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单选题The amount of fluid delivered by a centrifugal pump can be regulated by （）.A throttling the pressure lineB changing the speed of the rotorC either A or BD None of the above is tree

题目
单选题
The amount of fluid delivered by a centrifugal pump can be regulated by （）.
A

throttling the pressure line

B

changing the speed of the rotor

C

either A or B

D

None of the above is tree

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相似问题和答案

第1题：

The amount of fluid delivered by a positive displacement pump can be regulated by _____.

A.throttling the pressure line

B.changing the speed of the driving rotor

C.either A or B

D.None of the above is tree


正确答案：B

第2题：

What causes cavitation in a centrifugal pump ________．

A.Vapor pockets in the flow stream

B.Rough impeller surfaces

C.Worn wearing rings

D.Heavy fluid in the flow stream


正确答案：A

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
If a hydraulic pump is overheating, the cause may be （）.
A

excessive internal leakage in the pump

B

low discharge pressure and fluid flow

C

excessive fluid level in the hydraulic reservoir

D

operation of the pump at 100% efficiency


正确答案： C
解析： 暂无解析

第5题：

单选题
Shaft sealing in a centrifugal pump can be effected by （）.
A

the mechanical seal

B

packed stuffing boxes

C

either A or B

D

neither A nor B


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
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：

Overheating of the hydraulic fluid in an electro-hydraulic anchor windlass can result from a/an( ).

A.overload on the pump motor

B.low fluid level in the reservoir

C.low fluid viscosity around the shaft seal

D.high oil level in the sump


正确答案：B
解析：reservoir：储液器，油箱
译文：电液锚机液压流体过热有可能是油箱中液位低引起的。

第9题：

单选题
Which of the following statements about pump operations is NOT a correct statement?（）
A

In order for a fluid to be pumped, a fluid must be made to flow

B

A substance must be cold in order for it to be pumped

C

The kinetic energy imparted by the pump can be used to force a liquid through a hydraulic system

D

A pump must receive its energy from an external source


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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