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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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Crankcase explosions in propulsion diesel engines result from ____.A.the splashing of lubrication oil by the crankshaftB.the dilution of crankcase oil with particles of combustionC.broken fuel lines spraying oil on the crankcaseD.the ignition of unburned fuel and air in the crankcase
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Immediately after any diesel engine is started, the engineer should check the ______.A.crankcase pressureB.lube oil pressureC.saltwater pressureD.exhaust temperature
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单选题Auxiliary diesel engines can be automatically shut down as a result of （）A
low lube oil temperatureB
low lube oil pressureC
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change from heavy fuel oil to diesel oil for mail engineB
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单选题Before starting a diesel engine, you should always（）A
check the pyrometer readingsB
check the crankcase oil levelC
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单选题An increase in diesel engine crankcase pressure generally indicates excessive（）A
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lube oil header pressureC
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piston ring blow-by
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单选题Heat damage to fuel injection nozzles on small high-speed diesel engines, can be prevented by（）A
employing fuel oil as a cooling mediumB
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ensuring good metallic contact between nozzles and cylinder heads
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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
excessive crankcase pressureB
excessive lube oil temperatureC
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
an oil suction line restrictionD
excessive wears of the cooling water pump
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单选题Sluggish response or action of the hydraulic actuators may be a result of （）.A
insufficient loadB
excessively high oil viscosityC
relief-valve pressure setting too highD
reservoir level being maintained two inches above normal
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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
excessively high bearing temperatureD
excessive carbon buildup in the lube oil
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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
Exhaust temperatureB
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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
the splashing of lubrication oil by the crankshaftB
the dilution of crankcase oil with particles of combustionC
broken fuel lines spraying oil on the crankcaseD
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单选题If fuel injection to a four-stroke/cycle diesel engine begins earlier than designed, ignition may be delayed because the （）.A
cylinder compression pressure may not be high enoughB
cylinder compression temperature may be too highC
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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
lubricating oilB
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circulated tankD
wet sump
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单选题A diesel engine crankcase ventilation system （）A
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removes combustible gasesC
determines the level of combustible gasesD
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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
考题
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
condensation of water vaporsD
breakdown of the lubricating oil by dilution
考题
单选题（） providing lubricating films, oil used in marine diesel engines have to remove heat from oil cooled piston.A
Except forB
BesideC
ExceptD
In addition to
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单选题Diesel engines are started by supplying （） into the cylinders in the appropriate sequence for the required direction.A
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cylinder oil
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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
injection timing is too earlyC
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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