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

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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

单项选择题

Diesel engine mufflers accomplish noise reduction by （）

A.reducing exhaust gas velocity
B.increasing the frequency of gas vibration
C.the use of long head pipes
D.the use of zinc electrodes