C11 PDF - Propulsion Plant Exam

C11 - OPERATE REMOTE CONTROLS OF PROPULSION PLANT AND ENGINEERING SYSTEMS AND SERVICES 1 89...

C11 - OPERATE REMOTE CONTROLS OF PROPULSION PLANT AND ENGINEERING SYSTEMS AND SERVICES 1 89 89 1. Why is it important to heat up the oil before starting during standstill liquid which may condense in the crankcase or oil separator? GOOD SCORE: 89 OUT OF 89 It should never be done Compressor oil regulating system will operate better. To avoid the compressor oil to disappear from the crankcase during starting. The compressor will run better. 2 2. Can you identify from statement below the most serious effect of trapped air in a diesel engine jacket water cooling system? GOOD It requires the use of an injector It accelerates erosion It requires the use of a fuel/water separators. It requires the use of a day tanks test stand. 3 3. What would be the result on a 2 stroke marine diesel engine if the o-ring for Jacket cooling water sealing is leaking? GOOD The water will leak into the under piston space. the water will come out from the top of cylinder jacket. The water will leak directly into the crankcase. The water will come out through tell-tale hole provided between the two o-ring. 4 4. What is meant by surge limit of a turbocharger? GOOD Portion of compressor characteristic curve which lies on the left side of the point of maximum pressure Maximum rpm limit of T/C above which surging will start Characteristic curve of a turbocharger A line joining all the points of maximum pressure on compressor characteristic curves, drawn at various speeds of operation. 5 5. Select from the following methods is normally used to lubricate bearing in a small highspeed diesel engine? GOOD By sight feed lubricators By mechanical lubricators By splash lubricatin By pressure lubrication 6 6. Which of the following main engine components regulates speed? GOOD telegraph governor fuel rack valve gear 7 7. Can you identify from statement below if it is essential to renew turbocharger bearings after a preset numbner of hours of running even if the bearings are in seemingly perfect condition? GOOD for the reason that the lube oil contamination is bound to occur and affect the condition of the bearings  For the reason that they are prone to failure due to prolonged exposure to high temperature conditions. For the reason that it is not essential to renew if condition monitoring suggest perfect condition. For the reason that they are subject to cyclic loading and are prone to failure due to metal fatique. 8 8. Can you identify the type of lubricating oils generally used in auxiliary engines? GOOD A detergent A synthetic An alkaline A semi-synthetic 9 9. If your vessel burns 4 tons of fuel per hour at 21 knots, how many tons per hour will it burn at 16 knots? GOOD 1.8 tons 2.3 tons 5.3 tons 3.0 tons 10 10. How is the thrust bearing lubricated on this Diesel engine? GOOD Via the camshaft By its own independent supply system. Direct via the main lub oil line. Direct via the lub oil line 11 11. If the timing of the engine is delayed, and the exhaust temperatures are high. Can you identify from the following possible behaviour to affect the turbocharger? GOOD A higher air and gas temperature after turbo charger. A surging of the turbo charger An increased turbo charger revolutions A decreased turbo charger revolutions. 12 12. The pitch of your propeller is 22.25 feet and you have been turning 74 RPM for the last 24 hours. The distance covered by observation from noon to noon was 420 mils. What is the engine distance and the propeller slip? GOOD ED 390 miles / slip 7.7% ED 395 miles / slip 7.7% ED 395 miles / slip 8.0% ED 390 miles / slip 8.0% 13 13. The thermoexpansion-valve is a part of the refrigeration system. What is the thermo-expansion valve doing? GOOD Regulating the cargo hold temperature Regulating the suction pressure Regulating cooling water temperature. Regulating freon liquid flow to the evaporator 14 14. What can you say about the most likely cause of too low suction pressure in a freon compressor? GOOD  Broken suction valve plate Blocked condenser Blocked condenser tubes Too little gas in the system. 15 15. Your vessel arrives in port with sufficient fuel to steam 1175 miles at 19.0 knots. If you are unable to take on bunkers, at what speed must you preceed to reach your next port, 1341 miles distance? GOOD 16.6 knots 18.5 knots 17.8 knots 16.9 knots 16 16. Determine how long would it take for 3 pumps working simultaneously to empty a tank. In one pump, it can empty a tank in 12 hours, another pump can empty the same tank in 4 hours, and another can empty this tank in 9 hours. GOOD 2 hours and 45 minutes 4 hours and 15 minutes 3 hours and 15 minutes 2 hours and 15 minutes 17 17. What can you point out about the effect of excessive tappet clearance in 4 stroke auxiliary engine? GOOD The increased engine efficiency as expansion can take place for a longer duration and less energy wsted with the exhaust gase s. The loss in compression, poor combustion, improper mixing of fuel & air and gas leakage due to improper closing of valve. The valve hammering, change in timing of exhaust with more side thurst causing greater wear between stem and bush. The turbocharger surging, loss of rotation of valve spindle and high exhaust temperatures. 18 18. What conclusion can you captivate on lubricating oil quality with excessively high temperature? GOOD It will cause oxidation which increase viscosity. The oil flashpoint will be changed. It will cause oxidation which reduces viscosity. It will evaporates the oil giving high consumption. 19 19. During a routine check of one of the auxiliary engines in an UMS operated engine room, a minor leakage on a high pressure fuel pipe was observed. Demonstrate the appropriate action and/or precaution to be executed?(Assume normal operation: 2 sets operating) GOOD Have a motorman on watch for the rest of the night, especially instructed to watch the engine. Any of the mentioned alternatives will meet the requirement. Change operation to the third generator set, preparing the original set for repair of the failure and switching to manual mod e until repair is carried out. Change the operation to the third generator set, leaving the orignial set as stand-by awaiting possibility to repair the failure. 20 20. If pitch of propeller is 18 feet, 9 inches, how many revolution it make per minute with 10 percent slip in a vessel steaming at 12 knots? GOOD 72.08 RPM 72.07 RPM 72.06 RPM 72.05 RPM 21 21. What can you say about the safety valve on a steam boiler?  21. What can you say about the safety valve on a steam boiler? GOOD It shall block the spring and the valve so no steam is escaping in the funnel, if the spring on the valve is not working prop erly. It shall be adjusted by the crew when necessary It shall open, when pressure in the boiler is in excess of normal working pressure It shall be used to regulate the steam pressure 22 22. If water contamination occurs in the crankcase oil of an auxiliary engine, what would be the result of the oil viscosity? GOOD It will increase Nothing will happen It will stay at the same It will decrease 23 23. Which one of the following type of tubes used in Air comp cooler GOOD fixed type U type Spring type floating 24 24. Select from the following specifications/qualities of cylinder oils counter corrosive wear? GOOD Specific gravity TBN Viscosity Detergency 25 25. How would you describe the most common cause of the scale formation in an auxiliary boiler? GOOD The improper treatment of the feedwater with calcium sulfate The excessive feedwater alkalinity The concentration of calcium sulfate in boiler water The fuel oil is in the feedwater 26 26. Compute the slip for the voyage if your vessel has turned an average of 90 rpm and has steamed a total distance of 4827 miles in 11 days, 00 hour 30 minutes. The pitch of the propeller is 20.5 feet. GOOD -1.7% 11.8% 1.7% 0% 27 27. How would you describe the intake valves of diesel engines that is fabricated from low-alloy steels? GOOD That the beveled edges of the intake valves provide for self centering during seating That the volume of air passing through intake valves is less than the volume of air passing through exhaust valves That the intake valves utilize stelite-coated valve seat inserts which reduce wear That the intake valves are less affected to the corrosive action of exhaust gases 28 28. Which of the following fuel oil impurities can cause maximum abrasive damage? GOOD Ash Sodium Water Catalytic fines 29 29. If centrifugal pumps cannot handle air and require priming. What ideas justify why the centrifugal pump cannot handle air? GOOD Compressibility Fluidity only Density only Both fluidity and density 30 30. Which of the following is the most common method to achieve the best possible combustion on main engine? GOOD a beam of solid fuel, hitting a warm piston top. allow some of the fuel go to the overflow pipe. an atomization of the fuel injeted into the combustion chamber. a beam of solid fuel hitting the top of the cylinder liner. 31 31. Compute for the engine speed if the vessel is turning 120 RPM and the pitch of the propeller is 10 feet and 9 inches. GOOD 13.47 knots 13.74 knots 12.73 knots 12.47 knots 32 32. Find how many RPM will the shaft have to turn if the speed necessary for reaching port at a designated time is 17.4 knots, assuming a slip of positive 3%. The pitch of propeller is 25.6 feet. GOOD 63 RPM 75 RPM 71 RPM 67 RPM 33 33. You are sailing with 93 RPM, with a propeller pitch of 25 feet, and an estimated slip of 0%. What is the speed of advance? GOOD 13.0 knots 22.9 knots 22.4 knots 14.2 knots 34 34. It has been reported that Engine room bilge pump was unable to take suction form Fwd.(P) bilge well while it is taking suction efficiently form Fwd.(S) & aft bilge wells. Can you identify from the statement below is the most probable cause? GOOD There is leakage in the bilge suction pipeline somewhere between the bilge wells and bilge pump The pump needs to be overhauled The Fwd (P) bilge well suction valve might be leaking  The Fwd (P) bilge well suction filter cover gasket might be leaking 35 35. Which of the following instruments is used to take crankshaft deflection reading? GOOD Bell logger Analogger Data logger Alarm logger 36 36. Proceeding at an average speed of 17.5 knots, a passenger ship consumes 378 tons of F.O. per day. Calculate for the maximum speed the passenger ship can turn for in order to reduce consumption to 194 tons of fuel oil per day. GOOD 14.0 knots 15.5 knots 16.8 knots 12.5 knots 37 37. What evidence can you find on a normal manometer reading of turbocharger air suction filter and normal speed of the turbocharger but reduced scavenge air pressure? GOOD May be due to fouling of the turbine May be due to fouling of diffuser or compressor wheel May be due to fouling of the nozzle ring May be due to cold climate 38 38. Describe the purpose of the inlet grid provided within the exhaust gas casing in the gas flow path, prior entry to turbocharger? GOOD It is used to filter out any unburned cargon It is used to mount the engine frame securely to the hull to prevent sharft coupling misalignment It is used to prevent any broken piston rings finding their way to trubine It is used to stiffen the bedplate in way of the main bearing to increase the engine's longitudinal strength 39 39. How would you classify a deepwell pump GOOD Centrifugal pump Gear pump Screw pump Eductor 40 40. How would you describe the main function of the rods in the construction of large, low speed diesel engines? GOOD It is used to accept most of the tensile loading that results form the firing forces developed during operation It is used to connect the crosshead solidly to the piston rod It is used to stiffen the bedplate in way of the main bearing to increase the engine's longitudinal strength It is used to mount the engine frame securely to the hull to prevent shaft coupling misalignment 41 41. Can you identify from the following bearings below is most widely used for main and connecting rod bearings of medern diesel engines? GOOD Split roller Poured babbit, self aligning  Steel-lined Precision insert 42 42. What can you point out about the engine with tie rods over an engine without tie rods? GOOD That the engine is very easily aligned after any misalignment has taken place between different components of the engine. That the engine components are much lighter leading in overall reduction is engine weight with a high pwer generation with th e elimination of fatigue stersses. That the tie rods require regular maintenance and replacement like connecting rods and overall engine becomes more expensive to operate. That the engine does not require thrust pads for transmission of thrust to the ship's hull as the same is being traken care o f by the tie rods. 43 43. You have steamed 216 miles and consumed 19.0 tons of fuel. If you maintain the same speed, how many tons of fuel will you consume while steaming 315 miles? GOOD 32.3 tons 27.7 tons 28.3 tons 29.7 tons 44 44. What is the ambient temperature for Emergency generators should be capable of being started? GOOD zero, cold starting spray -5, cold starting spray -5 heating arrangements Zero, heating arrangements 45 45. How would you explain a duplex filter unit would be the best arrangement for a continuous operation on a diesel engine? GOOD The clogging will not occur The dropping pressure is half of that through a single filter unit. The changing filter elements would be not interrupt engine operation the filtering occurs twice in each pass of oil through the system. 46 46. How would you explain the result when increasing the rotational speed of a cargo pump? GOOD To pump flow rate will flow the pump flow rate does ot depend upon the speed The pump flow rate will decrease in diret proportion to the increase in speed The pump flow rate will increase in direct proportion to the increase in speed 47 47. Can you identify from the following the type of flow on a modern marine turbochargers compressor? GOOD A mixed flow A turbulent flow A radial flow An axial flow 48 48. What evidence do you think a crank web deflection readings will give a positive indication? GOOD A slack thrust bearings  A worn main bearing journals A torsional stress deformation a bearing shells shim dimensions 49 49. The F.O. transfer pump was working efficiently, but it stopped taking suction suddenly. There is a sounding of 6.0 metersin the F.O. Deep tank. The suction pressure gauge ws renewed recently and is showing a positive pressure when pump is running, but the pump is not transferring any F.O. Can you identify from statement below the most probable GOOD cause? The pump is damaged and needs overhaul the suction filter cover gasket might be leaking The pump suction pipeline is blocked The pump relief valve might be leaking 50 50. Which of the following is a correct point for sampling of system lube oil for on board or shore analysis? GOOD Tank drains Inlet or outlet of L.O. coolers Purifier outlets Standpipes 51 51. A marine boiler burning H.F.O. face a problem of cold corrosion due to high sulphur content. The minimum flue gas temperature within any boiler part is left above dew point of H2SO4. How would you explain where the flue gases rely on? GOOD From the Boiler operating pressure. From the Ambient air temperature From the Boiler furnace temperature. From the HFO sulphur content and moisture in combustion air. 52 52. In a pressure type lubrication system, the lube oil service pump normally takes suction form the sump tank, select form the following it is directly discharge? GOOD to the lube oil cooler To the lube oil header To the gravity feed tank to the main thrust bearing 53 53. How long should a diesel driven pump in full tank capacity could run in full capacity? GOOD Three hours Ten hours Five Hours 15 hours. 54 54. How would be an emergency generator to be capable of being started at an ambient temperature and if lower temperature are expected? GOOD It should be provided with a manual starter. It should be provided with heating arrangement. It should be provided with anti-freeze engine oil. It should be provided with cold starting spray. 55 55. What type of lube oil pump can be used in a diesel engine? GOOD  Gear pump Diaphragm pump Volute pump Centrifugal pump 56 56. What explanation do you have for surge limit of a turbocharger? GOOD The portion of compressor characteristic curver which lies on the left side of the point of maximum pressure. The maximum rpm limit of T/C above which surging will start. The characteristic curve of a turbocharger A line joining all the points of maximum pressure on compressor characteristic curves, drawn at various speeds of operation. 57 57. Identity from the following valve is liable to open or close under pressure of fluid, if not locked in position? GOOD A plug valve A butterfly valve A globe valve A gate valve 58 58. Select from the following the procedure the lubricating oil is heated before entering the purifier? GOOD In order to lower the viscosity and improve purification. In order to boil of water In order to increase the viscosity and improve purification In order to prevent corrosion 59 59. What is the term given to the process of breaking up fuel oil into very fine particles for better combustion? GOOD Atomizing Straining Spraying Settling 60 60. What could be the cause of a surging trouble in the turbocharger GOOD Dirty rotor blades and nozze ring Dirty scavenging air cooler on the air side Worn out bearings on the turbocharger The lubrication oil pump is malfunctioning 61 61. Which one would you choose about lubricating oil having a high viscosity index number is most effective? GOOD Only in very hight temperature installations Over a wide range of temperature variations. As an additive to slow oxidation. As an additive to depress pour point 62 62. If the direction of rotation of a gear pump is reversed due to change in phase sequence, what happens when the pump is started?  62. If the direction of rotation of a gear pump is reversed due to change in phase sequence, what happens when the pump is started? GOOD The direction of flow will be reversed. Pump relief valve will be lifted The pump will get damaged due to overpressure on suction side Direction of the flow remains the same 63 63. What is the best anser to detect a clogged / dirty lube oil filter? GOOD Pressure drop across the filter Decrease in oil viscosity Visual inspection of the filter elements High lube oil temperature 64 64. Which cleaning agents for machinery space are important to use due to the oily water separators function? GOOD An emulsion agent No kind of chemicals Any kind of chemicals A non-emulsifying agent with self spliting emulsifiers 65 65. Can you select from the statement below you would execute prior to starting a cold automatically fired auxiliary boiler? GOOD The blowdown the gauge glass To close the air cock when fires are lighted To check and regulate the water level To crack the steam stop to assure protective steam flow 66 66. What is the long term effecty on lubricating oil quality for excessively high temperature? GOOD It will evaporates the oil giving high consumption It will cause oxidation which reduces viscosity. It will cause oxidation which increase viscosity. The oil flashpoint will be changed. 67 67. Calculate your vessel's speed of advance if you have an estiated slip of +10%, RPM of 70 and with a propeller pitch of 19 feet. GOOD 11.81 knots 13.13 knots 14.44 knots 12.37 knots 68 68. What conclusion can you captivate if proper lubrication of the main bearings is more easily obtained, in a single acting four-stroke/cycle diesel engine, than a single acting two - stroke / cycle diesel engine? GOOD Because the bearing pressure in a two-stroke/cycle single acting diesel engine is continually reversed. Because the two stroke/cycle diesel engines require more complicated lubrication piping Because the bearing pressure in a four-stroke / cycle single acting diesel engine is continually reversed. Because the maximum bearing pressure is higher in a single acting two-stroke/cycle diesel engine. 69 69. What RPM you are require if the pitch of propeller is 19.5 feet and speed required to reach the port at designated time is 13.77 knots and slip expected is 7%? GOOD 76.8 RPM 77 RPM 76.55 RPM 76.94 RPM 70 70. Can you identify from statement below the purpose of an air cooler in a supercharging system? GOOD To reduce temperature of supercharger air in order to condense and remove maximum possible moisture from the air prior entry to the engine. To cool supercharge air to increase its density and also to keep the peak temperature and exhaust gas temperature within limi ts. To reduce the temperature of the supercharged air in order to increase the density & also to cool down below dew point to rem ove moisture from air prior entry to the engine. To cool supercharge air to increase its density such that the dew point is not reached to avoid entry of moisture into the en gine. 71 71. Can you select from the following the effect of the over speeding of the diesel engine driving an electric generator? GOOD It will damge the windings. The low voltage trip to trip The reverse power trip to trip. the excessive exhaust temperatures 72 72. Which of the following would be the correct way of using a torque wrench? GOOD Application of jerk pulls while tightening Adjust the handle and set it at a specific level of torque Using an extension Tightening beyond the characteristic clicking sound 73 73. Demonstrate the procedure on how to warm up a diesel engine that has been idle for sometime? GOOD It should inject either into the air intake It should be run at minimum speed for a period of time It should be run at half speed for a period of time It should be run at top speed immediately 74 74. You have steamed 265 miles and consumed 25.0 tons of fuel. If you maintain the same speed, how many tons of fuel will you consume while steaming 346 miles? GOOD 33.01 tons 35.1 tons 37.4 tons 32.6 tons 75 75. The unit of measure expressed as certistokes(cSt) is a measure of what fuel property? GOOD heating value Cetane rating Density  Viscosity 76 76. What do you think would be the most likely cause of high discharge pressure from a freon compressor? GOOD Broken suction valve plate Too little gas in the system Broken discharge valve plate Blocked condenser 77 77. On an engine room bilge pump has suction manifold on with 3 valves are located. One valve for engine room bilge wells suction, another one for Bilge tank suction and the third one is for sea water suction. It is found that the bilge pump is unable to take suction from any of the bilge wells, but is able to take suction efficiently from bilge tank. What GOOD explanation do you have the most probable cause? Pump suction filter cover gasket leaking Bilge well suction pipeline leaking between individual bilge well valves and suction manifold valve Bilge pump suction pipeline leaking between the manifold and the pump Suction filter cover gasket of one of the Bilge wells is leaking 78 78. Calculate how fast the propeller is turning if its pitch is 21.5 feet. The speed of advance is 22.5 knots with a slip is -1.5%. GOOD 107.7 RPM's 95.4 RPM's 104.5 RPM's 92.2 RPM's 79 79. After replacing the fuel filters, the diesel engine fails to restart. Can you select from the following the probable cause of this condition? GOOD A low compression An air-bound fuel system A change in viscosity An improper spark 80 80. Can you identify from the statement below the purpose of an air cooler in a supercharging system? GOOD It cool supercharged air to increase its density and also to keep the peak temperature and exhaust gas temperature within lim its. It cool supercharge air to increase its density such that the dew point is not reached to avoid entry of moisture into the en gine. It reduce the temperature of the supercharged air in order to increase the density & also to cool down below dew point to rem ove moisture form air prior entry to the engine. It reduce temperature of supercharged air in order to condense and remove maximum possible moisture from the air prior entry to the engine. 81 81. If timimg of the engine is delayed and the exhaust temperatures are high. What conclusion would you expect which will affect the turbocharger? GOOD There will be higher air and gas temperature after turbocharger There will be an increased turbocharger revolutions there will be a decreased turbocharger revolutions There will be a surging on the turbocharger 82 82. What is the best tool to measure the number of threads per inch on a bolt? GOOD tap screw pitch gauge  pair of outside calipers micrometer 83 83. Choose from the following type of corrosion normally occurred in cooling Fresh Water systems of Marine Diesel Engines? GOOD a stress corrosion a bimetallic corrosion a selective Phase corrosion a hot corrosion 84 84. Which one from the following valve is not rotating type? GOOD plug v/v butterfly v/v ball v/v gate v/v 85 85. If overspeed and low lube oil pressure condition contribute to engine shutdown, which form the following condition demonstrate the cause? GOOD High lube oil pressure High jacket water temperature High jacket water pressure Low jacket water pressure 86 86. Can you identify from the following the meaning of the term "valve clearance"? GOOD It is the clearance between the rocker arm and valve pushrod. It is the clearance between vavle spindle disc and seat. It is the clearance between the rocker arm and valve pushrod in either warm or cold state. It is the clearance between the rocker arm and campshaft pushrod. 87 87. How would you explain the presence of catalytic fines in fuel oil which is significant to engineers on board? GOOD Because the catalytic fines tend to impair proper operation of purifiers Because the catalytic fines necessitate increase in storage temperature Because the catalytic fines lead to abrassive wear in liners, piston rings and fuel injection equipment Because the catalytic fines necessitate increase in injection temperature 88 88. A vessel's propeller has a pitch of 16 feet and a 10 percent slip. Calculate the amount of revolution per minute must she turn up to arrive the ship at 10 knots? GOOD 70.57 RPM 70.47 RPM 70.27 RPM 70.37 RPM 89 89. Your vessel consumed 20 tons of fuel when traveling 155 miles. How much fuel will she consume travelling 352 miles? GOOD 44.42 tons 45.32 tons 44.32 tons 45.42 tons