The primary function of an electric motor is to ______.A.develop torqueB.generate high voltagesC.produce a magnetic fieldD.generate high electrical resistance

题目

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

相似考题

1.( ) can provide an asynchronous link between two ac electric power system with different nominal frequencies.A.The HVDC (high voltage DC) transmissionB.The EHV (extra-high voltage) AC transmissionC.The AC distributionD.Generators

2.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 speedB.excessive suction headC.worn wearing ringsD.gross pump misalignment

3.Leakage of hydraulic fluid from around the shaft of a hydraulic motor may be caused by ______.A.permanent loss of pump suctionB.worn shaft sealsC.high level in the oil sumpD.low motor RPM

4.In an AC.synchronous motor electric propulsion plant,propeller speed is controlled by()A.prime mover speedB.number of energized main motor polesC.propulsion generator field strengthD.electric coupling field strength

更多“The primary function of an electric motor is to ______.A.develop torqueB.generate high vol ”相关问题

  • 第1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.


    正确答案： D
    解析： 暂无解析

  • 第3题：

    单选题
    The high air velocity leaving the compressor of an exhaust gas turbocharger is converted to pressure in the （）
    A

    inlet nozzle ring

    B

    turbine wheel blade

    C

    diffuser passages

    D

    inlet vol


    正确答案： B
    解析： 暂无解析

  • 第4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


    正确答案： B
    解析： 暂无解析

  • 第5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)


    正确答案： A
    解析： 暂无解析

  • 第6题：

    单选题
    The function of damper windings in a synchronous motor is to （）.
    A

    eliminate slippage

    B

    provide excitation

    C

    provide starting torque

    D

    increase efficiency


    正确答案： C
    解析： 暂无解析

  • 第7题：

    单选题
    When there is a fire in a large electric motor, normally the very FIRST step is to （）
    A

    secure the electric supply

    B

    ventilate area to remove smoke

    C

    start the fire pump and lead out hose

    D

    apply foam


    正确答案： C
    解析： 暂无解析

  • 第8题：

    单选题
    After operation, drop the control levers into stowing hole, and （）the electric motor.
    A

    start

    B

    stop

    C

    move

    D

    open


    正确答案： B
    解析： 暂无解析

  • 第9题：

    单选题
    What is the default function of a secondary path in MPLS?（）
    A

    to act as an equal-cost path to the primary path

    B

    to enable another LSP for load balancing

    C

    to act as a diverse backup path to the primary path

    D

    to allow the use of explicit path selection via EROs


    正确答案： A
    解析： 暂无解析

  • 第10题：

    单选题
    The PRIMARY function of a waste heat boiler is to （）.
    A

    reduce engine exhaust noise

    B

    reduce engine back pressure

    C

    recover heat which otherwise would be lost

    D

    increase turbocharger efficiency


    正确答案： B
    解析： 暂无解析

  • 第11题：

    单选题
    What type of electric motor is most commonly used on board ship?（）
    A

    non-synchronous electric motor

    B

    synchronous electric motor

    C

    fully enclosed electric motor

    D

    watertight electric motor


    正确答案： C
    解析： 暂无解析

  • 第12题：

    单选题
    The hand steering is a method by which the motion of the rudder is controlled with （）.
    A

    a motor-driven steering wheel

    B

    a pneumatic steering wheel

    C

    a hand-driven steering wheel

    D

    an electric steering wheel


    正确答案： C
    解析： 暂无解析

  • 第13题：

    What is the default function of a secondary path in MPLS?（）

    • A、to act as an equal-cost path to the primary path
    • B、to enable another LSP for load balancing
    • C、to act as a diverse backup path to the primary path
    • D、to allow the use of explicit path selection via EROs

    正确答案:C

  • 第14题：

    单选题
    You are transferring fuel from the storage tanks to the day tanks by means of an electric fuel oil transfer pumpIf the pump motor catches fire, you would FIRST （）.
    A

    secure the fuel manifold

    B

    shut off power to the pump

    C

    shut off the power ventilation

    D

    spray water on the fire


    正确答案： A
    解析： 暂无解析

  • 第15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


    正确答案： D
    解析： 暂无解析

  • 第16题：

    单选题
    Any electric motor can be constructed to be（）.
    A

    short proof

    B

    ground proof

    C

    explosion proof

    D

    overload proof


    正确答案： D
    解析： 暂无解析

  • 第17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


    正确答案： C
    解析： 暂无解析

  • 第18题：

    单选题
    When Google and Facebook were established, the founders were still _____.
    A

    in high school

    B

    in the army

    C

    in primary school

    D

    at college


    正确答案： D
    解析：

  • 第19题：

    单选题
    The primary task of the compressed air system is to deliver the starting air necessary for （）
    A

    starting the ME

    B

    starting the emergency electric alternator

    C

    driving the main turbine

    D

    driving the turbocharger


    正确答案： A
    解析： 暂无解析

  • 第20题：

    单选题
    If a hydraulic pump on a winch accidentally stops while hoisting，the load will stay suspended because（）.
    A

    a check valve will close that prevents reverse circulation

    B

    a centrifugal counterweight counteracts the force of gravity

    C

    the electric pump motor will cut out

    D

    the control lever will move to the stop position


    正确答案： A
    解析： 暂无解析

  • 第21题：

    单选题
    When bilge water is heated in a holding tank, which one of the following statements is not accurate?（）
    A

    The high temperature facilitates primary gravity separation

    B

    Most of the oil and organic solvents are raised to the top layer

    C

    The high the temperature is, the more the top oil will be collected

    D

    The high temperature has little use on the separation of emulsified oil


    正确答案： D
    解析： 暂无解析

  • 第22题：

    单选题
    After operation, drop the control levers into stowing hole, and （）(停止)the electric motor.
    A

    start

    B

    stop

    C

    move

    D

    shift


    正确答案： C
    解析： 暂无解析

  • 第23题：

    单选题
    In the American educational system, intermediate school is the _____ stage between the primary grades and high schoo1.
    A

    traditional

    B

    transitional

    C

    transmissible

    D

    transient


    正确答案： B
    解析：
    句意：在美国的教育制度中，中学是小学和高中的过渡阶段。transitional过渡性的，常用来形容stage阶段，与可推测的句中意思“中学应该是介于小学和高中之间的‘过渡’阶段”十分符合，因此B为正确答案。traditional传统的。transmissible可传送的。transient短暂的，瞬时的。

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