A hydraulic motor may be driven by______.A.an electric motorB.a diesel engineC.a compressorD.oil
A hydraulic motor may be driven by______.
A.an electric motor
B.a diesel engine
C.a compressor
D.oil
相关考题：
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
The closing of the exhaust valves used on a modern, large, low-speed, main propulsion diesel engine may be directly provided by_______.A.large conical springsB.compressed air pressureC.hydraulic pressureD.exhaust gas pressure
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
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
The refrigeration system low pressure cutout switch is actuated by______.A.an electric system managerB.a sensing bulb at the tail coil of the evaporatorC.pressure changes in the suction lineD.failure of the king solenoid valve
这些舱盖通常是用电力或液压驱动的。（）A、These hatches are usually driven by electric or hydraulic power.B、These hatch covers are usually driven by electric or hydraulic power.C、These hatch covers are usually driven by electric.D、These hatch covers are usually driven by hydraulic power.
These hatch covers are usually driven by electric or hydraulic power.（）A、这些舱盖通常是用电力驱动的B、这些舱盖通常是用液压驱动的C、这些舱盖通常是用电力或液压驱动的D、这些舱盖通常是用油压或液压驱动的
单选题When the desired rudder angle is attained by a typical double mm electro-hydraulic steering gear,the（）.Aram relief valves bypass oil to stop rudder movementBsix-way valve shifts to the neutral flow positionCsteering pump electric motor is de - energized by the transfer switchDfollow-up gear takes the hydraulic pump off stroke
单选题If the pump for a hydraulic anchor windlass is overheating, the cause may be （）.Aexcessive drive motor speedBexcessive pump discharge pressureCtoo low of a tilting box angleDinsufficient drive motor speed
单选题If an electric motor driven air compressor fails to start, it may be due to a （）.Aleaking discharge valveBjammed suction valveCtripped overload relayDbroken discharge un-loader
单选题这些舱盖通常是用电力或液压驱动的。（）AThese hatches are usually driven by electric or hydraulic power.BThese hatch covers are usually driven by electric or hydraulic power.CThese hatch covers are usually driven by electric.DThese hatch covers are usually driven by hydraulic power.
单选题When hoisting a boat on gravity type davits using an electric motor driven winch，the davit arms should be brought up（）.Ato their final position with the winch operating at slow speedBto the bar stop，and then hand cranked to their final positionCuntil just before they make contact with the limit switch，and then hand cranked to their final positionDto the embarkation deck，and then hand cranked to their final position
单选题操作完后，关掉电动机。（）AAfter operation, start the electric motor.BBefore operation, stop the electric motor.CBefore operation, start the electric motor.DAfter operation, stop the electric motor.
单选题An AC synchronous transmission type remote steering control system consists of a （）.Atransmitter at the steering station and a receiver at the steering engineBreversible motor at the steering station geared to the steering pumpsCsmall induction motor on the bridge which controls the redder through pulleysDvariable displacement hydraulic pump driven by a reversible DC motor
单选题If the electric motor driving an air compressor fails to start, the cause may be a （）.Aleaking unloaderBtripped circuit breakerCcontrol line leakDdefective pop valve
单选题Any electric motor can be constructed to be（）.Ashort proofBground proofCexplosion proofDoverload proof
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（）Aa centrifugeBan electric motorCa bowl assemblyDa driving motor
单选题If a centrifugal pump is driven by a constant speed electric motor and produces a discharge pressure less than designed, the cause is probably（）.Aexcessive pump speedBexcessive suction headCworn wearing ringsDgross pump misalignment
单选题Leakage of hydraulic fluid from around the shaft of a hydraulic motor may be caused by（）Apermanent loss of pump suctionBworn shaft sealsChigh level in the oil sumpDlow motor RPM
单选题For occasional heavy loads, two cranes can be arranged to work together. The operating （） for deck crane motors may be hydraulic electric.AprincipleBmediumCinstructionDvoltage
单选题If a hydraulic pump on a winch accidentally stops while hoisting，the load will stay suspended because（）.Aa check valve will close that prevents reverse circulationBa centrifugal counterweight counteracts the force of gravityCthe electric pump motor will cut outDthe control lever will move to the stop position
单选题The rotor of the hydraulic motor rotates at a speed proportional to the （）.Aflow of oilBpressure of oilCA and BDtemperature of oil
单选题The most common forms of main drive used on deck auxiliaries are （）.Asteam plants, electric motors and compressed airBdiesel engine, hydraulic machinery and compressed airCsteam plants, electric motors and hydraulic machineryDdiesel engines, steam plants and hydraulic machinery
单选题What type of electric motor is most commonly used on board ship?（）Anon-synchronous electric motorBsynchronous electric motorCfully enclosed electric motorDwatertight electric motor
单选题The hand steering is a method by which the motion of the rudder is controlled with （）.Aa motor-driven steering wheelBa pneumatic steering wheelCa hand-driven steering wheelDan electric steering wheel
单选题If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.Aa low load on the unitBa clogged pump suction strainerCa blockage in the line between the pump and hydraulic motorDthe hydraulic motor turning too fast