搜题

【单选题】

Universal motors will operate on AC or DC current, and are generally found in （）

A、portable tools

B、large pump motors

C、turbo electric main motors

D、forced draft fans

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更多“Universal motors will operate on AC or DC current, and are generally found in （）”相关的问题

第1题

[] 外流活门的哪个马达直接受座舱增压面板控制？

A、A、MOTOR3 B、B、MOTOR1和MOTOR2 C、C、MOTOR1

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第2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3题

[单选题] In cargo crane, （） for lifting the load.

A、a hoisting motor B、a luffing motor C、a mooring motor D、a slewing motor

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第4题

[单选题] Which of the following electric motors would be the safest and most reliable to use on the main deck of a vessel in foul weather conditions?（）

A、Sealed motors B、Drip proof motors C、Enclosed motors D、Watertight motors

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第5题

[单选题] Which of the following electric motors would be the safest and most reliable to use on the main deck of a vessel in foul weather conditions?（）

A、Sealed motors B、Drip proof motors C、Enclosed motors D、Watertight motors

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第6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7题

[单选题] Diesel engine electric starting motors generally require heavier duty motors and motors and operate at higher voltages than comparable starting motors for gasoline engines due to（）

A、higher speed required B、flywheel-effect C、lower starting temperatures D、higher compression pressures

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第8题

[单选题] In a general cargo crane, （） is fitted to lift the cargo load.

A、the slewing motor B、the luffing motor C、the hoisting motor D、none of the above

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第9题

[单选题] In a general cargo crane, （） is fitted to raise or lower the jib.

A、the slewing motor B、the luffing motor C、the hoisting motor D、none of the above

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