单项选择题

One of the purposes for water cooling the exhaust manifold in marine diesel engine is to （）

A.reduce lube oil temperature
B.raise exhaust temperature reduce
C.excessive heating of engine room
D.reduce load on cooling water pump

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单项选择题

A condition contributing to diesel engine piston rings sticking in the ring grooves, is insufficient ring clearance at the ring（）

A.gap
B.side
C.back
D.radial

单项选择题

An auxiliary diesel engine may fail to start due to（）

A.low exhaust back pressure
B.high lube oil temperature
C.insufficient cranking speed
D.excessive fuel atomization

单项选择题

Diesel engine exhaust noise can be reduced in an exhaust muffler by （）

A.changing the direction of exhaust gas flow
B.increasing the exhaust gas velocity
C.changing the exhaust gas weight
D.increasing the exhaust gas static pressure