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单选题
If water is found in the crankcase of a diesel engine, the cause may be due to（）
A
a cracked cylinder head
B
a leaky cylinder head gasket
C
a cracked cylinder liner
D
any of the above
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A sudden power loss from a turbocharged and after-cooled diesel engine is an indication of a/anA.turbocharger malfunction or failureB.crankcase exhauster overloadC.overload on the intercoolerD.obstruction in the engine cylinders
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单选题If a diesel engine were running at 20% overload with a smoky exhaust, you should（）A
stop the engine immediately to prevent damageB
increase lube oil pressureC
slow the engine allowing it to gradually coolD
decrease the cooling water it temperature to the water jacket
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单选题Water accumulating in the crankcase of a diesel engine could indicate（）A
a cracked cylinder linerB
excessive water in the fuelC
a leaking intercoolerD
excessive moisture in the scavenge air
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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
check the fuel oil strainersD
clean the fuel system
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单选题Stating a large propulsion diesel engine using diesel fuel during cold weather conditions can be made easier by （）A
increasing the quantity of starting airB
increasing the lube oil pressureC
heating the engine fuel supplyD
heating the engine jacket water
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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Due to excessive water in the fuel, a diesel engine fails to startBefore the engine can be started, the water must be removed from the （）.A
fuel pumpsB
cylindersC
fuel strainersD
all of above
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单选题Why the cooling water of the diesel engine should be treated? Because the（）A
Cooling water is alkalescenceB
cooling water is acidityC
cooling water has salinityD
cooling water has impurity
考题
单选题If a crankcase explosion has occurred in a diesel engine, and the crankcase remains intact, which of following precautions should be observed?（）A
The cylinder indicator cocks should be openedB
The sump lube oil scavenge pump should be secured immediatelyC
The explosion relief valves should be manually openedD
The crankcase should remain unopened until the engine has cooled
考题
单选题Regarding a Diesel engine crankcase, the general arrangement and installation should preclude the possibility of （）A
free entry of air to the crankcaseB
water entering the crankcase while engine wash-downs are being performedC
excessive oil leakage during periods of increased blow-byD
sub-cooling internal components
考题
单选题In a diesel engine, blow-by is a result of combustion gases leaking into the crankcase past the （）A
wrist pin bushingsB
compression ringsC
cylinder liner sealsD
cylinder liner sealing ring
考题
单选题The expansion tank for a diesel engine closed cooling system is designed to maintain a constant head on the system and （）.A
reduce water temperatureB
reduce water turbulenceC
provide an air cushionD
allow for an increase in water volume as the engine warms up
考题
单选题Diesel engine ‘blow-by’ into the crankcase is caused by excessive ring（）A
back clearanceB
side clearanceC
gap clearanceD
taper clearance
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单选题In a diesel engine, blow-by（）A
increase exhaust back pressureB
causes excessive crankcase pressureC
can only be detected by a compression checkD
decreases fuel consumption
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单选题The cooling water of the diesel engine should be treated, because it has（）A
alkale scenceB
acidityC
salinityD
impurity
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单选题In a diesel engine cooling system, the high temperature alarm contact maker will be activated on excessively high water discharge temperature from the （）A
raw water pump dischargeB
expansion tank outletC
cooling water heat exchangerD
outlet engine jacket water outlet
考题
单选题If water is found in the crankcase of a diesel engine, the cause may be due to（）A
a cracked cylinder headB
a leaky cylinder head gasketC
a cracked cylinder linerD
any of the above
考题
单选题If a crankcase explosion occurs in a diesel engine, you should stop the engine and（）A
immediately open all crankcase relief portsB
increase crankcase exhauster speed to draw cool air into the engineC
allow the engine to cool naturallyD
increase crank case scavenge air to remove unburned gases
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单选题A diesel engine crankcase ventilation system （）A
prevents spark generationB
removes combustible gasesC
determines the level of combustible gasesD
provides inert gas generation in crankcase
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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 filledB
there might be a fuel leakC
there might be a water leakD
all of the above
考题
单选题If the jacket water temperature rises rapidly above normal in a diesel engine, you should FIRST （）A
place standby cooler in operationB
reduce engine loadC
check thermostatic valveD
clean sea water strainer
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In a diesel engine cooling water system, a pH of 60 indicates a/an （）.A
slightly acidic conditionB
slightly alkaline conditionC
overtreatment of waterD
neutral condition of water
考题
单选题If a crankcase explosion occurs in a diesel engine, which of the listed actions should be taken?（）A
Open the crankcase immediately to check for damageB
Apply fire fighting water through the crankcase breatherC
Allow the engine to cool before opening the crankcaseD
Assume that there is no damage to the crankshaft
考题
单选题High diesel engine cooling water temperatures can be caused by （）.A
a worn water pumpB
not enough coolantC
air in the cooling systemD
all of the above
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