The plunger is machined to very fine tolerances, as is the matched（）in which it reciprocates...

第1题

[单选题] Because of the close tolerances used in diesel engine fuel oil pumps, a worn plunger requires（）

A、grinding the spare plunger to the barrel B、replacing the plunger and the barrel C、highly polishing both the plunger and barrel D、replacing plunger only

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第2题

[单选题] The amount of fuel delivered by a helical plunger fuel injection pump is controlled by （）

A、varying the pump discharge pressure B、varying the pump return pressure C、rotation of the pump plunger D、rotation of the pump barrel

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第3题

[单选题] The plunger may be rotated in the barrel by a rack and （） on a sleeve which is keyed to the plunger.

A、pinion arrangement B、push rod C、handle bar D、cam device

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第4题

[单选题] In a unit injector the amount of fuel that will be forced through the spray nozzle on each stroke of the plunger depends on （）

A、the pump supply pressure B、the slope of the fuel cam C、how the plunger is rotated D、the number of sleeve segments engaged with the rack

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第5题

[单选题] In a jerk pump, the amount of fuel that will be forced through the spray nozzle on each upward stroke of the plunger depends on （）

A、the pump supply pressure B、the slope of the fuel cam C、how the plunger is rotated D、the number of sleeve segments engaged with the rack

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第6题

[单选题] When the follower is on the base circle of the cam, the pump plunger is at the （） of its stroke.

A、top B、middle C、bottom D、any of the above

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第7题

[单选题] The effective pump stroke of an individual port-and-helix fuel injection pump is determined by the （）

A、fuel delivery pressure B、pump plunger diameter C、plunger control rack position D、total pump stroke

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第8题

[单选题] The injector pump is operated by a cam which drives （） up and down.

A、the needle valve B、the plunger C、the piston D、the cylinder

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第9题

[] It is important to note that the injection only takes place when the plunger is moving up the cam （）.

A、A.base circle B、B.slope C、C.bottom point D、D.top point

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The plunger is machined to very fine tolerances, as is the matched（）in which it reciprocates.

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