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 rotor of the hydraulic motor rotates at a speed proportional to the （）.
A
flow of oil
B
pressure of oil
C
A and B
D
temperature of oil
参考解析
解析：
暂无解析
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
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
A hydraulic motor may be driven by______.A.an electric motorB.a diesel engineC.a compressorD.oil
Which method should be used to warm up the pump turbines prior to discharge ________．A.Lock the turbine rotor and slowly bleed in steam until operating temperature is reachedB.Run the pump at high speed with the discharge valves closedC.Run the turbine at slow speed with the pump disconnectedD.Shut the discharge valve and run the pump at slow speed
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 the compensating needle valve of a hydraulic governor is opened more than necessary the governor will （）Ahave a larger than normal dead bandBproduce excessive speed response to a load changeCrespond slowly to any change in engine loadDstabilize engine speed at the new governor setting
单选题It is important with all hydraulic systems to ensure that interlocking arrangements provided for pump or motor control levers are （） before the pump driving motor can be started.Ain the pert positionBin the starboard positionCin the neutral positionDto be dismantled
单选题In a four-stroke engine the camshaft rotates at （）.Ahalf the engine speedBtwice the engine speedCthe engine speedDfour times the engine speed
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In a simple mechanical governor, the （）Acentrifugal force rotates the ball-headBflyweight centrifugal force is balanced by spring forceCflyweight centrifugal force is balanced by hydraulic pressureDspeeder spring alone actuates the fuel control rod
单选题Which method should be used to warm up the pump turbines prior to discharge（）.ALock the turbine rotor and slowly bleed in steam until operating temperature is reachedBRun the pump at high speed with the discharge valves closedCRun the turbine at slow speed with the pump disconnectedDShut the discharge valve and run the pump at slow speed
单选题The （）, cage rotor induction motor is the first choice marine motor in most modern ships because of its electrical and mechanical simplicity.Asingle phaseBtwo phaseCthree phaseDfour phase
单选题The frequency output of an operating alternator is controlled by the （）.Arelative speed of the rotor polesBnumber of turns of wire in the armature coilCstrength of the magnets usedDoutput voltage
单选题In motor-ships, （）, after passing through main and motion bearings and oil cooled pistons, etcis either retained in the bedplate.Athe fuel oilBthe lubricating oilCthe refrigerating oilDthe hydraulic oil
单选题Overload protection on hydraulic system is provided by the use of （）.Astop valvesBpressure relief valvesCbalance valvesDregulating speed valves
单选题To protect the rotor of a motor disassembled for maintenance or overhaul, it should be（）Asuspended by wire slings in one comer of the shopBwrapped in several layers of heavy paper or carboardCsupported by flat wood blocks on the workbenchDreturned to the frame as soon as the bearings are removed
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In a fixed displacement axial piston hydraulic motor, the speed is varied by（）Aregulating the ratio between torque and speed via the torque limiter at the motorBdirecting the motor output flow through a bypass lineCmaintaining a constant flow and pressure inputDcontrolling the input flow rate
单选题Fuel injection uses the jet pump system and a Woodward type hydraulic （） is used to control engine speed.AcontrollerBgovernorCinstrumentDapparatus
单选题A diesel engine is equipped with an isochronous hydraulic governorA decrease in load will cause the engine speed to （）Adecrease onlyBincrease onlyCdecrease slightly then returned to original speedDincrease slightly then returned to original speed
单选题As for a hydraulic vane pump, which of the following is in contact with the vanes during working: （） (1)the rotor (2)the pump shaft (3)the external surface of the housingA(1) onlyB(2) onlyC(1) and (2)D(1),(2)and(3)
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
单选题In a four-stroke engines the camshaft rotates at （）.Ahalf the engine rotational speedBtwice the engine rotational speedCthe engine rotational speedDfour times the engine rotational speed
单选题In a four-stroke/cycle diesel engine, the camshaft rotates at （）Atwice the crankshaft speedBhalf the crankshaft speedCthe same speed as that of the crankshaftDa speed independent of that of the crankshaft