海船船员考试

单选题With respect to centrifugal pump impellers, which of the following descriptions represents the correct centrifugal pump classification? （）A Single stage or multistageB High pressure or low pressureC Open or close coupledD Horizontal or vertical

题目
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

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相似问题和答案

第1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2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
Pitting in the suction areas of a centrifugal pump bronze impeller is usually caused by （）.
A

cavitation

B

electrolysis

C

abrasion

D

corrosion


正确答案： A
解析： 暂无解析

第5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6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7题：

单选题
A multistage centrifugal pump can be BEST described as having （）.
A

two or more impellers housed together in one casing and mounted on a single shaft

B

a single stepped impeller mounted in a progressively staged casing

C

a large radial clearance between the impeller and casing to prevent overheating due to

D

an increase in the discharge velocity of the liquid with a corresponding decrease in pressure through the stages


正确答案： D
解析： 暂无解析

第8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9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

第10题：

单选题
Increasing the speed of a centrifugal pump will result in an increase in its capacity Another means of increasing the capacity of a centrifugal pump is to increase the （）.
A

diameter of the discharge piping, with all other factors remaining the same

B

diameter of the suction piping, with all other factors remaining the same

C

width of the impeller only

D

diameter of the impeller


正确答案： B
解析： 暂无解析

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