If the main engine of an unattended engine room shuts down automatically, it will be indicated by an alarm （）.

单项选择题White smoke exhausting from an operating diesel engine may indicate （）.

A.a cracked liner
B.burning lube oil
C.an overloaded engine
D.insufficient combustion air

单项选择题Electrically operated safety devices on auxiliary diesel engines function to stop the engine by （）.

A.increasing the volume of intake air
B.shutting off the fuel supply
C.increasing the engine back pressure
D.over-speeding the engine

单项选择题When would the available energy of the exhaust gases of a two-stroke cycle diesel engine be insufficient to drive an exhaust gas turbocharger, resulting in the incorrect amount of air for combustion?（）

A.During operation at low speed
B.During operation at rated speed, but low power output
C.During acceleration
D.All of the above

单项选择题If a diesel engine is difficult to start and operates with the engine temperatures lower than normal, you should suspect that the （）.

A.compression pressures are below normal
B.lube oil is diluted with fuel oil
C.cranking speed is too low
D.exhaust system is partially restricted

单项选择题Routine monitoring of a diesel engine should include （）.

A.checking for leaks
B.checking temperatures and pressures
C.listening for abnormal noises
D.all of the above