單項(xiàng)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


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1.單項(xiàng)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

2.單項(xiàng)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

3.單項(xiàng)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

4.單項(xiàng)選擇題Which harmful consequence may be the result of lube oil sludge accumulation? （）

A.Clogged oil pump suction screens
B.Increased oil operating temperatures
C.Sticking piston rings
D.All of the above

5.單項(xiàng)選擇題High cylinder firing pressure, accompanied by low exhaust temperature, can result from （）

A.improper fuel rack positing
B.lengthy exhaust valve duration
C.extend operation at light load
D.excessively early injection timing