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单选题
Engine coolant accumulating in the diesel engine lubricating oil can result from a （）
A
low oil pressure
B
high coolant pressure
C
leaking fuel injector
D
cracked cylinder head or liner
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单选题Low compression in a diesel engine can be caused by （）A
clogged coolant passagesB
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camshaft seizure
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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
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单选题Black smoke exhausting from an operating diesel engine is an indication of poor combustion which may be caused by （）A
water in the fuelB
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clogged air intake passagesD
burning lubricating oil
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单选题An over-speed trip stops a diesel engine when the engine （）A
runs out of fuelB
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exceeds a set maximum speedD
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单选题The operating diesel generators will have their exhaust temperatures, cooling water and lubricating oil temperatures and pressures （） in much the same way as for the main engine.A
to be keptB
loggedC
changedD
has remained
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单选题As to the low speed diesel engine, if you want to change the coolant flow for a certain cylinder, you can regulate （）.A
the inlet valveB
the outlet valveC
both the inlet valve and the outlet valveD
the pump inlet valve
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单选题If the operating element of a thermostatic valve installed in a diesel engine cooling system malfunctions, it may result in （）A
a low level in the engine expansion tankB
excessively high coolant pressureC
improper temperaturesD
malfunctioning of the jacket water heater
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单选题Starting a large low-speed propulsion diesel engine on diesel fuel during cold weather conditions, will be made easier by （）A
increasing the quantity of starting airB
increasing the lube oil pressureC
heating the engine fuel supplyD
heating the engine coolant
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单选题What is one effect of running a diesel engine at too cool a temperature? （）A
Buildup of sludge in the lubricating systemB
Excessive fuel consumptionC
Severe heat stresses on mechanical partsD
Foaming of the lubricating oil
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单选题Coolant can be lost from a diesel engine jacket cooling waster system by leakage from（）A
cylinder head cracksB
piping jointsC
pump leakingD
all of the above
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单选题If the detergent type lubricating oil being used in a diesel engine is black, the oil （）A
must be centrifugedB
must by filteredC
must be changedD
is holding finely dispersed carbon in suspension
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单选题The oil lubricating diesel engine cylinders usually contain additives formulated to impart a high degree of alkalinity to （） the acid conditions.A
invadeB
provideC
detergentD
neutralize
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单选题In a closed diesel engine freshwater cooling system, the amount of coolant flowing through the heat exchanger is controlled by the （）.A
suction pressure regulatorB
thermostatic bypass valveC
sea water temperatureD
water level in the expansion tank
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单选题Combustion knock occurring in a diesel engine can be caused by （）A
low coolant temperatureB
insufficient fuelC
high ambient temperatureD
carbon buildup on the injector tips
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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
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单选题Lubricating oil viscosity in an operating diesel engine can be reduced by（）A
increasing cooling water flowB
increasing lube oil flowC
dilution by fuel oilD
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单选题One of function of diesel engine lubricating oil is to （）A
induce carbon formation on cylinder wallsB
improve fuel penetration in the combustion spaceC
form a friction reducing film between mating surfacesD
lubricate the fuel injection
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单选题Lubricating oil used in a diesel engine serves to（）A
reduce the wear of bearing surfacesB
cool the bearing surfacesC
assist in sealing bearing surfacesD
all of the above
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单选题Which of the following precautions must be taken if an electric immersion heater is used to keep the coolant in a diesel engine warm during the time the engine is secured?（）A
The coolant temperature must be maintained at 180℃B
The thermostatic bypass valves must be manually opened before the engine is startedC
The pressure cap must be removed while the engine is securedD
Electrical power to the heater must be secured before the cooling system is drained
考题
单选题Lubricating oil systems for diesel engine journal bearings are usually lubricated by which of the following types of lubricating oil systems?（）A
SplashB
GravityC
PressureD
Bypass
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单选题How often should the lubricating oil of a diesel engine be changed?（）A
After every tripB
Every 4000 hoursC
According to manufacturer’s instructionsD
Every time they are shutdown
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