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单选题
Low compression of diesel engine may result from （）
A
a worn cylinder
B
broken piston rings
C
any of A and B
D
none of the above
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Which of the following reasons represents why the designed compression ratio of a gasoline engine is lower than that of a diesel engine?A.compression must be low for effective spark ignitionB.compression must be low for required horsepower and torque generationC.compression must be low to prevent pre-ignitionD.compression must be low to have effective pre-ignition
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If fuel injection to a four-stroke/cycle diesel engine begins earlier than designed, ignition may be delayed because theA.cylinder compression pressure may not be high enoughB.cylinder compression temperature may be too highC.fuel oil injection pressure may not be high enoughD.scavenge and purge process is incomplete
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Low compression in a diesel engine could be caused byA.worn or broken cylinder liner sealing ringsB.high cooling water temperatureC.worn or broken piston ringsD.low fuel oil pressure
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单选题Worn main bearings in a diesel engine can result in （）A
decreased compression pressureB
increased lube oil pressureC
lower lube oil temperatureD
excessive leakage past the piston rings
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单选题Which of the listed problems can be a cause of low compression pressure in a diesel engine?（）A
clogged air filterB
compression strokeC
burned exhaust valvesD
all of the above
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单选题White smoke exhausting from a diesel engine can be caused by a （）A
high combustion temperatureB
high compression pressureC
cracked cylinder linerD
fuel with a high vanadium content
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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Improper cooling of a diesel engine cylinder liner due to the accumulation of scale deposits may cause （）.A
low compression pressureB
increased piston wearC
increased cylinder lube oil consumptionD
poor contact between compression rings and liner
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单选题A diesel engine emits blue exhaust smoke as a result of（）A
cold intake airB
excessive compression pressureC
excessive cylinder lubricationD
a light load
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单选题A diesel engine may fail to start due to （）A
low air charge temperatureB
high cranking speedC
excessive fuel dilution of lube oilD
high compression pressure
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单选题A dark exhaust from a running diesel engine can be caused by （）A
late ignitionB
water in the fuelC
high compression temperatureD
starting valve stuck open
考题
单选题Low compression of diesel engine may result from （）A
a worn cylinderB
broken piston ringsC
any of A and BD
none of the above
考题
单选题The loss of the diesel engine cylinder air charge through leaky valves, piston rings, worn or scored liners, would be indicated by which of the following sets of conditions?（）A
Low compression pressure and high exhaust temperatureB
Low firing pressure and high exhaust temperatureC
Low compression pressure and low exhaust temperatureD
Low firing pressure and low exhaust temperature
考题
单选题Late fuel oil injection in a diesel engine can result in （）A
fuel knockB
increased powerC
low compression pressureD
high exhaust temperature
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单选题A diesel engine should not be operated at low loads for long periods of time because（）A
heavy carbon deposits will buildup on the valves and in the exhaustB
fuel dilution is increased at low loadC
exhaust valves may be damagedD
all of the above
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单选题Low compression pressure in a diesel engine is caused by（）A
low water in the expansion tankB
improperly seated valvesC
low fuel oil pressureD
worn or broken cylinder liner sealing rings
考题
单选题Low compression in a diesel engine could be caused by（）A
worn or broken cylinder liner sealing ringsB
high cooling water temperatureC
worn or broken piston ringsD
low fuel oil pressure
考题
单选题High firing pressures and a low exhaust temperature in a diesel engine may result from （）.A
decreased piston to cylinder head clearanceB
increased exhaust system back pressureC
early fuel injection timingD
low scavenge air temperature
考题
单选题A diesel engine may be hard to start if the （）A
air intake is restrictedB
engine is cranked too fastC
vibration dampener is faultyD
exhaust back pressure is low
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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
fuel oil injection pressure may not be high enoughD
scavenge and purge process is incomplete
考题
单选题Which of the following reasons represents why the designed compression ratio of a gasoline engine is lower than that of a diesel engine?（）A
compression must be low for effective spark ignitionB
compression must be low for required horsepower and torque generationC
compression must be low to prevent pre-ignitionD
compression must be low to have effective pre-ignition
考题
单选题Low compression pressure in a diesel engine may be the result of （）A
insufficient fuel supply due to fuel pump valves sticking or leakingB
excessive mechanical clearance between the piston crown and cylinder headC
excessively worn fuel pump plungerD
excessive exhaust back pressure
考题
单选题Lube oil in the fresh water cooling system of a diesel engine may result from a （）A
camshaft seizureB
lube oil pump failureC
lube oil cooler failureD
lube oil pump overflow
考题
单选题In the cylinder of a diesel engine fuel is ignited by the（）A
spark from a plug in the pre-combustion chamberB
electrical discharge from the distributorC
heat of compression within the cylinderD
heat from the fuel injection nozzle
考题
单选题A restricted air intake to a diesel engine may result in the engine （）.A
failing to reach rated speedB
knocking under maximum loadC
hunting or surging under light loadD
overspeeding and running away
考题
单选题The function of diesel engine piston compression rings is to （）.A
prevent piston side thrustB
prevent engine friction lossesC
transmit heat from the piston to the cylinder linerD
remove oil from the cylinder combustion space
考题
单选题Piston compression rings used in a diesel engine function to （）A
transfer heat from the cylinder to the pistonB
scrape oil from the sides of the pistonC
seal the combustion space from the crankcasesD
prevent any piston contact with the cylinder liner
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单选题Higher than normal temperature air passing through the intake of a diesel engine will result in（）A
greater overall efficiencyB
greater fuel economyC
lower horsepowerD
lower compression ratio
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