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?（）

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

单项选择题A diesel engine is operating with excessively high exhaust temperatures at all cylindersTo correct this condition, you should FIRST （）.

A.reduce the engine load
B.increase the cooling water flow
C.increase the lube oil pressure
D.adjust the fuel rack

单项选择题The function of diesel engine piston compression rings is to （）.

A.prevent piston side thrust
B.prevent engine friction losses
C.transmit heat from the piston to the cylinder liner
D.remove oil from the cylinder combustion space

单项选择题A diesel engine piston ring face is in direct contact with the （）.

A.top of the ring groove
B.cylinder liner oil film
C.bottom of the ring groove
D.back of the ring groove