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单选题
A diesel engines crankcase oil level is found to be too high√ You should suspect that （）.
A
the engine was over filled
B
there might be a fuel leak
C
there might be a water leak
D
all of the above
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单选题Before starting a diesel engine, you should always（）A
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单选题An increase in diesel engine crankcase pressure generally indicates excessive（）A
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单选题Heat damage to fuel injection nozzles on small high-speed diesel engines, can be prevented by（）A
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单选题Telescopic pipes to the piston of a large slow-speed main propulsion diesel engine are designed to prevent （）.A
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contamination of the lube oil by waterD
contamination of the cooling water by lube oil
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单选题If the cooling water temperature and the lube oil temperature in a diesel engine are too high, the cause can be （）A
a dirty lube oil strainerB
internal water leaksC
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单选题Sluggish response or action of the hydraulic actuators may be a result of （）.A
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relief-valve pressure setting too highD
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单选题The purpose of an oil mist detector in a main propulsion diesel engine is to warn of （）A
excessive mist density in the crankcasesB
excessively high crankcase vacuumC
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单选题Which of the listed diesel engine operating conditions should be checked immediately after any diesel engine is started?（）A
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单选题What function is provided by the crankcase ventilation system on some diesel engines?（）A
Increases the sludge forming tendency of lube oilB
Prevents the accumulation of combustible gasesC
Improves lube oil coolingD
Improves cold weather starting
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单选题The crankcase of many diesel engines are kept under a slight vacuum by the （）.A
scavenging action of the pistonB
piston type vacuum pump taking suction off a differential manometerC
gland exhausting manometerD
crankcase exhaust fan
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单选题Crankcase explosions in propulsion diesel result from（）A
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单选题In engines with system, the lubricating oil can be added to the engine through the filling hole in the crankcase cover, by using a hand oil can, or through the separator pipe（）A
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compensates for alignment variations between the engine and pinion gear
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单选题How dose water enter the crankcase of a diesel engine?（）A
Through the crankcase exhausterB
As water vapor contained in blow-byC
Demulsifying lube oil passing through the main bearingsD
Condensation from vapor formed in the expansion tank
考题
单选题In a normally operating diesel engine, the main cause of lubricating oil contamination in the crankcase is a result of the （）.A
metal particles loosened by wearB
air when no air cleaners are usedC
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单选题（） providing lubricating films, oil used in marine diesel engines have to remove heat from oil cooled piston.A
Except forB
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ExceptD
In addition to
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单选题If a diesel engines exhaust temperature is abnormally high, the cause could be（）A
too light of a loadB
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overloading of the engineD
too low of a compression ratio
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单选题When the ships is going to enter into the harbor,（）.A
change from diesel oil to heavy fuel oil for mail engineB
pump out bilge waterC
change sea chest form lower level one to high level oneD
test emergency generator
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