The injection may be delayed, （）the pumps are in good order, if the fuel lines to the injection valves have not been cleared of air.

A、because

B、though

C、since

D、until

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更多“The injection may be delayed, （）the pumps are in good order, if the fuel lines to the injection valves have not been cleared of air.”相关的问题

第1题

[单选题] If fuel injection to a four-stroke/cycle diesel engine begins earlier than designed, ignition may be delayed because the （）.

A、cylinder compression pressure may not be high enough B、cylinder compression temperature may be too high C、fuel oil injection pressure may not be high enough D、scavenge and purge process is incomplete

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第2题

[单选题] Which of the following problems may occur if the opening pressure of a fuel injection nozzle is greater than specified by the engine manufacturer?（）

A、The amount of fuel injected will be increased B、The start of injection will be retarded C、The nozzle will permit fuel to dribble D、The spray pattern will be distorted

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第3题

[单选题] With Variable Injection Timing the start of injection may be （）as the engine load is reduced.

A、advanced B、retarded C、kept constant D、none of the above

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第4题

[单选题] 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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第5题

[单选题] Fuels of different qualities may require advancing or retarding the injection timing, in addition to which if the injection timing is advanced when the engine is running at loads below the （）, then a saving in fuel can be achieved.

A、BHP B、MCR C、IHP D、MEP

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第6题

[单选题] If the firing pressures in a diesel engine are high, although the exhaust temperatures are normal, the cause may be（）

A、early injection timing B、worn orifices in the injection nozzles C、worn or scored cylinder liners D、using a fuel with too low of a cetane number

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第7题

[单选题] If the plunger or barrel of a fuel injection jerk pump becomes damaged,（）

A、only the replacement of the entire pump would be acceptable B、the injection pump and injection nozzle must be replaced C、either the barrel or plunger must be replaced D、the barrel and plunger must be replaced as a unit