單項選擇題If a diesel engine driving a generator turns over freely but fails to fire properly, the cause could be ()

A.excessive compression pressure
B.air in the fuel lines
C.high fuel pressure
D.excessive load


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1.單項選擇題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

3.單項選擇題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

4.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

5.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