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单选题
Broken intake valve springs on one cylinder of a diesel engine can cause the engine to （）
A
Over speed
B
fire improperly
C
lose oil pressure
D
overheatrapidly
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liquid in the cylinderB
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incorrectly adjusted intake valve clearance
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fuel injection system malfunctionsC
high cylinder lube oil temperaturesD
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单选题Worn diesel engine intake valve guides can result in （）A
increased engine breathing efficiencyB
excessive valve lashC
excessive lube oil consumptionD
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单选题During the valve overlap period, the exhaust pressure of a turbochargers, four-stroke/cycle diesel engine must be less than the intake manifold pressure to ensure （）A
effective cylinder scavenging and coolingB
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单选题The intake valves in a diesel engine are reseated by （）.A
cam followersB
push rodsC
combustion gasesD
valve springs
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worn or broken cylinder liner sealing ringsB
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单选题Exhaust valve openings in a diesel engine cylinder head are made as large as practical to （）A
increase back pressure during the exhaust processB
facilitate periodic replacement of the valvesC
reduce the pumping loss associated with scavengingD
reduce tension on valve springs
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a defective or broken high pressure un-loaderB
a loose valve plateC
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worn main bearingC
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nearlyC
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单选题A Kort nozzle is a(n)（）.A
hollow tube surrounding the propeller used to improve thrustB
nozzle attached to a firefighting hoseC
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preheating the combustion chamberC
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a cylinder air charge of higher pressureB
increased pumping lossesC
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