单项选择题

Leaking oil seals on a diesel engine turbocharger can cause（）

A.the engine to run after the fuel has been secured
B.the engine to over-speed
C.a fire
D.all of the above

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单项选择题

If the back clearance of a piston ring is excessive,（）

A.compression pressure in the cylinder will be higher
B.carbon will accumulate behind the ring
C.combustion gases will penetrate beneath the ring land
D.piston side thrust will be increased

单项选择题

Corrosion and grooving on the blade of an exhaust driven turbocharger is caused by certain components of residual fuel oilsThese components are vanadium,sodium, and（）

A.copper
B.carbon
C.hydrogen
D.sulfur

单项选择题

If a crankcase explosion has occurred in a diesel engine, and the crankcase remains intact, which of following precautions should be observed?（）

A.The cylinder indicator cocks should be opened
B.The sump lube oil scavenge pump should be secured immediately
C.The explosion relief valves should be manually opened
D.The crankcase should remain unopened until the engine has cooled