搜题

【单选题】

If an electric motor driven air compressor fails to start, it may be due to a （）.

A、leaking discharge valve

B、jammed suction valve

C、tripped overload relay

D、broken discharge un-loader

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更多“If an electric motor driven air compressor fails to start, it may be due to a （）.”相关的问题

第1题

[] What type of electric motor is most commonly used on board ship?（）

A、A.non-synchronous electric motor B、B.synchronous electric motor C、C.fully enclosed electric motor D、D.watertight electric motor

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第2题

[单选题] 操作完后，关掉电动机。（）

A、After operation, start the electric motor. B、Before operation, stop the electric motor. C、Before operation, start the electric motor. D、After operation, stop the electric motor.

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第3题

[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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第4题

[单选题] 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

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第5题

[单选题] If the electric motor driving an air compressor fails to start, the cause may be a （）.

A、leaking unloader B、tripped circuit breaker C、control line leak D、defective pop valve

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第6题

[单选题] （） is a machine by which electrical energy is transformed into mechanical energy.

A、An alternator B、An electric motor C、A diesel engine D、A main switchboard

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第7题

[单选题] A hydraulic motor may be driven by （）.

A、an electric motor B、a diesel engine C、a compressor D、oil

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第8题

[单选题] If a small electric motor is immersed in salt water it should be （） (1) washed in fresh water (2) dried in an oven

A、(1) only B、(2) only C、both (1) and (2) D、neither (1) or (2)

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第9题

[单选题] 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

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