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With reference to a radial piston pump, which one of the fol

题目
单选题
With reference to a radial piston pump, which one of the following statements is false?（）
A

Surrounding the fixed shaft is a hollow shaft

B

This hollow shaft carries radial bores

C

Each bore is fitted with a well-lapped plunger

D

There are always even numbers of bores

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相似问题和答案

第1题：

Given that Thing is a class， how many objects and reference variables are created by the following code？（）   Thing item， stuff；   item = new Thing（）；   Thing entity = new Thing（）；

  • A、One object is created
  • B、Two objects are created
  • C、Three objects are created
  • D、One reference variable is created
  • E、Two reference variables are created
  • F、Three reference variables are created.

正确答案:B,F

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：

材料：

A typical example of a hydraulic governor is the Woodward. This has adjustable droop for parallel operation and it is fitted with a speed-adjusting control . If required it can be fitted with a synchronizing motor to provide remote control from a switchboard.

A gear pump driven from the engine supplies oil under pressure to accumulator pistons under which is a by-pass to regulate maximum pressure. One branch supplies oil which acts on top of the power piston, the pressure always tending to turn the terminal shaft to shut off fuel, while the other branch supplies oil to the pilot valve which is operated by the linkage from the fly weights above.

Should the speed of the engine decrease due to increased load the flyweights will move towards their center of rotation and lower the position of the pilot valve plunger, admitting oil pressure from the bottom of the power piston. Since, however, the area on the bottom is much greater than the top the net resultant force causes the piston to move upwards. This operates the power lever turning the terminal shaft which varies the cut-off point in the fuel pump through linkage, but as the power piston moves up, the actuating compensating piston moves down.

Oil under this piston is now forced through the needle valve to the receiving compensating piston, raising the outer end of the floating lever and the pilot valve plunger until it has returned to its normal position. This stops further movement of the terminal shaft so that the fuel control is now set in a position corresponding to the increased fuel required to run the engine at normal speed under the increased load.

问题：

This passage is mainly about ___.

A.what type of governor should be provided when the engine is used for electric power generation

B.why the speed of the engine fluctuates

C.how the governor works

D.how the fuel pumps work

The oil from the gear pump will ___. ① be supplied to the accumulator ② act on the power piston ③ be supplied to the pilot valveA.①

B.①②

C.②③

D.①②③

Which of the following is true about the Woodward discussed?A.It is a kind of mechanical governor.

B.It can not be used for parallel operation.

C.It has speed droop.

D.It may only be manually controlled from a switch boar

E.

When the speed of the engine decreases due to increased load, which of the following will NOT happen?A.The flyweights move towards their center

B.The pilot valve plunger moves towards its normal position

C.The power piston moves downwards until it returns to its normal position

D.The terminal shaft moves to a new position

请帮忙给出每个问题的正确答案和分析，谢谢！


问题 1 答案解析：C


问题 2 答案解析：D


问题 3 答案解析：C


问题 4 答案解析：C

第4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5题：

单选题
A variable displacement system of hydraulic drives consists of （）.
A

a variable displacement axial piston pump

B

a constant displacement axial piston pump

C

a reciprocating piston pump

D

a centrifugal pump


正确答案： B
解析： 暂无解析

第6题：

单选题
The function of a centrifugal pump double volute casing is to （）.
A

reduce radial thrust to the impeller

B

double the liquid velocity through the pump when compared to a single volute

C

reduce hydraulic end thrust

D

provide the effect of multi-staging


正确答案： D
解析： 暂无解析

第7题：

问答题
Topic 4：Talk about Virtue　　Questions for reference:　　1) What virtues can you name?　　2) Which one do you think it the most important one?　　3) What should we do in order to establish concept of honor and disgrace among people?

正确答案： 【参考答案】
My name is... My registration number is... My topic is: Talk about Virtue.
We must uphold these core virtues including diligence, honesty, justice and responsibility. Traditionally, we Chinese admire the virtue of plain living and hard struggle. The vital importance is also placed on honesty and justice.
In my eyes, however, responsibility tops our priority. To shoulder some heavy responsibilities, we must keep a style of plain living and hard struggle. Responsibility also means honesty and justice. Everyone must assume a set of responsibilities. For example, we college students must take the responsibility for pursuing the impressive academic performance. But an army of students plant themselves in online games, an activity which compels them to shun huge responsibilities.
The virtue of responsibility is strongly associated with the “Eight Dos and Don’ts” moral campaign in full swing. Under this slogan, everyone must take on his/her own responsibilities and dedicate to his/her own position. Unquestionably, everyone must promote the socialist concept of honor and disgrace.
解析： 暂无解析

第8题：

Which davit type may be operated by one man ________．

A.Quadrantal

B.Gravity

C.Sheath-screw

D.Radial


正确答案：B

第9题：

单选题
The volute pump is one in which the impeller （）.
A

discharges into a gradually widening channel

B

has stationary diffuser vanes

C

produces no kinetic energy

D

All of the above are true


正确答案： B
解析： 暂无解析

第10题：

单选题
One of the main functions of wearing rings, as used in a centrifugal pump, is to （）.
A

maintain radial alignment between the pump impeller and casing

B

absorb all impeller shaft end thrust

C

prevent water leakage to the atmosphere

D

prevent wear of the pump casing and/or impeller


正确答案： D
解析： 暂无解析

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