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单选题
One of the differences between a two-stroke engine and a four-stroke engine is,（）
A
a two-stroke engine works without exhaust operation
B
a two-stroke engine works without compression stroke
C
a two-stroke engine works without expansion stroke
D
a two-stroke engine works without suction operation
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Inefficient scavenging；twiceB
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volume of the engineC
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crankshaft speed in a two-stroke cycle diesel engineC
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most critical in a four-stroke cycle diesel engineB
most critical in a two-stroke/cycle diesel engineC
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distributionC
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air intakeB
a fuel outletC
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discharge exhaust gases and smokeB
furnish energy to the turbochargerC
reduce engine room noiseD
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单选题In diesel engines, the four basic events (intake, compression, power and exhaust) are performed once in （）.A
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respectableB
respectfulC
respectiveD
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In a two-stroke/cycle engine, the rings run hotter, requiring the end gap to be greaterB
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单选题One of the differences between a two-stroke engine and a four-stroke engine is,（）A
a two-stroke engine works without exhaust operationB
a two-stroke engine works without compression strokeC
a two-stroke engine works without expansion strokeD
a two-stroke engine works without suction operation
考题
单选题For a given size engine, the two-stroke/cycle diesel engine will deliver more power than a four-stroke/cycle diesel engine because （）.A
it has a longer power strokeB
more air gets into the cylinder each strokeC
it develops twice as many power strokes at the same speedD
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考题
单选题（）uses one or two high pressure pumps for all the cylinders with one more standby, while（）have a separate high-pressure pump for each cylinder.A
A common rail engine；conventional enginesB
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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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pitch of the screwsD
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one-half engine speedB
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twice engine speedD
four times engine speed
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单选题One of the differences between a two-stroke engine and a four-stroke engine is,（）A
a two-stroke engine can’t work without cylindersB
a two-stroke engine can’t work without pistonsC
a two-stroke engine can’t work without crankshaftsD
a two-stroke engine can’t work without a blower
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