單項(xiàng)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


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1.單項(xiàng)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

2.單項(xiàng)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

3.單項(xiàng)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

4.單項(xiàng)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

5.單項(xiàng)選擇題White smoke exhausting from a diesel engine can be caused by a （）

A.high combustion temperature
B.high compression pressure
C.cracked cylinder liner
D.fuel with a high vanadium content