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 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
参考答案
参考解析
解析：
暂无解析
更多 “单选题The rotor of the hydraulic motor rotates at a speed proportional to the （）.A flow of oilB pressure of oilC A and BD temperature of oil” 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
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
考题
A hydraulic motor may be driven by______.A.an electric motorB.a diesel engineC.a compressorD.oil
考题
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
考题
单选题When the desired rudder angle is attained by a typical double mm electro-hydraulic steering gear,the（）.A
ram relief valves bypass oil to stop rudder movementB
six-way valve shifts to the neutral flow positionC
steering pump electric motor is de - energized by the transfer switchD
follow-up gear takes the hydraulic pump off stroke
考题
单选题If the pump for a hydraulic anchor windlass is overheating, the cause may be （）.A
excessive drive motor speedB
excessive pump discharge pressureC
too low of a tilting box angleD
insufficient drive motor speed
考题
单选题If the compensating needle valve of a hydraulic governor is opened more than necessary the governor will （）A
have a larger than normal dead bandB
produce excessive speed response to a load changeC
respond slowly to any change in engine loadD
stabilize engine speed at the new governor setting
考题
单选题A hydraulic motor may be driven by （）.A
an electric motorB
a diesel engineC
a compressorD
oil
考题
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.A
in the pert positionB
in the starboard positionC
in the neutral positionD
to be dismantled
考题
单选题In a four-stroke engine the camshaft rotates at （）.A
half the engine speedB
twice the engine speedC
the engine speedD
four times the engine speed
考题
单选题An AC synchronous transmission type remote steering control system consists of a （）.A
transmitter at the steering station and a receiver at the steering engineB
reversible motor at the steering station geared to the steering pumpsC
small induction motor on the bridge which controls the redder through pulleysD
variable displacement hydraulic pump driven by a reversible DC motor
考题
单选题In a simple mechanical governor, the （）A
centrifugal force rotates the ball-headB
flyweight centrifugal force is balanced by spring forceC
flyweight centrifugal force is balanced by hydraulic pressureD
speeder spring alone actuates the fuel control rod
考题
单选题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
考题
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.A
single phaseB
two phaseC
three phaseD
four phase
考题
单选题The frequency output of an operating alternator is controlled by the （）.A
relative speed of the rotor polesB
number of turns of wire in the armature coilC
strength of the magnets usedD
output voltage
考题
单选题In motor-ships, （）, after passing through main and motion bearings and oil cooled pistons, etcis either retained in the bedplate.A
the fuel oilB
the lubricating oilC
the refrigerating oilD
the hydraulic oil
考题
单选题Overload protection on hydraulic system is provided by the use of （）.A
stop valvesB
pressure relief valvesC
balance valvesD
regulating speed valves
考题
单选题To protect the rotor of a motor disassembled for maintenance or overhaul, it should be（）A
suspended by wire slings in one comer of the shopB
wrapped in several layers of heavy paper or carboardC
supported by flat wood blocks on the workbenchD
returned to the frame as soon as the bearings are removed
考题
单选题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
考题
单选题The rotor of the hydraulic motor rotates at a speed proportional to the （）.A
flow of oilB
pressure of oilC
A and BD
temperature of oil
考题
单选题In a fixed displacement axial piston hydraulic motor, the speed is varied by（）A
regulating the ratio between torque and speed via the torque limiter at the motorB
directing the motor output flow through a bypass lineC
maintaining a constant flow and pressure inputD
controlling the input flow rate
考题
单选题Fuel injection uses the jet pump system and a Woodward type hydraulic （） is used to control engine speed.A
controllerB
governorC
instrumentD
apparatus
考题
单选题A diesel engine is equipped with an isochronous hydraulic governorA decrease in load will cause the engine speed to （）A
decrease onlyB
increase onlyC
decrease slightly then returned to original speedD
increase slightly then returned to original speed
考题
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)
考题
单选题If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.A
a low load on the unitB
a clogged pump suction strainerC
a blockage in the line between the pump and hydraulic motorD
the hydraulic motor turning too fast
考题
单选题In a four-stroke engines the camshaft rotates at （）.A
half the engine rotational speedB
twice the engine rotational speedC
the engine rotational speedD
four times the engine rotational speed
考题
单选题In a four-stroke/cycle diesel engine, the camshaft rotates at （）A
twice the crankshaft speedB
half the crankshaft speedC
the same speed as that of the crankshaftD
a speed independent of that of the crankshaft
热门标签
最新试卷