單項選擇題

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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1.單項選擇題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

2.單項選擇題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
D.engine overload

3.單項選擇題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

4.單項選擇題An efficient seal between the cylinder block and cylinder heads on many diesel engines is obtained with()

A.graphite packing
B.sealing compound
C.lubricating oil
D.gaskets

5.單項選擇題What is the function of the after-cooler installed in the diesel engine air intakes system?()

A.Decrease the air density
B.Increase the exhaust temperature
C.Decrease the lube oil temperature
D.Increase the air density