海船船员考试

单选题Which features of a centrifugal pump reduce the need for renewing worn impellers and pump casings?（）A Close radial clearance between impeller hub and casingB Low rotational speed of impellerC Removable end plateD Replaceable impeller and casing wearing

题目
单选题
Which features of a centrifugal pump reduce the need for renewing worn impellers and pump casings?（）
A

Close radial clearance between impeller hub and casing

B

Low rotational speed of impeller

C

Removable end plate

D

Replaceable impeller and casing wearing rings

参考答案和解析
正确答案： C
解析： 暂无解析
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相似问题和答案

第1题：

All of the following steps are taken in starting a centrifugal pump，EXCEPT to ______．

A.Set the relief valve

B.Check the lubrication system

C.Vent the pump casing

D.Open the pump suction and discharge valves


正确答案：A

第2题：

Which of the following are features of server virtualization software？（）

  • A、Larger bandwidth utilization
  • B、Increased application performance
  • C、Reduce resource utilization
  • D、Reduce TCO
  • E、Rapid server provisioning

正确答案:D,E

第3题：

Throttling in the _____ line of a centrifugal pump involves the risk of the pump cavitation.

A.suction

B.exhaust

C.pressure

D.discharge


正确答案：A

第4题：

单选题
Which of the following will be the advantage of a centrifugal pump as compared with a reciprocating pump?（） (1) Its discharge is continuous (2) It has no internal valves (3) Upon accidental closing of discharge valve, excessive pressure will not build up
A

（1），（2）

B

（2），（3）

C

（1），（2），（3）

D

（2）only


正确答案： B
解析： 暂无解析

第5题：

单选题
Which of the following statements is correct with regards to the operation of a centrifugal cargo pump?（）
A

Oil is discharged from the impeller through the outlet

B

Gravity causes the oil to flow toward the discharge

C

The self-priming feature of the centrifugal pump enables it to draw its own suction as it starts

D

The discharge capacity varies directly with the speed of the impeller


正确答案： C
解析： 暂无解析

第6题：

Which pump must always be primed ________．

A.Centrifugal pump

B.Reciprocating pump

C.Rotary pump

D.All of the above


正确答案：A

第7题：

单选题
With respect to centrifugal pump impellers, which of the following descriptions represents the correct centrifugal pump classification? （）
A

Single stage or multistage

B

High pressure or low pressure

C

Open or close coupled

D

Horizontal or vertical


正确答案： C
解析： 暂无解析

第8题：

If a centrifugal pump is driven by a constant speed electric motor and produces a discharge pressure less than designed, the cause is probably ______.

A.excessive pump speed

B.excessive suction head

C.worn wearing rings

D.gross pump misalignment


正确答案：C

第9题：

单选题
Which one is not the component of a typical, marine pattern self-contained unit?（）
A

a centrifugal fan

B

a direct expansion cooler

C

a hermetic compressor

D

a centrifugal pump


正确答案： D
解析： 暂无解析

第10题：

单选题
Most pump manufacturers recommended that the discharge piping for centrifugal pumps be （）.
A

one size larger than the pump discharge nozzle

B

the same size as the pump discharge nozzle

C

one size smaller than the pump discharge nozzle

D

installed with a short radius elbow at the pump


正确答案： C
解析： 暂无解析

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