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单选题
Diesel engine ‘blow-by’ into the crankcase is caused by excessive ring（）
A
back clearance
B
side clearance
C
gap clearance
D
taper clearance
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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
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单选题Regarding a Diesel engine crankcase, the general arrangement and installation should preclude the possibility of （）A
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excessive oil leakage during periods of increased blow-byD
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compression ringsC
cylinder liner sealsD
cylinder liner sealing ring
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valve guidesB
oil control ringsC
valve seatsD
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backB
sideC
gapD
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单选题Diesel engine blow-by is the leakage of combustion gases past the （）A
oil rings onlyB
compression and scraper ringsC
cylinder liner sealingsD
cylinder liner ring grooves
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单选题In a diesel engine, blow-by（）A
increase exhaust back pressureB
causes excessive crankcase pressureC
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单选题A change in the quality of fuel atomization by a diesel engine fuel injector would be caused by a/an （）A
increase in engine speedB
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a leaky cylinder head gasketC
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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How dose water enter the crankcase of a diesel engine?（）A
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单选题When fuel enters the crankcase of a diesel engine, it （）A
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单选题In a diesel engine, excessive cylinder liner wear will cause （） Ⅰ.increased blow-by Ⅱ.wear between the piston ring and grooveA
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单选题The most common diesel engine fuel system problems are caused by （）.A
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dirty fuelC
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单选题Diesel engine piston seizure can be caused by （）A
poor cooling of cylinder wallsB
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单选题If a crankcase explosion occurs in a diesel engine, which of the listed actions should be taken?（）A
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