单项选择题

A water jacket is placed around the exhaust manifolds of propulsion diesel engines to（）

A.reduce heat radiation to the engine room
B.aid in preventing turbocharger overheating
C.condense and drain moisture from exhaust gases
D.dampen exhaust gas pulsations in the manifold

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单项选择题

An increase in diesel engine crankcase pressure generally indicates excessive（）

A.compression pressure
B.lube oil header pressure
C.scavenge air pressure
D.piston ring blow-by

单项选择题

You are inspecting the lower main precision bearings on a diesel engine.You observe that about half the thin Babbitt linings are of a milky white colourThis condition is caused by （）

A.large dirt particles in the oil supply
B.insufficient lubricating oil and overheating
C.normal wear
D.water contamination of the lube oil

单项选择题

A substantial increase in crankcase pressure could be an indication of （）

A.excessive lube oil pressure
B.the proper seating of new rings
C.a worn cylinder liner
D.a malfunctioning cylinder relief valve