單項(xiàng)選擇題What causes diesel fuel to be ignited in the cylinder of an operating diesel engine?（）

A.Spark plug
B.Heat of compression
C.Carburetor
D.Glow plug


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1.單項(xiàng)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

2.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

3.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

4.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

5.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