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“A centrifuge consists of an electric motor driving a vertic

题目
单选题
“A centrifuge consists of an electric motor driving a vertical shaft on the top of which is mounted the bowl assembly”.According to this sentence, we can know that is mounted on the top of the vertical shaft（）
A

a centrifuge

B

an electric motor

C

a bowl assembly

D

a driving motor

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相似问题和答案

第1题：

Which of the following is NOT true about the centrifugal separator?

A.It can be applied to separate two liquids

B.It cannot separate solids which contaminated in the oil.

C.It consists of purifier and clarifier

D.The centrifuge arranged to separate two liquids is known as purifier


答案：B

第2题：

The primary function of an electric motor is to ______.

A.develop torque

B.generate high voltages

C.produce a magnetic field

D.generate high electrical resistance


正确答案：A

第3题：

Overspeed of the diesel engine driving an electric generator could cause ______.

A.low voltage trip

B.reverse power trip

C.damage to windings

D.excessive exhaust temperatures


正确答案：C
柴油机超速驱动一发电机可能引起对卷损坏。

第4题：

单选题
When hoisting a boat on gravity type davits using an electric motor driven winch，the davit arms should be brought up（）.
A

to their final position with the winch operating at slow speed

B

to the bar stop，and then hand cranked to their final position

C

until just before they make contact with the limit switch，and then hand cranked to their final position

D

to the embarkation deck，and then hand cranked to their final position


正确答案： C
解析： 暂无解析

第5题：

If an attempt is made to hoist a load that exceeds the capacity of an electric winch，an overload safety device causes a circuit breaker to cut off the current to the winch motor ______．

A.when the line pull reaches the rated winch capacity

B.after the line pull exceeds the rated winch capacity

C.after a short build-up of torque

D.immediately


正确答案：B

第6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7题：

Which device is designed to automatically hold the load if power should fail to an electric winch?

A.Pneumatic brake

B.Electromagnetic brake

C.Hand brake

D.Motor controller


正确答案：B

第8题：

In an AC.synchronous motor electric propulsion plant,propeller speed is controlled by()

A.prime mover speed

B.number of energized main motor poles

C.propulsion generator field strength

D.electric coupling field strength


答案：C

第9题：

单选题
When the desired rudder angle is attained by a typical double mm electro-hydraulic steering gear,the（）.
A

ram relief valves bypass oil to stop rudder movement

B

six-way valve shifts to the neutral flow position

C

steering pump electric motor is de - energized by the transfer switch

D

follow-up gear takes the hydraulic pump off stroke


正确答案： D
解析： 暂无解析

第10题：

单选题
It is important with all hydraulic systems to ensure that interlocking arrangements provided for pump or motor control levers are （） before the pump driving motor can be started.
A

in the pert position

B

in the starboard position

C

in the neutral position

D

to be dismantled


正确答案： B
解析： 暂无解析

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