單項選擇題If a diesel engine fails to start，one of the likely causes is （）

A.low compression temperature
B.low ambient air pressure
C.high lube oil pump pressure
D.high fuel oil booster pump pressure


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1.單項選擇題Icreasing the exhaust valve tappet clearance of a diesel engine will result in the exhaust valve opening （）

A.later and closing earlier
B.later and closing later
C.earlier and closing earlier
D.earlier and closing later

2.單項選擇題When the opening pressure of a diesel fuel injector is greater than that specified by the engine manufacturer，the （）

A.quantity of fuel injected is decreased
B.quantity of fuel injected will always be increased
C.start of injection is advanced
D.duration of injection will always be greater

3.單項選擇題Broken intake valve springs on one cylinder of a diesel engine can cause the engine to （）

A.Over speed
B.fire improperly
C.lose oil pressure
D.overheatrapidly

4.單項選擇題A device which functions to bring a diesel engine to a full stop to protect it from damage is known as a/an （）

A.torque limiter
B.over-speed trip
C.over-speed governor
D.load limit governor

5.單項選擇題Black smoke exhausting from an operating diesel engine can be caused by （）

A.fuel dribbling from leaking fuel injectors
B.burning fuel with a high carbon content
C.burning fuel with a high vanadium content
D.burning fuel with a lower sulphur content