海船船员考试

单选题A deepwell pump is a type of（）.A screw pumpB centrifugal pumpC eductorD gear pump

题目
单选题
A deepwell pump is a type of（）.
A

screw pump

B

centrifugal pump

C

eductor

D

gear pump

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相似问题和答案

第1题：

Which of the listed problems could produce a high absolute pressure within a flash type evaporator?

A.production of high salinity distillate

B.seawater feed temperature below 165℃

C.a leak in the first stage demister

D.a cracked distillate pump vent line


正确答案：D

第2题：

In which situations does the Oracle Data Pump use external tables and not the direct path load whileexporting a table（）

  • A、if a table is not in a cluster
  • B、if a table has an active trigger
  • C、if a table has an encrypted
  • D、if a table has a column of data type LONG defined on it
  • E、if a table has a referential integrity constraint defined on it

正确答案:B,C,E

第3题：

In an auxiliary diesel engine bypass type lubricating oil system, the main lube oil pump forces_______ .

A.all of the oil used by the engine through a filter

B.some of the oil used by the engine through a filter

C.some of the oil used by the engine through a centrifuge

D.all of the oil used by the engine through a centrifuge


正确答案：C

第4题：

单选题
Which of the listed problems could produce a high absolute pressure within a flash type evaporator?（）
A

Production of high salinity distillate

B

Seawater feed temperature below 165℃

C

A leak in the first stage demister

D

A cracked distillate pump vent line


正确答案： B
解析： 暂无解析

第5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
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8题：

If it becomes necessary to pump bilges while a vessel is in port, which of the following procedures should be followed?

A.Pump only if the discharge is led to a shore tank or barge

B.Pump only during the hours of darkness

C.Pump only on the outgoing tide

D.Pump only as much as is necessary


正确答案：A

第9题：

单选题
A centrifugal bilge pump requires priming （）.
A

primarily to lubricate the shaft seals

B

due to the inability of this type of pump to lift water to cover the suction (eye) of the impeller

C

to initially unload the pump by having its head pressure equal to discharge pressure

D

in order to overcome the potential energy of water in the discharge line


正确答案： D
解析： 暂无解析

第10题：

单选题
In a bypass type lubrication system for a diesel engine, the dirty oil line to the centrifuge should be taken from the （）.
A

lube oil pump suction line

B

lube oil pump discharge line

C

bottom of the lube oil sump

D

outlet from the lube oil header


正确答案： C
解析： 暂无解析

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