海船船员考试

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 barrelB replacing the plunger and the barrelC highly polishing both the plunger and barrelD replacing plunger only

题目
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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相似问题和答案

第1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2题：

利用TCM软件清理Axios光谱仪Plunger的密封圈灰尘的操作步骤是（）

  • A、关闭高压、放真空、启动TCM软件、选择第二项M、按F1关闭cap、按F3使Plunger向下，再按F1打开cap。
  • B、放真空、关闭高压、启动TCM软件、选择第二项M、按F1关闭cap、按F3使Plunger向下，再按F1打开cap。
  • C、放真空、关闭高压、启动TCM软件、选择第二项M、按F1关闭cap、按F2使Plunger向下，再按F1打开cap。
  • D、关闭高压、放真空、启动TCM软件、选择第二项M、按F1关闭cap、按F3使Plunger向下，再按F1打开cap。

正确答案:A

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
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5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


正确答案： B
解析： 暂无解析

第6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7题：

单选题
When disassembling or assembling an injection pump plunger and barrel you should （）
A

keep the parts immersed in diesel fuel

B

always keep the plunger and barrel together

C

work over a linoleum-type surface

D

all of the above


正确答案： D
解析： 暂无解析

第8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9题：

单选题
It is important to note that the injection only takes place when the plunger is moving up the cam （）.
A

base circle

B

slope

C

bottom point

D

top point


正确答案： B
解析： 暂无解析

第10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

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