网友您好， 请在下方输入框内输入要搜索的题目：
题目内容
（请给出正确答案）
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
参考答案
参考解析
解析：
暂无解析
更多 “单选题The primary function of an electric motor is to （）A develop torqueB generate high voltagesC produce a magnetic fieldD generate high electrical resistance” 相关考题
考题
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
考题
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 speedB.excessive suction headC.worn wearing ringsD.gross pump misalignment
考题
The primary function of an electric motor is to ______.A.develop torqueB.generate high voltagesC.produce a magnetic fieldD.generate high electrical resistance
考题
Which device is designed to automatically hold the load if power should fail to an electric winch?A.Pneumatic brakeB.Electromagnetic brakeC.Hand brakeD.Motor controller
考题
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 capacityB.after the line pull exceeds the rated winch capacityC.after a short build-up of torqueD.immediately
考题
What is the default function of a secondary path in MPLS?（）A、to act as an equal-cost path to the primary pathB、to enable another LSP for load balancingC、to act as a diverse backup path to the primary pathD、to allow the use of explicit path selection via EROs
考题
单选题The primary function of the last paragraph of the passage is to _____.A
summarize main ideas of the passageB
illustrate the parents’ digital double standard and the predisposition to printC
exemplify a tech-obsessed parentD
give a counter example to the prevailing trend of e-books
考题
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.
考题
单选题The primary function of the first paragraph of the passage is to _____.A
present a historical context for the author’s observationsB
anticipate challenges to the prescriptions that followC
clarify some disputed definitions of economic termsD
summarize a number of long—accepted explanations
考题
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 manifoldB
shut off power to the pumpC
shut off the power ventilationD
spray water on the fire
考题
单选题If the electric motor driving an air compressor fails to start, the cause may be a （）.A
leaking unloaderB
tripped circuit breakerC
control line leakD
defective pop valve
考题
单选题Any electric motor can be constructed to be（）.A
short proofB
ground proofC
explosion proofD
overload proof
考题
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 ovenA
(1) onlyB
(2) onlyC
both (1) and (2)D
neither (1) or (2)
考题
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 centrifugeB
an electric motorC
a bowl assemblyD
a driving motor
考题
单选题The function of damper windings in a synchronous motor is to （）.A
eliminate slippageB
provide excitationC
provide starting torqueD
increase efficiency
考题
单选题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 capacityB
after the line pull exceeds the rated winch capacityC
after a short build-up of torqueD
immediately
考题
单选题Electric cargo winches have an overload safety device which normally cuts the current to the winch motor（）.A
after torque causes line pull to exceed the rated capacity of the winchB
before the line pull reaches the rated capacity of the winchC
when the line pull reaches the breaking strength of the fallD
before the safe working load of the fall is reached
考题
单选题When there is a fire in a large electric motor, normally the very FIRST step is to （）A
secure the electric supplyB
ventilate area to remove smokeC
start the fire pump and lead out hoseD
apply foam
考题
单选题The primary task of the compressed air system is to deliver the starting air necessary for （）A
starting the MEB
starting the emergency electric alternatorC
driving the main turbineD
driving the turbocharger
考题
单选题After operation, drop the control levers into stowing hole, and （）the electric motor.A
startB
stopC
moveD
open
考题
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 circulationB
a centrifugal counterweight counteracts the force of gravityC
the electric pump motor will cut outD
the control lever will move to the stop position
考题
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 pathB
to enable another LSP for load balancingC
to act as a diverse backup path to the primary pathD
to allow the use of explicit path selection via EROs
考题
单选题The PRIMARY function of a waste heat boiler is to （）.A
reduce engine exhaust noiseB
reduce engine back pressureC
recover heat which otherwise would be lostD
increase turbocharger efficiency
考题
单选题The primary function(s) of an automatic sprinkler system is(are) to（）.A
extinguish the fire which triggers itB
limit the spread of fire and control the amount of heat producedC
protect people in the areas which have sprinkler headsD
alert the crew to the fire
考题
单选题After operation, drop the control levers into stowing hole, and （）(停止)the electric motor.A
startB
stopC
moveD
shift
考题
单选题What type of electric motor is most commonly used on board ship?（）A
non-synchronous electric motorB
synchronous electric motorC
fully enclosed electric motorD
watertight electric motor
考题
单选题The hand steering is a method by which the motion of the rudder is controlled with （）.A
a motor-driven steering wheelB
a pneumatic steering wheelC
a hand-driven steering wheelD
an electric steering wheel
热门标签
最新试卷