventing ingress of air and eliminate possibility of a major explosion TRUE FALSE N/A N/A Question No: 2 Crankcase Relief Valve disc is made of Brass Aluminum Carbon Fiber Question No: 3 The crankcase relief valve comes under the purview of the CSM TRUE FALSE N/A N/A Question No: 4 Crankcase Relief Valve allowing pressure of the primary or minor explosion to be dissipated and preventing possible rupture of the casing TRUE FALSE N/A N/A Question No: 5 Crankcase Relief Valve are fitted with --- to prevent emission of flames Flame trap Wire gauze  Deflector O' Ring Question No: 6 In Crankcase Relief Valve absence of a valve spindle eliminates risk of valve sticking TRUE FALSE N/A N/A Question No: 7 Regulations demand that for engines of over -- mm bore, one crankcase relief valve of approved design must be fitted to each crankcase and chain case 100 200 300 400 Question No: 8 Crankcase Relief Valve opens at 5 kN/m2 0.5 kN/m2 0.05 kN/m2 50 kN/m2 Question No: 9 Crankcase Relief Valve open automatically at low pressures, TRUE FALSE N/A N/A TOPICS: SUPERCHARGING - 55 CYLINDER HEAD - 27 CYLINDER LINER - 22 CON ROD & X-HEAD - 19 FUEL INJECTOR - 16 CAMSHAFT & DRIVE - 10 BEARINGS - 13 PISTON GLAND & RINGS - 39 SCAVENGING - 6 FUEL LINE & PURIFICATION SYSTEM - 8 TC SURGING - 16 FUEL PUMP - 38 SUPERCHARGING Question No: 1 With respect to Impulse Type Turbo-charging, identify the wrong statement. This uses the pressure pulse wave to expand the gas further at the turbine nozzles and blades. Exhaust gas from each cylinder is lead in to the turbine inlet, after groupping. The pulses or pressure waves are created when the exhaust valve suddenly opens and the exhaust is blown into the exhaust piping of smaller diameter, thereby pressurizing it. For maximum usage of the pulse, the pulse should be as close to the turbine inlet as possible. Question No: 2 In constant pressure turbocharger if exhaust manifold is too big then longer time would be required for the desired exhaust pressure rise.  TRUE FALSE N/A N/A Question No: 3 With respect to efficient Impulse Type Turbo-charging requirements, identify the wrong statement. needs rapid opening of the exhaust valve. Exhaust pipe diameter should be larger , but much smaller than the exhaust valve opening, to allow for creation of pulses. Exhaust piping should be as far as possible to the turbine inlet to use the pulse effectively as well as prevent any pulse reflection. Exhaust grouping is necessary to prevent blow back of one cylinder into another. Question No: 4 With respect to Turbo-charging - Constant Pressure, of I. C. Engines, (identify the wrong statement), The exhaust manifold space is made smaller in volume to prevent any pressure rise. Hence, constant pressure is available to the turbine. However, the manifold should not be too big as then longer time would be required for the desired exhaust pressure rise. The exhaust gas flow creates eddies which dampen out pressure waves or pulses. Question No: 5 With respect to Turbo-charger surging reasons, identify the wrong statement. Restriction and fouling in the air/gas system. Malfunction of the fuel system Rnnning engine at low speed. Rapid variations in engine load. Question No: 6 turbo charger surging (Stalling) takes place due to restriction and fouling in the air/gas system malfunction of the fuel system  rapid variation in engine load any or all of these Question No: 7 You have to reduce turbocharger RPM while carrying out turbine side water washing TRUE FALSE N/A N/A Question No: 8 This energy in exhaust gases is used to drive a gas turbine which in turn drives centrifugal compressor mounted on same shaft. Such an arrangement is called as turbocharger and this type of more efficient supercharging is called as turbo-charging. TRUE FALSE N/A N/A Question No: 9 A naturally aspirated diesel engine at full throttle will have an intake manifold pressure slightly less than atmospheric pressure approximately equal to exhaust manifold pressure at all times that is widely fluctuating constantly decreasing as engine load increases Question No: 10 Remedies for turbocharger surging are Reduce engine speed which Dirty or fouled components to be checked and cleaned Regular gas and air side washing of turbocharger All previous statements are correct Question No: 11 Advantages of Supercharging are  Power is increased for the same engine dimensions and piston speed. Initial costs are reduced, since a more powerful engine can have smaller size, space and mass Fuel consumption reduces as mechanical efficiency increases. All previous statements are correct Question No: 12 Supercharging means increasing the mass of air getting into the engine cylinder TRUE FALSE N/A N/A Question No: 13 In impulse type turbocharging for maximum usage of the pulse, the pulse can be away from the turbine inlet. TRUE FALSE N/A N/A Question No: 14 With respect to efficient Impulse Type Turbo-charging requirements, identify the wrong statement. Exhaust piping should be as near as possible to the turbine inlet to use the pulse effectively as well as prevent any pulse reflection. Exhaust grouping is necessary to prevent blow back of one cylinder into another. Each exhaust pipe has a separate inlet to the turbine. E.g: three cylinders coupled to one turbine with a firing interval of 120 deg crank difference. Has bad response to load changes. Widely used in propultion engines. Question No: 15 In impulse type turbocharging A rapid opening of the exhaust valve is required Exhaust piping of a large diameter, but much smaller than the exhaust valve opening, to allow for creation of pulses  Exhaust piping to be as near as possible to the turbine inlet to use the pulse effectively as well as prevent any pulse reflections All previous statements are correct Question No: 16 With respect to Turbo-charger routine cleaning, identify the right statement. Turbine side cleaning is carried out monthly by opening turbine side. Turbine side cleaning is carried out during major overhaulling of turbo charger. Turbine side water washing is carried out weekly at reduced engine speed. Turbine side water washing is carried out at full engine speed. Question No: 17 With respect to advantages / disadvantages of Supercharging for I. C. Engines, (identify the wrong statement), Power is increased for the same engine dimensions and piston speed. There is no appreciable increase in cylinder maximum pressure. Initial costs are increased, for more powerful engine with smaller size, space and mass. Better cylinder operating conditions. Question No: 18 With respect to Turbo-charger routine cleaning, identify the right statement. Turbine side water washing is carried out generally weekly by reducing engine speed to reduce exhaust temperature and prevent thermal shock to turbine. Turbine side water washing is carried out generally weekly at full engine speed to get high exhaust temperature to remove the soot from turbine blades easily. Once exhaust temperature reaches to recomended limits, exhaust side drain is opened and water admitted slowly to turbine. Washing is carried out till water issuing from drain is clear. Then water supply is cut off, drain shut and engine speed increased gradually. Question No: 19 the difference between water washing and dry cleaning the TC turbine is there is no difference one is wet, the other is dry wet washing requires reduced load  dry cleaning requires reduced load none of the above Question No: 20 With respect to advantages / disadvantages of Supercharging for I. C. Engines, (identify the wrong statement), Power is increased for the same engine dimensions and piston speed. But there is great increase in cylinder maximum pressure. Initial costs are reduced, since a more powerful engine can have smaller size, space and mass. Better cylinder operating conditions. Question No: 21 disadvantage of constant pressure turbo charging for diesel engine is low supply of combustion air at all loads poor response at low loads poor response at higher load all of the above Question No: 22 With respect to efficient Impulse Type Turbo-charging requirements, identify the wrong statement. Exhaust piping should be as near as possible to the turbine inlet to use the pulse effectively as well as prevent any pulse reflection. Exhaust grouping is necessary to prevent blow back of one cylinder into another. Each exhaust pipe has a separate inlet to the turbine. E.g: three cylinders coupled to one turbine (grouped as 1,2,3 & 4,5,6). Has good response to load changes. Widely used in auxiliary power generation where load changes are frequent and longer periods of low load operation is common. Question No: 23 With respect to Turbo-charger surging, identify the wrong statement. It is a phenomenon that effects centrifugal compressors when the mass flow rate of air falls below a sustainable level for a given pressure ratio. Surging may also occur in heavy weather when the propeller comes out of water and the governor shuts the fuel off almost instantaneously. This can also occur at crash stop or other abrupt manoeuvring.  However, continuous surging does not have any adverse effects. Question No: 24 With respect to Constant Pressure Turbo charging ? Advantages & Disadvantages, identify the wrong statement. Can use long stroke engine to its advantage as more time available for expansion. Hence, greater use of heat energy in cylinder. Can cope up with part or low loads. Hence, does not need auxiliary blower. Since exhaust energy not in pressure pulse, more energy available for recovery at the turbine and compressor. Hence, compressor output increased. Greater utilization of waste energy because engine runs at a higher load most of the time. Question No: 25 With respect to Constant Pressure Turbo charging ? Advantages & Disadvantages, identify the wrong statement. More efficient. Turbine operation is better when constant pressure is available at the turbine inlet. Better scavenging possible at higher loads. Exhaust-grouping is required. Question No: 26 Supercharging means increasing the volume of air getting into the engine cylinder TRUE FALSE N/A N/A Question No: 27 Turbocharger surging may occurs in heavy weather at crash stop due toabrupt manoeuvring. All previous statements are correct Question No: 28 With respect to advantages / disadvantages of Supercharging for I. C. Engines, (identify the wrong statement), Fuel consumption increases but mechanical efficiency increases. Cooling is improved since a greater mass of fresh air is supplied. Better utilization of waste exhaust gas energy which can be used to drive the turbocharger. Initial costs are reduced, since a more powerful engine can have smaller size, space and mass. Question No: 29 With respect to Supercharging of I. C. Engines, (identify the wrong statement), Supercharging is the pressure of air supplied to the cylinder at the beginning of compression. Hence, supercharging or pressure charging of the combustion air supplied allows more power to be developed with proper combustion. For supercharging air can be supplied to the cylinder, from main air compressor. A suitable compressor is fitted between air intake and cylinder to get supercharging. Question No: 30 In IC engines proper combustion requires a proper air fuel ratio of 14 : 1 1:14 5 : 11 5 : 15 Question No: 31 Impulse type turbocharging works effectively even at low loads. TRUE FALSE N/A N/A Question No: 32 Turbocharger surging occurs when the mass flow rate of air falls below a sustainable level for a given pressure ratio TRUE FALSE  N/A N/A Question No: 33 With respect to Turbo-charger routine cleaning, identify the wrong statement. Blower side water washing is carried out without reducing engine speed. Blower side water washing is carried out after reducing engine speed. Water sprayed through nozzle removes dust, soot and oil mist deposits on blower side by impingement of water droplets on impeller. Impingement of water droplets on rotor blades, also removes sodium salts. This method is not equally effective in removing carbon deposits. Question No: 34 With respect to Turbo-charging - Constant Pressure, of I. C. Engines, (identify the wrong statement), exhaust gas from each cylinder is led to a common exhaust manifold exhaust gas is supplied to the turbocharger at a `constant pressure?. Smaller exhaust manifold space makes the constant pressure available to the turbine. However, the manifold should not be too big as then longer time would be required for the desired exhaust pressure rise. Question No: 35 With respect to Supercharging of I. C. Engines, (identify the wrong statement), Combustion and power developed, depends upon a proper air fuel ratio of 1:14. The amount of fuel to be burnt is limited by the ratio of air can be supplied. If we can increase the mass of air, i.e. density and pressure, we can use more fuel for burning. A naturally aspirated engine draws air of the same density as is available in ambient atmosphere. Question No: 36 With respect to efficient Impulse Type Turbo-charging requirements, identify the wrong statement. needs rapid opening of the exhaust valve. Exhaust pipe diameter should be smaller, but much larger than the exhaust valve opening, to allow for creation of pulses. Exhaust piping should be as near as possible to the turbine inlet to use the pulse effectively as well as prevent any pulse reflection. Exhaust grouping is necessary to prevent blow back of one cylinder into another. Question No: 37 You have to reduce turbocharger RPM while carrying out blower side water washing TRUE FALSE N/A N/A Question No: 38 With respect to Turbo-charging - Constant Pressure, of I. C. Engines, identify the wrong statement. The exhaust manifold space is large enough for the volume of combined gases without any pressure rise. The exhaust gas flow creates eddies which dampen out pressure waves or pulses. Work is done when the exhaust gases flow into the large manifold through the exhaust valve. Work is done when the exhaust gases expand through the turbine nozzle and blades. Question No: 39 Constant pressure turbocharging gives very slow response to load changes TRUE FALSE N/A N/A Question No: 40 In constant pressure turbocharger work is done when The exhaust gases flow into the large manifold through the exhaust valve. The exhaust gases expand through the turbine nozzle and blades The exhaust gases flows out of the turbocharger casing All previous statements are correct Question No: 41 Which are the mechanical methods of supercharging Rotary air blower driven by engine crankshaft Scavenge pumps reciprocating, engine driven  Under-piston scavenging using piston spaces to pump air All previous statements are correct Question No: 42 In constant pressure turbocharger the exhaust gas flow creates eddies which dampen out pressure waves or pulses. TRUE FALSE N/A N/A Question No: 43 In impulse type turbocharging Utilizes the high kinetic energy of the exhaust gas, unutilized energy from the combustion cylinder. Has good response to load chang Widely used in auxiliary power generation where load changes are frequent and longer periods of low load operation is common All previous statements are correct Question No: 44 disadvantage of constant pressure turbo charging for diesel engine is low supply of combustion air at all loads poor response at low loads poor response at higher load all of the above Question No: 45 In impulse type turbocharging pulses or pressure waves are created when the exhaust valve suddenly opens and the exhaust is blown into the exhaust piping of smaller diameter, thereby pressurizing it TRUE FALSE N/A N/A Question No: 46 The efficiancy of supercharging system is increased by Fitting a two system in series Fitting a modern bearings to the rotating shaft Fitting a charge air cooler after the compressor Fitting a two system in parallel Question No: 47 pulse pressure turbocharging is preferred in diesel engines used for main propelson engine electricity/ power generation emergency power generation does not matter Question No: 48 All the power required to operate the turbochargers is being recovered from waste heat in the exhaust gases TRUE FALSE N/A N/A Question No: 49 With respect to Turbo-charger surging, identify the wrong statement. It is a phenomenon that effects centrifugal compressors when the mass flow rate of air falls below a sustainable level for a given pressure ratio. Surging may also occur in heavy weather when the propeller comes out of water and the governor shuts the fuel off almost instantaneously. This can also occur at crash stop or other abrupt manoeuvring. However, continuous surging does not have any adverse effects. Question No: 50 Difference between water washing and dry cleaning of the TC turbine side is there is no difference one is wet, the other is dry  that wet washing requires reduced load that dry cleaning requires reduced load none of the above Question No: 51 With respect to Supercharging of I. C. Engines, (identify the wrong statement), The amount of fuel to be burnt is limited by the ratio of air that can be supplied. If we can increase the volume of air, i.e. quantity, we can use more fuel for burning. The density of air drawn inside the cylinder determines the quantity of fuel that can be effectively burned per working stroke of a cylinder. A naturally aspirated engine draws air of the same density as is available in ambient atmosphere. Question No: 52 With respect to Impulse Type Turbo-charging, identify the wrong statement. Exhaust gas from each cylinder is lead directly to the turbine inlet. The pulses or pressure waves are created when the exhaust valve suddenly opens and the exhaust is blown into the exhaust piping of smaller diameter, thereby pressurizing it. Work is done by the exhaust gas expanding further at the turbine nozzle and blades. Does not works effectively at low loads. Question No: 53 In constant pressure turbocharger exhaust gas from each cylinder is led to a common exhaust manifold TRUE FALSE N/A N/A Question No: 54 Advantages of constant pressure turbocharging are Exhaust-grouping not required Can use long stroke engine to its advantage as more time available for expansion. Greater utilization of waste energy because engine runs at a higher load most of the time All previous statements are correct Question No: 55 To increase the quantity of fuel burned in the engine we need to The thermal efficiency to be controlled Increase the mass of the air entering in the system Increase the RPM of the engine All previous statements are correct CYLINDER HEAD Question No: 1 Tappet clearance to be adjusted when the engine at normal running temperatures When engine at engine room temperature with cooling water close When engine at engine room temperature with cooling water open None of the previous statements are correct Question No: 2 With respect to Exhaust Valve of 2 stroke I. C. Engines, (identify the wrong statement), Valve stems sometimes coated with chrome. Actual seat area having Stellite to improve life via better wear and damage resistant properties. Brass bush is fitted onto body to act as guide for valve spindle. Nimonic used extensively for valve spindle as wear and corrosion resistance at elevated temps. Question No: 3 With respect to cylinder head defects of I. C. Engines, identify the wrong statement; cracks may occur due to thermal changes in cooling water temp; cracks may occur due to sudden overloading , over heating of engine, cracks may occur due to uneven or incorrect tightening of studs. cracks may occur due to cooling water space fouling. Question No: 4 High pressure lube oil / fuel pipes are sheathed to To avoid any durt entering into the syatem To avoid leak from the pipe directly spraying on hot surface To prvent undue vibration of the pipe To give additional strength to the pipe Question No: 5 Temp inside cylinder rises to 2000 deg C during combustion. drops to 600 deg C during expansion TRUE FALSE N/A N/A Question No: 6 Purpose of Indicator Valve is to allows connecting the cylinder to a indicator instrument which is used to assess the engine performance. vent the inside space of the cylinder when stopped. When starting engine, for blowing through procedure  All previous statements are correct Question No: 7 With respect to cylinder head defects of I. C. Engines, identify the wrong statement; cracks may occur due to thermal changes in cooling water temp; cracks may occur due to sudden overloading , over heating of engine, cracks may occur due to uneven or incorrect tightening of studs. cracks may occur due to cooling water space fouling. Question No: 8 The meaning of lapping a valve and valve seat is:. Adjust the overlapping of the inlet and exhaust valves. Grind the valve against the valve seat to obtain a uniform sealing surface. Machining the valve in a lathe machine. Repair by welding. Question No: 9 Too great a tappet clearance will reduce valve lift, will reduce the duration of opening will increase mechanical noise All previous statements are correct Question No: 10 Cooling the intake air supplied to a diesel engine will reduce mean effective pressure decrease average compression pressure decrease air charge density increase power output Question No: 11 With respect to Exhaust Valve of 2 stroke I. C. Engines, (identify the wrong statement), Valve and seat detached, ground in special rig using a grinding stone of approved quality. Actual seat area having Stellite to improve life via better wear and damage resistant properties.  Bronze bush is fitted onto body to act as guide for valve spindle. High carbon steel used extensively for valve spindle as wear and corrosion resistance at elevated temps. Question No: 12 With respect to Exhaust Valve of 2 stroke I. C. Engines, (identify the wrong statement), Valves of caged type are water cooled. Valve cage must form gas tight seal with cover. Valves usually made form cast iron as not subjected to any excessive mechanical or thermal loading. Valve seat is made of molybdenum steel - thermal and corrossion resistent Valve seat is made of stainless steel - corrossion resistent Question No: 13 With respect to Leaky Exhaust Valve of 2 stroke I. C. Engines, (identify the wrong statement), will causes low exhaust temperature and increased smoke. Compression pressure and P. Max. Will reduce. will causes high exhaust temperature and increased smoke. Turbocharger may surge. Question No: 14 Purpose of cylinderhead is to cover for the cylinder liner and block. seal combustion chamber from top sustains dynamic thermal and mechanical loads caused by combustion pressure and temp. All previous statements are correct Question No: 15 If relief valve lifts in service this indicates Malfunction of relief valve Incorrect condition inside the cylinder Blocked passages Incorrect cooling water temperatures Question No: 16 With respect to I. C. Engines, cylinder head indicator valve is provided to, (identify the wrong statement),  to indicate the piston position at TDC. to vent the inside space of the cylinder when stopped, When starting engine, for blowing through procedure, to allow connecting the cylinder to a indicator instrument which is used to assess the engine performance. Question No: 17 With respect to I. C. Engines, cylinder head relief valve is provided to, (identify the wrong statement), to protect against internal pressure, to protect against excessive internal load on the top end bearing. to discharge directed away from personnel. to protect against excessive internal pressure, Question No: 18 With respect to 4-stroke cylinder head rocker arm of I. C. Engines, identify the wrong statement; proper adjustment to be made to provide clearance between valve stem and rocker arm when engine is cold. As engine attains normal running temp, this clearance will be taken up by expansion. Too little will prevent valve form closing correctly. Too great a clearance on the other hand will increase the valve lift, Question No: 19 Now a days most of the 2 stroke ME Exhaust valve opens by Hydraulic pressure Mechanically operated pressure Pnumatic pressure Electrically driven motor Question No: 20 Relief valve is set to lift not more than 20% above max designed pressure. TRUE FALSE N/A N/A Question No: 21 With respect to I. C. Engines, identify the wrong statement; temp inside cylinder rises to 2000 during combustion & drops to 600 deg. C. during expansion. cooling is necessary to preserve strength of parts and keep oil film in cylinder. cooling water flows in from top of liner either directly thro? self-sealed connections or thro? connecting pipes. vent arrangement are provided to removal air. Question No: 22 Now a days most of the 2 stroke ME Exhaust valve closes by Hydraulic pressure Mechanically operated pressure Pnumatic pressure Electrically driven motor Question No: 23 The 2 stroke ME Exhaust valve rotates during the operation TRUE FALSE N/A N/A Question No: 24 With respect to 4-stroke cylinder head of I. C. Engines, identify the wrong statement; it acommodates exhaust valve at centre,. for too large valves, strength of the cylinder head will be compromised. It is easier to cool a smaller valve. smaller moving parts and springs reduce the inertia and power demand on the engine. Question No: 25 With respect to 4-stroke cylinder head rocker arm of I. C. Engines, identify the wrong statement; push rods and rocker gear are used to open and shut the valves at the correct time. Push rods also operate the fuel injuction pump, push rods are mechanically timed to the crankshaft,  the rocker gear must operate both valves simultaneously. Question No: 26 Increasing the valve clearance between a valve stem and rocker arm, will result in the valve closing later opening sooner staying open for a shorter period of time staying open for a longer period of time Question No: 27 Which is defect of a cylinder head cracks due thermal changes in cooling water temp; sudden overloading/heating of engine, uneven or incorrect tightening of studs. cooling water space fouling due poor water treatment, scale or sludge deposits. corrosion on lower side which exposed to combustion chamber All previous statements are correct CYLINDER LINER Question No: 1 W.r.t. IC Engine Cylinder liners lubrication; (find the wrong one) adequate lubrication in order to reduce piston ring friction and wear is required. The oil film also acts as a gas seal between the liner and rings and as a corrosion inhibitor. In large crosshead type engines separate cylinder lubrication is required in measured quantity of oil to each cylinder. In large crosshead type engines cylinder lubrication is ensured with crank case oil to each cylinder. Question No: 2 W.r.t. IC Engine Cylinder Lubrication, for large crosshead type engines; (find the wrong one)  Ideally lubricators should be timed to inject oil between the top two piston rings as they pass. However this is difficult to achieve and out of phase timing may cause a great loss of oil being swept out of the system. Mechanical lubricators are operated automatically before starting engine to ensure lines are primed and to wet the liner and rings which may be dry. ` The oil supply should be increased during running-in periods for new cylinder liner or piston rings. Mechanical lubricators should be operated by hand before starting engine to ensure lines are primed and to wet the liner and rings which may be dry. ` Question No: 3 W.r.t. IC Engine liner material; (find the wright answer) Cast Iron is used. Cast Iron with molybdenum, vanadium, copper and titanium is used. Cast Iron with alloys of nickel, chromium, molybdenum, vanadium, copper and titanium is used. Cast Iron with alloys of nickel, chromium, and titanium is used. Question No: 4 The factors that govern the maximum possible diameter of the cylinder are The maximum working pressure within the cylinder. The strength of the cyl. liner material. Must be sufficient to keep the hoop stress within acceptable limits The thickness of the cyl. liner governs the rate of heat flow from the hot side of liner to the cooling water All previous statements are correct Question No: 5 W.r.t. IC Engine, the factors that govern the maximum possible diameter of the cylinder are: The maximum working pressure within the cylinder. The strength of the cyl. liner material. Must be sufficient to keep the hoop stress within acceptable limits. The thickness of the cyl. liner which governs the rate of heat flow from the hot side of liner to the cooling water. The type of fuel used. Question No: 6 W.r.t. IC Engine liner material, Cast Iron is choosen because of its ; (find the wrong one)  high tensile strength; refined grain structure with inclusion of alloys; smooth sliding surface due to graphic content for improved lubrication; porous surface which retains oil as well as exposes a fresh surface in case of scuffing or scoring; and wear and corrosion resistance. Question No: 7 The large marine engine liner and cylinder block (cooling water jacket) are casted separately, mainly due to; (find the wrong answer) Differential thermal expansion of liner as compared to jacket. Possibility of using same material, to reduce cost. Cheaper to renew individual parts. Possibility of renewing only liner with wearable part. Question No: 8 The factors that govern the maximum possible diameter of the cylinder are: The maximum working pressure within the cylinder. The strength of the cyl. liner material. Must be sufficient to keep the hoop stress within acceptable limits. The thickness of the cyl. liner which governs the rate of heat flow from the hot side of liner to the cooling water. The type of fuel used. Question No: 9 The purpose of the running-in is essentially a deliberate wear process to establish a quicker sealing between the liner and rings. TRUE FALSE N/A N/A Question No: 10 These are the main reasons for cylinder liner wear Frictional wear Tensional wear  Longitudinal wear All previous statements are correct Question No: 11 W.r.t. IC Engine areas of Cylinder Lubrication difficulty, for large crosshead type engines; (find the wrong one) At the end of compression stroke and beginning of expansion stroke, near TDC the conditions are worse from the point of view of lubrication. Piston rings tend to pump oil by virtue of its sliding velocity, but near TDC piston velocity is low. Excess supply of oil has no adverse effects. Also oil accumulation in scavenge space and carbon deposits on exhaust side will increase. Question No: 12 W.r.t. IC Engine Cylinder Lubrication, for large crosshead type engines; (find the wrong one) The quills pass through the cooling water space and to be sealed adequately. The vertical position of these points will depend upon the engine design. The lubricating points should be with in the combustion space, to ensure perfect lubrication. Distribution of oil around the liner is aided by oil gutters from the lubrication points angled downwards to assist gravity. Question No: 13 Wich is the most un worn part of the cylinder liner At mid length Below the scavenge ports Near the quill area Just after the TDC Question No: 14 In case of large marine engines, both the liner and cylinder block (cooling water jacket) are cast separately. TRUE FALSE N/A N/A Question No: 15 W.r.t. IC Engine areas of Cylinder Lubrication difficulty, for large crosshead type engines; (find the wrong one)  Piston rings operate mostly under boundary or thin film lubrication. In 2 stroke engines there is no non-working stroke during which oil film on liner wall can be re-formed at moderate pressures and temperatures. At the end of compression stroke and beginning of expansion stroke, near TDC the conditions are worse from the point of view of lubrication. Piston rings tend to pump oil by virtue of its sliding velocity, but near TDC piston velocity is high. Question No: 16 W.r.t. IC Engine Cylinder Lubrication, for large crosshead type engines; (find the wrong one) Oil is injected through a number of holes drilled in the liner, usually six to eight, displaced circumferentially around the liner at a chosen vertical position within the piston stroke. Oil is supplied by pressure pulse by mechanical lubricators driven by the engine crank shaft and regulated to deliver at the required rate. Oil is supplied by pressure pulse by mechanical lubricators driven by the engine camshaft and regulated to deliver at the required rate. Lubricator quills are connected to the oil holes, these contain non-return valves to prevent hot gases from the cylinder blowing back from the system. Question No: 17 Which lube oil is suitable to use for cylinder oil lubrication Acidic Alkaline Neutral Semi acidic Question No: 18 W.r.t. IC Engine Cylinder liners lubrication; (find the wrong one) adequate lubrication in order to reduce piston ring friction and wear is required. Special high alkaline cylinder oils are used when burning heavy fuel oils. Special high alkaline cylinder oils are used when burning heavy fuel oils. Cylinder Oil recovered from drains can be reused. Question No: 19 For a cylinder liner material cast Iron is chosen because of  Its high strength; refined grain structure with inclusion of alloys Smooth sliding surface due to graphite content for improved lubrication Porous surface which retains oily as well as exposes a fresh surface in case of scuffing or scoring All previous statements are correct Question No: 20 Excess supply of cylinder lube oil can result in Increased carbon deposits on piston crown and piston rings Oil accumulation in scavenge space will increase Carbon deposits on exhaust side will increase. All previous statements are correct Question No: 21 W.r.t. IC Engine Cylinder liners lubrication; (find the wrong one) In large crosshead type engines separate cylinder lubrication system is fitted to supply a measured quantity of oil to each cylinder. The oil film also acts as a gas seal between the liner and rings and as a corrosion inhibitor. In large crosshead type engines manual cylinder lubrication is fitted which supplies a measured quantity of oil to each cylinder. Special high alkaline cylinder oils are used when burning heavy fuel oils. Question No: 22 W.r.t. IC Engine areas of Cylinder Lubrication difficulty, for large crosshead type engines; (find the wrong one) Piston rings operate mostly under boundary or thin film lubrication. In 2 stroke engines there is no non-working stroke during which oil film on liner wall can be re-formed at moderate pressures and temperatures. At the end of exhaust stroke and beginning of expansion stroke, near TDC the conditions are worse from the point of view of lubrication. Piston rings tend to pump oil by virtue of its sliding velocity, but near TDC piston velocity is low.  Con Rod & X-head Question No: 1 Bottom-end bearing bolts are discarded after completed designated running hours (16000- 24000 hrs). TRUE FALSE N/A N/A Question No: 2 W.r.t. IC Engine connectting rod, (find the wrong one) it connects top-end bearing (gudgeon pin bearing) to bottom end (big end) bearing in trunk-piston engine it is highly stressed component, under purely high tensile force. its purpose to convert reciprocating motion of piston to rotary motion of shaft. it is highly stressed component, under purely high compressive force. Question No: 3 W.r.t. IC Engine connectting rod bolts; (find the wrong one) Con-rod bolts shall be inspected after completing 16000-24000 hrs. Con-rod bolts must be hammer tightened to stated torque with torque spanner. Con-rod bolts shall be discarded after completing designated running hours of 8000-12000 hrs). Con-rod bolts shall be Inspected if piston seizure, over-speed failure, mechanical damage takes place. Question No: 4 W.r.t. large crosshead type I.C. Engine Cross Head Guide; (find the wrong one) It guides the Cross Head Guide shoe, Absolves the piston?s side thrust, Absolves the piston?s forward & aft thrust. Shims are placed between Guide rails & guide plates for adjustments, Question No: 5 Inspection of the Bottom-end bearing bolts includes  Sound testing to detect internal flaws and cracks Measuring elongation of bolts Checking pretension of bolts All previous statements are correct Question No: 6 W.r.t. large crosshead type I.C. Engine Cross Head Bearing; (find the wrong one) Like main bearing motion is steady at high sliding speeds. Cyclic unidirectional combined gas and inertia load acting in downwards direction. Hence, bottom half more prone to wear due tendency to squeeze oil film out during bottom stroke. With increase in bore and mep, loads now extreme. Question No: 7 Diameter of the rest of shank area to be biger than threaded root portion to ensure greater stresses at shank rather than at threaded portion TRUE FALSE N/A N/A Question No: 8 W.r.t. IC Engine connectting rod bolts; (find the wrong one) bottom-end bolts to be checked for reduction in hight, during decarb, to ensure they are not subjected to tensile forcer during operation. Con-rod bolts must be hammer tightened to stated torque with torque spanner. Con-rod bolts shall be discarded after completing designated running hours (16000-24000 hrs). Con-rod bolts shall be Inspected if piston seizure, over-speed failure, mechanical damage takes place. Question No: 9 In correct pre-tension most important cause of fatigue failure TRUE FALSE  N/A N/A Question No: 10 W.r.t. large crosshead type I.C. Engine Cross Head Bearing; (find the wrong one) No difficulty to lubricate. Unlike main bearing, motion is only oscillatory even at high sliding speeds. Cyclic unidirectional combined gas and inertia load acting in downwards direction. Hence, bottom half more prone to wear due tendency to squeeze oil film out during bottom stroke. Question No: 11 Forces acting on big end bolts and brgs Constant fluctuating inertia loads from reciprocating parts swinging in whip motion Shear force tending to separate the two halves Tensile load caused by centrifugal forces of the masses All previous statements are correct Question No: 12 W.r.t. large crosshead type I.C. Engine Cross Head Guide; (find the wrong one) It absolves the piston?s side thrust, Piston?s side thrust direction alters between compression & expansion stroke, Piston?s side thrust direction alters between Ahed & Astern direction. Piston?s side thrust direction alters between Ahed & Astern stroke. Question No: 13 In trunk piston engine top end bearings is bush type TRUE FALSE N/A N/A Question No: 14 Bottom-end bearing bolts checked for elongation at threads during decarb. Tightened to stated torque with torque spanner.  TRUE FALSE N/A N/A Question No: 15 Connecting Rod bearing of 2 stroke engine are of split type, that is two halves each for small and big end brgs. TRUE FALSE N/A N/A Question No: 16 W.r.t. large crosshead type I.C. Engine Cross Head Bearing; (find the wrong one) Difficult to lubricate Unlike main brg motion here only oscillatory at high sliding speeds. Cyclic unidirectional combined gas and inertia load acting in downwards direction. Hence, top half more prone to wear due tendency to squeeze oil film out during bottom stroke. Question No: 17 Connecting rod connects cross head with Gudgeon pin Crank pin Journal Cam shaft Question No: 18 In trunk piston engine both end bearings split TRUE FALSE N/A N/A Question No: 19 Purpose to convert reciprocating motion of piston to rotary motion of shaft TRUE FALSE N/A N/A Fuel injector Question No: 1 The size, position and orientation of the injector nozzle has no function of creating a fine atomized spray with good penetration. TRUE FALSE N/A N/A Question No: 2 In case of fuel injector what keeps needle valve pressed on its seat inside the nozzle A spring adjusting screw Spring Intermediate spindle A spring loaded intermediate spindle Question No: 3 What is affecting combustion Combustion chamber & piston crown design Scavenge Air pressure, temperature & its quality Exhaust gas back pressure All of the previous statements is correct Question No: 4 Fuel injector should  as a non-return valve not allowing combustion gases back into the fuel system not open till a pre-set pressure is built up The valve opening should be prompt to prevent pressure drop through throttling, during the opening process All of the previous statements is correct Question No: 5 Fuel injector should inject and disperse the fuel evenly into the engine cylinder in a finely atomized spray TRUE FALSE N/A N/A Question No: 6 In case of fuel injector, lower surface of valve body and top surface of nozzle are highly polished and lapped to form Corrosion free joint Oil tight joint Surface free from acid attack To achieve a perfect timings Question No: 7 When the fuel pump pressure cuts off the valve closes sharply under the force of compression spring and fuel injection is cut off without dribbling TRUE FALSE N/A N/A Question No: 8 Which is the fault found in fuel injector Carbon Trumpets Wrong Spring Pressure  Too much cooling All of the previous statements is correct Question No: 9 What is not affecting combustion Swirl Turbulance Fuel distribution Frame design Question No: 10 In case of fuel injector, one can exchange needle valve and needle guide as required TRUE FALSE N/A N/A Question No: 11 Injection of the fuel is best or optimum if injection is done immediately after maximum combustion pressure is achieved and injection supply is very rapid at this point. TRUE FALSE N/A N/A Question No: 12 What is not affecting combustion Atomisation Penetration Compression ratio Under piston volume Question No: 13 A fuel injector is spring loaded non-return needle valve is operated by a fuel pressure wave generated by fuel pump and fuel at high pressure is discharged through nozzle. TRUE  FALSE N/A N/A Question No: 14 In case of fuel injector the needle valve is opened by pressure wave from the pump acting on the annulus formed at the end of the valve spindle TRUE FALSE N/A N/A Question No: 15 In some modern engines heavy oil is kept circulating through fuel valve (up to the tip of the needle valve ) when it is not injecting fuel. TRUE FALSE N/A N/A Question No: 16 In case of fuel injector the position of nozzle w.r.t injector body is located by a Circlip Dowel pin Split pin Pinching screw  CAMSHAFT & DRIVE Question No: 1 With respect to I.C. Engine, Crank shafts, find the wrong statement. Increasing diameter of the crankpin allows for reduction in length without reducing bottom end bearing area. The parts forming the crankshaft are the journals, crank webs, the crankpins. Balanced weights are fitted to the webs to balance inertia forces of rotating and gyrating masses. crank angle for the angular arrangement of each crank with respect to the other, depends on the number of strokes only. Question No: 2 For two stroke engine, cam shaft rotates;  at its independent speed. at the half the speed as that of the crankshaft. at the same speed as that of the crankshaft. at the double speed as that of the crankshaft. Question No: 3 ?For four stroke engine; cam shaft rotation has no relation with the crank shaft speed, cam shaft rotates at the half the speed as that of the crankshaft. cam shaft rotates at the same speed as that of the crankshaft. cam shaft rotates at the double speed as that of the crankshaft. Question No: 4 Cam shaft is not used to actuate exhaust valves High temperature alarm cylinder lubricator Air distributer Question No: 5 For four stroke engine cam shaft rotates at half the speed TRUE FALSE N/A N/A Question No: 6 It is important for chains to be correctly tensioned to avoid damage to cam shaft bearings TRUE FALSE N/A N/A Question No: 7 Long free lengths of the chain are guided by rubber clad guide bars to avoid vibration and back lash TRUE FALSE N/A N/A Question No: 8 W.r.t. IC Engine cam shaft drive chain stretch; has no effect, nothing to do. tension needs to be checked & adjusted periodically, as the timing gets effected. Chain needs to be changed. tension needs to be checked & adjusted periodically, to prevent damage to cam shaft. Question No: 9 Chain `stretch? will cause Damage to sprocket wheels Crank shaft bearings Camshaft bearings Incorrect timing Question No: 10 With respect to Misalignment of the main bearings of I.C. Engines, find the wrong statement. leads to cyclic opening and closing of the crank throw, causing in-plane bending and tangential bending stresses. Misalignment can be caused by wear or distortion of the bedplate. Worn main bearings can not be determined by taking crank shaft deflection. Misalignment can be caused by excessive bending of the engine frame work e.g. grounding or incorrect cargo distribution. BEARINGS Question No: 1 In cross head bearings, bottom half more prone to wear due tendency to squeeze oil film out during bottom stroke. TRUE FALSE N/A N/A Question No: 2 Bearings are required to Float journal so that there is no metal contact To transmit load via the lubricant To reduce rotational friction All previous statements are correct Question No: 3 Tin based white metal bearing material constitutes Tin, Antimony and copper and chromium Tin, Antimony and copper and cadmium Tin, Antimony and copper and calcium Tin, copper and cadmium Question No: 4 With respect to White Metal Bearings (find the wrong one), Anti friction, tin-based, white metal, called Babbitt. Tin - 88 % ; soft to allow small changes in alignment between brg and journal. Led ? 8 % ; hard wear resistant to absorb and transmit load. Copper ? 4 % ; to segregate and hold antimony cubes in the tin matrix. Question No: 5 Which is not the required property of the bearing Tensile and compressive strength Non-corrosive by lubricants Not allow abrasive particles to get embedded into it.  Should build up ahesive oil film under boundary lubrication Question No: 6 What is the % of the tin in the material compostion of the white metal 93 72 88 81 Question No: 7 Bearings are used to support the journal TRUE FALSE N/A N/A Question No: 8 Which are the causes of bearing failure Abrasive wear due to fine scoring by hard particles and impurities in lube oils. Corrosive wear due to acidic lubes oil. Erosive wear due to cavitation. All previous statements are correct Question No: 9 With respect to reasons for Bearing Failures, identify the wrong statement; Fatigue failure - leads to cracks at areas of stress concentration. Incorrect clearances or incorrect tensioning of bolts. Overheating due to more supply of oil, misalignment, incorrect clearances, even load distribution, poor surface finish and overloading. Overheating due to poor lubrication supply or contaminated oil, misalignment, incorrect clearances, uneven load distribution, poor surface finish and overloading. Question No: 10 Main bearing supports cam shaft  Crank shaft Propeller shaft Push rods Question No: 11 With respect to White Metal Bearings (find the wrong one), These are anti friction, copper based, white metal, called Babbitt. Tin - 88 % ; soft to allow small changes in alignment between brg and journal. Antimony ? 8 % ; hard wear resistant to absorb and transmit load. Copper ? 4 % ; to segregate and hold antimony cubes in the tin matrix. Question No: 12 Longitudinal grooves of the bearing shell never extend to the end TRUE FALSE N/A N/A Question No: 13 In 4 stroke engines only bottom end bearings are split type TRUE FALSE N/A N/A PISTON,GLAND & RINGS Question No: 1 Function of piston ring is Provide a seal to combustion chamber and prevent gases and combustion products passing the pi Regulate lubricating oil consumption of engine. Conduct heat away from the piston to the liner. All previous statements are correct Question No: 2 Identify the wrong answer; W.r.t. IC Engine, water as piston cooling media, Can remove more heat than lubricating oil. Leakage into crankcase can contaminate the lubricating oil. contains hardness salts which could form scale on the internal surfaces of the piston. Internal stress is generally less in due to lower thermal conductivity Question No: 3 With respect I. C. Engine, Forged steel as piston material is; suitable due to directional grain flow, strong & tough component, prone to high wear at the ring grooves, does not require greater degree of machining. suitable due to directional grain flow, strong & tough component, high wear resistent at the ring grooves, requires a greater degree of machining. not suitable due to directional grain flow, strong & tough component, prone to high wear at the ring grooves, requires a greater degree of machining. suitable due to directional grain flow, strong & tough component, prone to high wear at the ring grooves, requires a greater degree of machining. Question No: 4 W.r.t. IC Engine piston ring material, Identify the wrong answer; ; Ordinary grey cast iron with large amount of graphite in its structure has good wear resistance and self lubricating property. A large amount of graphite increases the strength. Alloyed cast iron has finer grained structure and good graphite formation. Alloyed cast iron elements are: Molybdenum, Nickel and Copper or Vanadium and Copper. Question No: 5 The main properties considered while selecting materials for I. C. Engine piston are; Strength at maximum operating temperatures,Maximum Hardness, Low Thermal conductivity, High Co- efficient of expansion, Ability to resist corrosion, Strength at lower operating temperatures, Maximum Hardness, Low Thermal conductivity, Low Co-efficient of expansion, Ability to resist corrosion, Strength at maximum operating temperatures, Low Hardness, High Thermal conductivity, Low Co- efficient of expansion, Ability to resist corrosion, Strength at maximum operating temperatures, Good Hardness, Low Thermal conductivity, High Co-efficient of expansion, Ability to corrosion, Question No: 6 Identify the wrong answer; W.r.t. IC Engine, oil as piston cooling media, Larger quantity of L.O. ? higher oxidation (acidification to oil). Increased period of cooling required after shutting down to prevent carbonisation of the oil. Higher chances of crank case explosion. Internal stress is generally less in oil cooled pistons due to lower thermal conductivity Question No: 7 Which is the defects noticed in piston ring Flutter Excess Wear Jammed or sticking piston rings All previous statements are correct Question No: 8 Find the wrong answer; In I.C. Engines, w.r.t. piston ring properties, these shall have ; Self lubricating. Ablity to polish the liner. Great resistance to high temperatures. Must at all times retain its tension to give a good gas seal. Question No: 9 Identify the wrong answer; W.r.t. IC Engine, water as piston cooling media, Can remove more heat than lubricating oil. Relatively easy and cheaper to obtain. No need for special storage facility. Can not operate at higher temperatures. Question No: 10 Cast Iron for piston material; Weak in tension at elevated temperatures, High compressive strength, Performs well when exposed to rubbing. Higher tensile strength at elevated temperatures, High compressive strength at lower temperature, Performs well when exposed to rubbing.  Weak in tension at elevated temperatures, High compressive strength, Performs poor when exposed to rubbing. Weak in tension at elevated temperatures, Low compressive strength, Performs well, when exposed to rubbing. Question No: 11 Identify the wrong answer; W.r.t. IC Engine, oil as piston cooling media, System can be combined with the main lube system. Thus, system is simplified. Internal stress is generally higher in oil cooled pistons due to higher thermal conductivity. No risk of crankcase contamination. removes less heat than water. Question No: 12 Identify the wrong answer; W.r.t. IC Engine, water as piston cooling media, Removes less heat than lubricating oil. Relatively easy and cheaper to obtain. No need for special storage facility. Can operate at higher temperatures. Question No: 13 With respect I. C. Engine piston, disadvantages of Aluminum alloy; (find wrong one) High thermal expansion (almost twice that of cast iron) The mechanical properties are lowered as temperature goes high. Has higher strength. The reduction in strength is considerable above metal temperature of 250 Deg.C. Question No: 14 With respect I. C. Engine piston, disadvantages of Aluminum alloy; (find wrong one) High thermal expansion (almost twice that of cast iron) The mechanical properties are lowered as temperature goes high. Has higher strength. The reduction in strength is considerable above metal temperature of 250 Deg.C. Question No: 15 Identify the wrong answer; W.r.t. IC Engine, water as piston cooling media,  Removes less heat than lubricating oil. Relatively easy and cheaper to obtain. No need for special storage facility. Can operate at higher temperatures. Question No: 16 Which is not the material of piston ring Ordinary grey cast iron Alloyed cast iron Spheroidal Graphitic Iron Wrought iron Question No: 17 The piston rings are hammered on which surface to give them required outward spring (self tension) so that they exert a pressure on the cylinder wall when placed inside the cylinder. Outside surface of circumference Top surface of circumference Inside surface of circumference Bottom surface of circumference Question No: 18 In case of trunk piston type of engines pistons are fitted with compression rings as well as oil control rings. TRUE FALSE N/A N/A Question No: 19 Identify the wrong answer; W.r.t. IC Engine, piston ring material material ; Spheroidal Graphitic Iron, very good wear resistance but not as self lubricating as the ordinary grey cast iron. Spheroidal Graphitic Iron is very good wear resistant and also has better self lubricating property then ordinary grey cast iron. Piston rings are usually given a protective coating, e.g. chromed or aluminised, etc to improve running-in.  Piston rings are often contoured to assist in the establishment of a hydrodynamic lubricating oil film and to reduce liner wear. Question No: 20 With respect I. C. Engine, Aluminum Alloy as piston material has; poor strength, light weight, high thermal conductivity, anti corrosive. good strength, light weight, high thermal conductivity, anti corrosive. good strength, light weight, low thermal conductivity, anti corrosive. good strength, light weight, high thermal conductivity, corrosive. Question No: 21 4-stroke engine will have to transmit only half the heat as a 2-stroke engine of similar bore, stroke and speed TRUE FALSE N/A N/A Question No: 22 With respect I. C. Engine, Cast Steel as piston material; poor heat stresses resistant than cast iron, poor flow at the time of casting in intricate moulds. resists heat stresses better than cast iron, poor flow at the time of casting in intricate moulds. resists heat stresses better than cast iron, better flow at the time of casting in intricate moulds. heat stresses resistance inferior than cast iron, good flow at the time of casting in intricate moulds Question No: 23 In crosshead type engines the oil scraper rings are fitted in piston rod stuffing box TRUE FALSE N/A N/A Question No: 24 In I.C. Engines, the purpose of Compression ring, identify the wrong answer; to seal the gases above the piston and prevent leakage of gases below the piston.  to transfer a large portion of the heat from the piston to the cylinder liner. to prevent combustion product from passing down to liner. to prevent oil entering in to combustion space Question No: 25 Identify the wrong answer; The function of piston rings is to, Provide a seal to combustion chamber and prevent gases and combustion products passing the piston. Regulate lubricating oil consumption of engine. allow the use of a separate special oil for cylinder lubrication, Conduct heat away from the piston to the liner. Question No: 26 Identify the wrong answer; In large crosshead type diesel engine a diaphragm is fitted to; isolate the lower end of the cylinder from the crankcase. prevent contamination of the crankcase lube oil, allow the use of a separate special oil for cylinder lubrication, to provide better crank case breathing. Question No: 27 With respect to I.C. Engine piston crown, Identify the wrong answer;. Piston crowns shape either convex or concave than flat. Flat surfaces are not self supporting if subjected to pressure on one side, as it occurs when the piston is loaded. crown of the piston also forms the lower part of the combustion chamber. The shape of the combustion chember has no contribution in fuel injector spray pattern. Question No: 28 The piston rod scraper box incorporated in a single acting two-stroke/cycle, crosshead diesel engine serves to eliminate the necessity for an oil scraper ring prevent side thrust and cylinder scoring prevent sludge and dirty oil from entering the crankcase scrape oil and carbon deposits off the cylinder walls Question No: 29 With respect to I.C. Engine piston crown, Identify the wrong answer;.  Modern pistons are made of composite components, made from materials that exhibit suitable properties. Piston Crowns which are highly stressed mechanically and thermally made from cast or forged steel. Piston Skirts made from Cast steel with superior rubbing properties. To reduce weight and reduce inertia loads, aluminum is used in some medium speed 4-stroke applications. Question No: 30 Identify the wrong answer;. Modern pistons are made of composite components, made from materials that exhibit suitable properties. Piston Crowns which are highly stressed mechanically and thermally made from cast iron. Piston Skirts made from Cast Iron with superior rubbing properties. To reduce weight and reduce inertia loads, aluminum is used in some medium speed 4-stroke applications. Question No: 31 Identify the wrong answer; W.r.t. IC Engine, oil as piston cooling media, System can be combined with the main lube system. Thus, system is simplified. Internal stress is generally less in oil cooled pistons due to lower thermal conductivity. No risk of crankcase contamination. Can remove more heat than water. Question No: 32 Identify the wrong answer; W.r.t. IC Engine, oil as piston cooling media, Larger quantity of L.O. ? lower oxidation (acidification to oil). Increased period of cooling required after shutting down to prevent carbonisation of the oil. No risk of crankcase contamination. Internal stress is generally less in oil cooled pistons due to lower thermal conductivity Question No: 33 Which is not the property of piston ring Great resistance to high temperatures. Must at all times retain its tension to give a good gas seal.  Great resistance to high temperatures Poor resistance to wear and corrosion. Question No: 34 With respect I. C. Engine, Forged steel as piston material is; suitable due to directional grain flow, strong & tough component, prone to high wear at the ring grooves, does not require greater degree of machining. suitable due to directional grain flow, strong & tough component, high wear resistent at the ring grooves, requires a greater degree of machining. not suitable due to directional grain flow, strong & tough component, prone to high wear at the ring grooves, requires a greater degree of machining. suitable due to directional grain flow, strong & tough component, prone to high wear at the ring grooves, requires a greater degree of machining. Question No: 35 With respect I. C. Engine, Aluminum Alloy as piston material has; poor strength, light weight, high thermal conductivity, anti corrosive. good strength, light weight, high thermal conductivity, anti corrosive. good strength, light weight, low thermal conductivity, anti corrosive. good strength, light weight, high thermal conductivity, corrosive. Question No: 36 Find the wrong answer; In I.C. Engines, w.r.t. piston ring properties, these shall have ; Good mechanical strength, must not break easily. Be compatible with cylinder liner material. High resistance to wear and corrosion. High expension, to ensure sealing. Question No: 37 The main properties considered while selecting materials for piston are Strength at maximum operating temperatures Thermal conductivity Hardness All previous statements are correct Question No: 38 Identify the wrong answer; W.r.t. IC Engine, oil as piston cooling media, Larger quantity of L.O. ? lower oxidation (acidification to oil). Increased period of cooling required after shutting down to prevent carbonisation of the oil. No risk of crankcase contamination. Internal stress is generally less in oil cooled pistons due to lower thermal conductivity. Question No: 39 Crown of the piston also forms the lower part of the combustion chamber TRUE FALSE N/A N/A SCAVENGING Question No: 1 ME scavenge air temperature is adjusted by controlling the sea water inlet controlling the sea water outlet keeping outlet valve 100% open always. none of above Question No: 2 During scavenging it is not desirable to Intermix of fresh air with exhaust gases  TRUE FALSE N/A N/A Question No: 3 Excessive difference between combustion pressure and compression pressure in a ME cylinder can be due to low scavenge air pressure change in exhaust valve timing burnt exhaust valves all of the above Question No: 4 Which is not a type of scavenging Loop Scavenging Uniflow Scavenging Cross Scavenging Side Scavenging Question No: 5 The scavenge air high temperature set point for 2 stroke ME is 40C 55C 65C 35C Question No: 6 Which engine component increases air density and helps to improve engine operating efficiency? impeller compressor aftercooler exhaust diffuser FUEL LINE & PURIFICATION SYSTEM Question No: 1 The fuel oil rate of throughput for purification is limited to assist efficient separation. TRUE FALSE N/A N/A Question No: 2 In the fuel oil system the provision must also be made to prevent spray of hot oil on hot surfaces TRUE FALSE N/A N/A Question No: 3 During this change over period from H.O. to D.O , the excess oil should be sent to The mixing column or to the H.O service tank The D.O. tank. The overflow tank. The drain tank Question No: 4 The fuel oil system on board ships has to cater to use of heavy oil and also permit use of diesel when need arises. TRUE FALSE N/A N/A Question No: 5 In the fuel oil system there must be arrangements to circulate the heated oil through the system when the engine is stopped, so that  The fuel oil remains hot The engine can remain on heavy oil and yet able to be started when needed The system does not get vapour lock. None of the previous statements is correct Question No: 6 The fuel oil is heated before purification to Max. temp. 98 deg C Max. temp. 95 deg C Max. temp. 100 deg C Max. temp. 80 deg C Question No: 7 To maintain sufficient temperature for desired viscosity at the injectors, the entire fuel system to the engine must be Well lagged Fitted with tracer steam line Well lagged and tracer steam used High pressure pumps are used Question No: 8 Various safety devices must be included in the fuel oil system are Alarms to detect loss of pressure, low oil tank level etc Quick closing valves must be fitted at the tanks to cut-off fuel supply in case of emergency Remote stop buttons must be wired to trip the pumps also in case of emergency All of the previous statements is correct TC Surging Question No: 1 Turbocharger surging, is a phenomenon that affects -----, when the mass flow rate of air falls below a sustainable level for a given pressure ratio Centrifugal Pump  Rotary compressors Centrifugal compressors Reciprokating pump Question No: 2 Regular gas and air side washing of turbocharger will reduce the chances of surging. TRUE FALSE N/A N/A Question No: 3 If turbocharger surging occurs then Reduce engine speed Increase engine speed Stop Engine All of the previous statements Question No: 4 Excess fouling in the system like intake air filter, compressor is not the cause of the turbocharger surging TRUE FALSE N/A N/A Question No: 5 turbo charger surging (Stalling) takes place due to restriction and fouling in the air/gas system  malfunction of the fuel system rapid variation in engine load any or all of these Question No: 6 We have a problem with surging in the turbocharger. Which of the following could be the cause? Worn out bearings on the turbocharger. The lubrication oil pump is malfunctioning. Dirty rotor blades. Dirty scavenging air cooler on the air side. Question No: 7 Turbocharger surging occurs if turbocharge mismatches with the engine TRUE FALSE N/A N/A Question No: 8 Turbocharger surging, happens when the mass flow rate of air falls below a sustainable level for a given pressure ratio TRUE FALSE N/A N/A Question No: 9 With respect to Turbo-charger surging reasons, identify the wrong statement.  Restriction and fouling in the air/gas system. Malfunction of the fuel system Rnnning engine at low speed. Rapid variations in engine load. Question No: 10 Turbocharger surging occurs due to Restriction and fouling in the air/gas system. Malfunction of the fuel system Rapid variations in engine load All of the previous statements Question No: 11 With respect to Turbo-charger surging, identify the wrong statement. It is a phenomenon that effects centrifugal compressors when the mass flow rate of air falls below a sustainable level for a given pressure ratio. Surging may also occur in heavy weather when the propeller comes out of water and the governor shuts the fuel off almost instantaneously. This can also occur at crash stop or other abrupt manoeuvring. However, continuous surging does not have any adverse effects. Question No: 12 Dirty or fouled components is one of the cause of the turbocharger surging TRUE FALSE N/A N/A Question No: 13 Turbocharger surging is also known as Knocking  Stalling Slapping Splashing Question No: 14 Turbocharger surging occurs at Crash stop Heavy weather Sudden load change All of the previous statements Question No: 15 With respect to Turbo-charger surging, identify the wrong statement. It is a phenomenon that effects centrifugal compressors when the mass flow rate of air goes above a sustainable level for a given pressure ratio. Surging may also occur in heavy weather when the propeller comes out of water and the governor shuts the fuel off almost instantaneously. This can also occur at crash stop or other abrupt manoeuvring. However, continuous surging must be avoided, as there is a risk of damaging the rotor, especially the compressor blading. Question No: 16 With respect to Turbo-charger surging reasons, identify the wrong statement. Restriction and fouling in the air/gas system. Malfunction of the fuel system Rnnning engine at low speed. Rapid variations in engine load. Fuel Pump Question No: 1 To overcome the following problems V.I.T was introduced  Latest engines have a high stroke-bore ratio for more power output and run at a lower rpm Modern engines lose too much compression pressure and temperature at low speeds and loads Cheaper highly viscous residual fuels are being used now-a-days have longer ignition delays, All of the previous statements are correct Question No: 2 The quantity of fuel that can be burnt completely in a cylinder depends on Piston speed Stroke of the engine The quantity of air available for combustion Viscosity of the fuel at the injector Question No: 3 In Jerk Type Fuel Injection Pump the end of injection is constant. TRUE FALSE N/A N/A Question No: 4 In Jerk Type Fuel Injection Pump a spring fitted between lower end of plunger and pump body ensures positive contact between cam and roller TRUE FALSE N/A N/A Question No: 5 In valve controlled fuel pumps, VIT is done by raising/lowering the suction and spill valve by changing the position of the eccentrics  TRUE FALSE N/A N/A Question No: 6 Eccentric fulcrums is the specialty valve controlled fuel Injection pump TRUE FALSE N/A N/A Question No: 7 Dribbling of injector may cause Pulses in fuel system Very high exhaust pressure Thick white smoke. Black smoke & carbon deposit on injector. Question No: 8 In valve controlled fuel Injection pump turning the eccentric alters the clearance between end of push rod and valve and holds valve open for longer or shorter duration during the upward stroke of the plunger TRUE FALSE N/A N/A Question No: 9 With the use of VIT  The thermal efficiency and combustion efficiency is improved, while the SFOC is reduced No dark smoky exhaust; less thermal stresses, improved Nox emissions Improved temperature control for preventing corrosion and strength of parts like crankshaft is better utilized All of the previous statements are correct Question No: 10 Common rail system has following advantages High injection pressures (and hence small droplets) can be used at all loads down to idling Engine timing can be varied during running to optimise engine performance which also optimises emissions The design is simpler and eliminates one pump per cylinder principle, the fuel rack control shaft and mechanical governor All of the previous statements are correct Question No: 11 In Jerk Type Fuel Injection Pump when radial bore inside the barrel is in line with spill port Maximum injection takes place Minimum injection takes place No injection takes place Modarate injection takes place Question No: 12 In Jerk Type Fuel Injection Pump to dampen effect of high pressure wave traverses from delivery side to suction side Relief valve is provided Erosion plugs are fitted Dampening piston (spring loaded) are fitted at the end of the suction manifold Bursting disc is provided Question No: 13 In Jerk Type Fuel Injection Pump the distance between top edge of plunger and control edge of helical groove forms the effective stroke. TRUE FALSE N/A N/A Question No: 14 In normal engines, Pmax is achieved only at full load power, whilst in VIT, Pmax is achieved at lower loads. TRUE FALSE N/A N/A Question No: 15 Fuel injuction pump should Jerk the fuel in to the combustion chember Meter accurately the fuel to be delivered in each cylinder Adjust the load of the engine Correct the power developed by the engine Question No: 16 In Jerk Type Fuel Injection Pump to reduce the erosion effect on the suction port Dampening piston (spring loaded) are fitted at the end of the suction manifold Erosion plugs are fitted Bursting disc is provided Relief valve is provided Question No: 17 One function of the fuel pump delivery check valve is to prevent carbon deposits from forming on the injector nozzle help the injector needle reseat without dribbling at the nozzle holes provide a prolonged pressure drop in the high pressure steel piping to the injector ensure a fuel leakoff between the plunger and barrel which provides lubrication for relative movement Question No: 18 In valve controlled fuel Injection pump valves are operated by Remote control Pneumatic system Their respective push rods By solenoid mechanism Question No: 19 In Jerk Type Fuel Injection Pump two helical grooves are cut along the cylindrical face of plunger. They are connected with oil discharge space by a radial and a axial hole drilled in a plunger TRUE FALSE N/A N/A Question No: 20 To open and close fuel injector valve rapidly and promptly To avoiding dribbling of injector To avoid high temperature To avoid high pressure None of the previous statements are correct Question No: 21 Accumulators used In common Rail System serve the purpose of Decreasing the running in period Providing the sufficient volumetric capacity Increasing the total load taking capacity of the engine All of the previous statements is correct Question No: 22 In Jerk Type Fuel Injection Pump the quantity of fuel is injected depeds on rotation of the plunger inside the barrel. FALSE TRUE N/A N/A Question No: 23 When the lower edge of the spiral begins to uncover the release port in a jerk pump, the pumping continues until the plunger travels its full stroke effective pumping stroke of the plunger ends pressure drops slowly until the full stroke is attained plunger rotates to the zero delivery position until the next stroke Question No: 24 Atomisation helps to complete combustion within available period TRUE FALSE N/A N/A Question No: 25 In Jerk Type Fuel Injection Pump a delivery valve assembly comprising of a spring loaded non-return valve is fitted above the barrel landing face. TRUE FALSE N/A N/A Question No: 26 In Jerk Type Fuel Injection Pump the beginning of injection is constant. TRUE FALSE N/A N/A Question No: 27 This causes injector needle valve to lift and fuel injection commences High velocity movement of the plunger High acceleration of the plunger Both statements are correct Both statements are wrong Question No: 28 The Valve controlled fuel Injection pump has beginning of injection is adjustable but once adjusted remains same and does not change with load TRUE FALSE N/A N/A Question No: 29 In Jerk Type Fuel Injection Pump the top edge of helical groove w.r.t spill port forms the controlling edge for fuel regulation. TRUE FALSE N/A N/A Question No: 30 Accumulators used In common Rail System serve the purpose of Dampening pressure fluctuations during quick load changes Decreasing the injection delay Increasing the total load taking capacity of the engine All of the previous statements is correct Question No: 31 In VIT, the injection timing is varied to maintain higher combustion pressures at reduced loads TRUE FALSE N/A N/A Question No: 32 Which is not the basic types of airless injectio