單項(xiàng)選擇題In the common rail system, excessive pressure in the header may be caused by （）

A.improper adjustment of the bypass valve
B.a dribble in the fuel injection nozzle
C.insufficient leak-off through injection nozzle packing
D.a malfunctioning injection nozzle


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1.單項(xiàng)選擇題Diesel engine valve springs function to （）

A.hold the valves open
B.keep the valves off their seats until the exhaust stroke is completed
C.close the valves
D.open inlet valves when the air injection cycle begins

2.單項(xiàng)選擇題Worn diesel engine intake valve guides can result in （）

A.increased engine breathing efficiency
B.excessive valve lash
C.excessive lube oil consumption
D.lower than normal fuel consumption

3.單項(xiàng)選擇題If a diesel engine runs roughly, which of the systems listed is most likely to be at fault?（）

A.Fuel
B.Lubricating
C.Cooling
D.Ignition

4.單項(xiàng)選擇題Excessive piston ring wear in a diesel engine will cause（）

A.high lube oil viscosity
B.increased lube oil consumption
C.low lube oil temperatures
D.high firing pressures

5.單項(xiàng)選擇題In the voyage, when carrying out abandon ship drill, should be test every time（）.

A.the emergency lighting system for muster and abandon ship
B.air/oil emergency shut-down
C.M-Eemergency operation
D.main/auxiliary steering gear changing