單項選擇題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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1.單項選擇題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

2.單項選擇題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

3.單項選擇題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

4.單項選擇題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

5.單項選擇題An indication of an overloaded main propulsion diesel engine is ()

A.white smoke in the exhaust
B.high exhaust gas pyrometer readings
C.sparks in the exhaust
D.blue smoke in the exhaust