EC5 Assessment Questionnaires PDF - Engine

UNIVERSITY OF CEBU‐METC STO COMPETENCY 5 ASSESSMENT QUESTIONNAIRES FOR VALIDATION ‐ ENGINE 1 The ability of lubricating oil to resist viscosity changes during temperature changes is indicated by the________. A viscosity index number B American Petroleum Institute number...

UNIVERSITY OF CEBU‐METC STO COMPETENCY 5 ASSESSMENT QUESTIONNAIRES FOR VALIDATION ‐ ENGINE 1 The ability of lubricating oil to resist viscosity changes during temperature changes is indicated by the________. A viscosity index number B American Petroleum Institute number C Seconds Saybolt Furol number D Seconds Saybolt Universal number 2 If the capacity of a centrifugal pump decreases gradually over a long period of time, you should replace the _____. A wear rings B packing gland C mechanical seals D lantern rings 3 When securing a distillate pump on a low pressure fresh water evaporator, which of the listed steps should be carried out first? A Trip the three‐way solenoid dump valve B Stop the pump C Close the pressure gage valves D Close the sealing line valves to the pump 4 A hydraulic system gear pump being fed from a reservoir frequently indicates signs of excessive pitting after two months of service. Which of the following would most likely contribute to this condition? A A vacuum condition has developed in the reservoir B Abnormal pressurization is occurring in the reservoir C A partial restriction in the return line has developed D Operating oil temperature is determined to be below normal 5 The minimum delivery pressure required for diesel engine fuel oil injection depends primarily on the ___________. A firing pressure in the engine B degree of cylinder air turbulence C compression ratio of the engine D duration of the combustion period 6 Fuel oil penetration into the cylinder of a diesel engine is ___________. A reduced by finer atomization B dependent on fuel injection cut‐off C increase by finer atomization D nonexistent in the precombustion chamber system Page 1 of 7  7 Which of the following precautions should be observed concerning the introduction of a fire resistant fluid into a hydraulic system? A Deterioration of paints, seals, metals, and electrical insulation may occur. B Fluid viscosity always increases as a normal result of its use. C Decreased wear rates of components is an advantage of its use. D Only chemically active filters may be used. 8 A good quality oil used in main propulsion engine lubrication systems should be _____________. A resistant to permanent emulsification B free from all chemical additives C quickly chemically oxidized D readily saponified with water 9 Fuel supplied by each unit injector on a two‐stroke/cycle single acting diesel engine is directed into each cylinder at a very high pressure through the ___________. A spray tip of the injector B high pressure fuel line C spill deflector D check valve 10 Very small irregularities on the seat and disk of a globe valve may be manually repaired with the valve in place by the process known as _____________. A lapping in B honing C refacing D spotting in 11 When assembling a run of liquid service piping, which of the following factors should be considered? I. How the type of fittings used will affect the flow II. What type of gasket material should be used III. What radius should be used for each bend in the A I, II & III B I only C I & II D II & III 12 The injection pressure of a hydraulic fuel injection nozzle can be increased by _______. A increasing compression on the pressure spring B increasing fuel oil booster pump pressure C increasing the injector nozzle orifice size D removing shims from under the nozzle spring 13 Zinc anodes are installed in a marine raw‐water cooling system to _____________. A control electrolysis B inhibit oxidation C prevent scaling D eliminate corrosion Page 2 of 7 14 To correctly identifies the position of the journal when the shaft is ______. A just beginning to rotate B just at the moment prior to being stopped C increasing its speed to required operating speed D operating at its normal operating speed 15 A hydraulic system gear pump being fed from a reservoir frequently indicates signs of excessive pitting after two months of service. Which of the following would most likely contribute to this condition? A A vacuum condition has developed in the reservoir B Abnormal pressurization is occurring in the reservoir C A partial restriction in the return line has developed D Operating oil temperature is determined to be below normal 16 The minimum delivery pressure required for diesel engine fuel oil injection depends primarily on the ___________. A firing pressure in the engine B degree of cylinder air turbulence C compression ratio of the engine D duration of the combustion period 17 Fuel oil penetration into the cylinder of a diesel engine is ___________. A reduced by finer atomization B dependent on fuel injection cut‐off C increase by finer atomization D nonexistent in the precombustion chamber system 18 Which of the following precautions should be observed concerning the introduction of a fire resistant fluid into a hydraulic system? A Deterioration of paints, seals, metals, and electrical insulation may occur. B Fluid viscosity always increases as a normal result of its use. C Decreased wear rates of components is an advantage of its use. D Only chemically active filters may be used. 19 A good quality oil used in main propulsion engine lubrication systems should be _____________. A resistant to permanent emulsification B free from all chemical additives C quickly chemically oxidized D readily saponified with water 20 Fuel supplied by each unit injector on a two‐stroke/cycle single acting diesel engine is directed into each cylinder at a very high pressure through the ___________. A spray tip of the injector B high pressure fuel line C spill deflector D check valve Page 3 of 7 21 Very small irregularities on the seat and disk of a globe valve may be manually repaired with the valve in place by the process known as _____________. A lapping in B honing C refacing D spotting in 22 The injection pressure of a hydraulic fuel injection nozzle can be increased by _______. A increasing compression on the pressure spring B increasing fuel oil booster pump pressure C increasing the injector nozzle orifice size D removing shims from under the nozzle spring 23 Zinc anodes are installed in a marine raw‐water cooling system to _____________. A control electrolysis B inhibit oxidation C prevent scaling D eliminate corrosion 24 Main propulsion engine lube oil sumps should be constructed _________. A with a sloped bottom B so as to never be integral with the main engine foundation C only of nonferrous, noncorrosive metals D with drain/return lines terminating just above or at the designed normal level 25 The amount of fuel injected into a diesel engine cylinder by a unit injector, is controlled by ___________. A a metering helix inside the pump B the firing pressure in the cylinder C varying the physical length of the plunger stroke D varying the clearance between the injector cam and the injector rocker arm 26 Gate valves should not be used for throttling as __________. A wire drawing of the disc will result B the pressure drop will be excessive C air binding will develop D the installation of an equalizing line will be necessary 27 If the chemical analysis of a lube oil sample taken from the main propulsion machinery indicates an increased neutralization number the _______. A acidity has increased B viscosity has decreased C demulsibility has improved D foaming is guaranteed to occur Page 4 of 7 28 Assuming oil and water flow rates remain the same, what would be the effect of scale formation occurring on the inside of the cooling water tubes of a lube oil heat exchanger? A water temperature outlet temperature will decrease and the lube oil temperature will increase B water temperature outlet temperature will decrease and the lube oil temperature will decrease C water temperature outlet temperature will increase and the lube oil temperature will decrease D water temperature outlet temperature will increase and the lube oil temperature will increase 29 The combustible element in fuel that could cause major air pollution is _______. A sulphur B hydrogen C nitrogen D carbon 30 The viscosity of fuel oil is indicated by its____________. A internal friction B weight C demulsibility D S.A.E. number 31 The final heating of the feedwater in a flash type distilling plant is carried out by______. A low pressure steam admitted to the feedwater heater B heat exchange in the first‐ stage feedbox C vaporization in the first‐ stage flash chamber D heat exchange in each stage distiller condenser 32 Which of the listed conditions can lead to cavitation in a centrifugal pump? A Vapor pockets formed in the suction flow stream. B Rough casing volute surfaces. C Worn wearing rings. D Heavy fluid in the flow stream. 33 If you attempt to tighten a leaking hydraulic fitting with pressure on the system, you will _____. A find that the pressure will prevent the components from being tightened B be successful every time C cause the system to vibrate D dislodge any scale in the tubing, and it will damage the system 34 To correctly identifies the position of the journal when the shaft is ______. A just beginning to rotate B just at the moment prior to being stopped C increasing its speed to required operating speed D operating at its normal operating speed 35 Tube scaling in heat exchangers causes the heat transfer rate to decrease because the _____. A thermal conductivity of the scale is very low B surface area of the tube decreases C cooling fluid outlet temperature decreases D flow through the heat exchanger becomes more turbulent Page 5 of 7 36 While the oily‐water seperator is operating in the processing mode, if a low vacuum, what is the probable cause? A The coalescer beads are severely fouled. B The bilge suction is completely flooded. C The flow control valve 14 is completely open. D There is minor air leakage into the separator. 37 The harmful effect of sulfur present in the boiler fuel oil is that it ___________. A forms corrosive acids when mixed with water B causes excessive smoke and soot when firing at low rates C does not readily burn when mixed with oxygen D frequently clogs fuel strainers 38 What do next after adding grease to a ball bearing with a hand held grease gun? A Run the machine with the bearing housing drain plug open for a short while B Close the bearing housing drain and add a little extra grease to compensate for air pockets in the bearing C Remove the grease fitting and leave open to allow excess grease to escape D Save the used grease for chemical analysis 39 What happen when you heat the oil? A It makes the oil less viscous B It makes the oil extremely viscous C It makes the oil frictionless D It makes the oil difficult to transfer 40 What instrument or process determines the BTU value of boiler fuel oil? A Calorimeter B Open cup test C Hydrometer D Viscosimeter 41 Greases are generally produced by ____. A saponifying a metal base, to which oil is then added and mixed under controlled temperature B reducing the temperature of an oil below its cloud point to create the gelatinous texture C reducing tallow 50 degrees Fahrenheit below its pour point then mixing a base metal, such as barium, into solution D saponifying an aluminium base, to which tallow and oil mixed into solution under a controlled temperature 42 If one of the bilge system manifold valves does not properly seat, the__________. A bilge system will lose vacuum and prevents the other bilges from being pumped out B bilge well aft connected to that valve will siphon its contents to the forward bilge wells C bilge well connected to that valve, plus the second bilge well being pumped will be completely emptied D all of the above Page 6 of 7 43 When securing a centrifugal type distillate pump, which of the listed steps should be carried out first? A Trip the three way dump valve. B Close the pressure gage isolation valves. C Secure the casing vapor vent line. D Secure the stuffing box sealing water line. 44 Which of the following statements represents the proper relative direction of flow through a globe valve? A Direction of flow should be from below the seat. B Direction of flow through the valve is unimportant. C Direction of flow through the valve depends upon the type of seat design used in the valve. D Direction of flow should be from above the seat. 45 In a two stage flash evaporator, heated feedwater is vaporized in the_________. A first and second stage flash chambers B distiller feedwater heater C first and second stage vapor separators D feed inlet box 46 In a centrifugal pumps operating with a high suction lift, foot valves are primarily designed to______.. A enable the pump and its suction line to remain primed prior to starting the pump B give the pump motor, or driver, positive protection when operating in a shutoff condition C provide a means of supplying sealing fluid for the impeller shaft stuffing box D afford the pumping system protection against water hammer and surging 47 Which of the following centrifugal pump components converts the liquid velocity to pressure? A Volute B Impeller C Electric motor D Eye 48 An oil fog lubrication system is recommended for______. A high speed continuous operation of roller bearings B low and moderate speed ball bearings C heavily loaded and high‐ speed ball bearings D gear shaft bearings 49 The first step when beginning to set the slide valves on a duplex reciprocating pump is to _____. A center the steam piston in the cylinders B open the relief valve to prevent accidental starting C ensure the balance piston is on the downstroke D measure the present port openings to ensure reassembly will be the same 50 If you are operating a centrifugal water service pump with worn wear rings, the____. A pump discharge capacity is reduced B pump would be very noisy C pump would vibrate excessively D stuffing box would leak excessively Page 7 of 7