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

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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

单项选择题

Misfiring in a diesel engine at light loads can be caused by（）

A.high lube oil temperature
B.low lube oil temperature
C.excessive cylinder cooling
D.high air injection pressure