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单选题
Defective timing gear in a diesel engine may lead to （）.
A
smoky exhaust
B
starting failure
C
overload
D
over speed
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If an auxiliary diesel engine coolant temperature is higher than normal, but the thermostat is determined not to be defective, you would suspect a/anA.cavitation erosion in the water jacketsB.excess corrosion inhibitor in the coolantC.dirty jacket water coolerD.defective turbocharger
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单选题Diesel oil may be used to cool （） of a diesel engine.A
cylindersB
exhaust valvesC
pistonsD
fuel valves
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单选题When transmitted by a reduction gear, diesel engine speed is reduced and the torque available for work （）A
remains the sameB
is reducedC
is increasedD
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单选题Load control on a diesel engine is accomplished by （）.A
regulating the speed of the turbochargerB
rotating the fuel injector pump plungerC
regulating the speed of the fuel oil transfer pumpD
changing engine timing
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单选题A magnetic strainer is used in the diesel engine reduction gear oil system to remove small particles of（）.A
waterB
babbittC
iron or steelD
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单选题Fuels of different qualities may require advancing or retarding the injection timing, in addition to which if the injection timing is advanced when the engine is running at loads below the （）, then a saving in fuel can be achieved.A
BHPB
MCRC
IHPD
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单选题Which of the following may lead to the engine NOT to start on air?（）A
starting air pressure too highB
correct timing of starting air valvesC
three of the six starting valves stuckD
the turning gear disengaged
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单选题Which cause of the following can lead to the engine not to start on air?（）A
starting air pressure too highB
correct timing of starting air valvesC
three of the starting valves stuckD
the turning gear disengaged
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单选题If a single cylinder relief valve on a diesel engine lists frequently while the engine is running, the cause may be an （）A
excessively late injection timing for each cylinderB
incorrectly adjusted intake valve timingC
incorrectly adjusted fuel injectorD
incorrectly adjusted intake valve clearance
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单选题Diesel engine air start valve timing is controlled by（）A
engine operating speedB
an air manifoldC
a hydraulic distributorD
individual cams and valve gear
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单选题To successfully reduce an excessively high diesel engine exhaust gas temperature, you should （）.A
reduce the engine driven fuel pump outlet pressureB
retard the fuel injector timing to reduce powerC
increase the fuel rack settingD
reduce the load on the engine
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单选题If the engine does start on air, but combustion does not immediately begin, the cause may not be （）.A
low compressionB
failure of the fuel pump to discharge fuelC
incorrect timing of fuel pumpD
turning gear being still on
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单选题Defective atomizer in a diesel engine will lead to（）.A
smoky exhaustB
starting failureC
overloadD
over speed
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单选题Defective air cooler in a diesel engine will lead to （）.A
smoky exhaustB
starting failureC
overloadD
over speed
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单选题Defective governor in a diesel engine may lead to （）.A
smoky exhaustB
starting failureC
ignition relayD
over speed
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单选题Connecting rods in a diesel engine are used to connect the （）.A
engine to the bedB
rocker arm to the camshaftC
crankshaft to the gear trainD
piston to the crankshaft
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单选题With Variable Injection Timing the start of injection may be （）as the engine load is reduced.A
advancedB
retardedC
kept constantD
none of the above
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单选题In a two-stroke/cycle diesel engine, the exhaust gases are expelled from the cylinder by the（）A
exhaust manifoldB
valve bridgeC
pressure of the fresh air chargeD
valve adjusting gear
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单选题If an auxiliary diesel engine temperature is higher than normal ,but the thermostat is determined not to be defective you would suspect a /an （）A
cavitation erosion in the water jacketsB
excess corrosion inhibitor in the coolantC
dirty jacket water coolerD
defective turbocharger
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单选题A faulty injection in one cylinder of an operating diesel engine can be located by （）A
cutting out individual injectors and noting engine performanceB
checking lube oil temperatureC
checking cam positionD
using a timing light
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单选题Some medium and high-speed diesel engines require reduction gear units to provide a useful propeller speedIn most reduction gears, the bull gear（）A
must churn the oil in the sumpB
is connected to the propeller shaftC
is driven at the highest RPMD
compensates for alignment variations between the engine and pinion gear
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单选题A defective injector nozzle in a propulsion diesel engine can cause（）A
engine power lossesB
smoking due to unburned fuelC
high exhaust temperature readingsD
all of the above
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单选题Significant retardation of a diesel engine fuel injection timing will result in （）A
smoother engine operationB
advanced fuel ignitionC
increased fuel economyD
reduced engine power
考题
单选题Before engaging the turning gear and turning the diesel engine, which of the following operation should be done except（）A
open the indicator cocksB
supply some CYL Oil to cylinder liner wall with lubricator (only for two stoke diesel engine)C
put the fuel handle in the “stop” positionD
pump up the air bottle
考题
单选题Turbulence in a diesel engine cylinder is of major importance in providing （）.A
proper fuel meteringB
complete fuel/air mixingC
minimal fuel penetrationD
proper fuel timing
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单选题The timing of diesel engine air starting valves is controlled by（）A
the air start valve timing gears and rodsB
a cylinder check valveC
individual cams and valve gearD
an air manifold poppet valve
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