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

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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

单项选择题

In a diesel engine exhaust system, the cooling of the exhaust gases below their dew point, will result in （）

A.increased engine back pressure
B.sulfuric acid corrosion
C.surface pitting of the turbocharger
D.moisture impingement on the turbocharger compressor blade

单项选择题

When a diesel engine compression pressure is checked, the indicator is connected to the （）

A.cylinder exhaust ports
B.injection line
C.cylinder indicator cock
D.banjo oiler line