单项选择题
A dirty fuel oil filter is can be detected by （）
Ⅰ.fuel oil analysis
Ⅱ.observing the pressure drop across the filter
A.Ⅰonly
B.Ⅱonly
C.eitherⅠorⅡ
D.neitherⅠnor
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单项选择题
The function of the after-cooler installed between the turbocharger and intake manifold on some diesel engine, is to （）
A.increase the density of the intake air
B.decrease turbocharger power usage
C.reduce exhaust gas temperature
D.compensate for turbocharger PRM fluctuations -
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High lube oil temperatures developing in a diesel engine can result from（）
A.high oil pressure
B.excessive bearing end play
C.plugged oil control rings
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单项选择题
An increase in the fuel injection pump discharge pressure can be caused by a/an （）
A.leaking delivery valve
B.excessive bearing end play
C.plugged injector spray hole
D.increased plunger stroke
