海船船员考试

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 acceptableB the injection pump and injection nozzle must be replacedC either the barrel or plunger must be replacedD the barrel

题目
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

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相似问题和答案

第1题：

As the plunger moves upwards in the barrel, injection will commence once the plunger bas_______the spill ports and the pressure builds up.

A.opened up

B.closed off

C.lined up

D.taken off


正确答案：B

第2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


正确答案：C

第3题：

The plunger in a jerk pump is rotated until the release port is uncovered If the port remains uncovered all of the time, which of the listed operations will occur?

A.No fuel will be delivered

B.The maximum effective stroke will be attained

C.The fuel delivered to the cylinder will be excessive

D.The injection nozzle will overheat and carbonize


正确答案：A

第4题：

单选题
The primary function of a fuel delivery check valve assembly is to（）
A

deliver proper fuel quantity to the injection nozzle

B

provide rapid fuel injection cutoff

C

control fuel quantity entering the pump body

D

control fuel pressure delivered to the combustion chamber


正确答案： A
解析： 暂无解析

第5题：

单选题
While overhauling a jerk-type fuel pump it is necessary to replace the pump plungerWhich of the parts listed below must also be replaced?（）
A

Delivery check valve

B

Pump barrel

C

Tubing to the injector

D

Cam follower


正确答案： B
解析： 暂无解析

第6题：

An increase in the fuel injection pump discharge pressure can be caused by a/an _______.

A.leaking delivery valve

B.excessive bearing end play

C.plugged injector spray hole

D.increased plunger stroke


正确答案：C

第7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


正确答案： C
解析： 暂无解析

第8题：

Which of the following problems is the main source of fuel pump and injection system malfunctions?

A.Improper lubrication

B.Air in the fuel system

C.Coated fuel lines

D.Excessive vibration


正确答案：B

第9题：

单选题
Movement of the pump control rack in a fuel injection system using individual plunger-type pumps （）
A

changes the position of the fuel inlet ports

B

changes the length of the pump stroke

C

varies the quantity of fuel delivered

D

varies the compression of the delivery valve spring


正确答案： D
解析： 暂无解析

第10题：

单选题
The plunger in the fuel injector pump, usually operated by a （）, is driven up and down when working.
A

crankshaft

B

camshaft

C

piston rod

D

rack and pinion


正确答案： D
解析： 暂无解析

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