单项选择题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.单项选择题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.单项选择题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.单项选择题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.单项选择题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.单项选择题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

6.单项选择题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

7.单项选择题White smoke exhausting from a diesel engine can be caused by ()

A.low combustion temperature
B.a leaking fuel nozzle check valve
C.late fuel injection
D.plugged oil-scraper ring hole

8.单项选择题White smoke issuing from the exhaust of an auxiliary diesel engine valve opening ()

A.the engine is overloaded
B.the engine is cold
C.there is too much lube oil in the cylinders
D.the turbocharger is fouled

9.单项选择题White smoke exhausting from a diesel engine can result from ()

A.high exhaust temperature
B.high lube oil temperature
C.low turbo-charger speed
D.low cooling water temperature

10.单项选择题White smoke exhausting from an operating diesel engine may indicate ()

A.a cracked liner
B.burning lube oil
C.an overloaded engine
D.insufficient combustion air