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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
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更多 “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” 相关考题
考题
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单选题When the desired rudder angle is attained by a typical double mm electro-hydraulic steering gear,the（）.A
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six-way valve shifts to the neutral flow positionC
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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
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考题
单选题The function of a centrifugal pump double volute casing is to （）.A
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double the liquid velocity through the pump when compared to a single voluteC
reduce hydraulic end thrustD
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考题
单选题Prior to running the hydraulic pump, examine the system carefully and ensure that the lever of control valves is in （） position.A
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endC
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考题
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In order for a fluid to be pumped, a fluid must be made to flowB
A substance must be cold in order for it to be pumpedC
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A pump must receive its energy from an external source
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The function of the hydraulic telemotor transmitter used in an electro-hydraulic steering gear system is to （）.A
transmit the rudder angle to the bridge indicatorB
prevent the control linkage from striking the stops when hard overC
automatically purge all entrained air from the systemD
send hydraulic signals to the receiving unit
考题
单选题If you are given the job of adding hydraulic fluid to a mooring winch, and are not certain as to the type of fluid to use, you should （）.A
add fluid that is the same color as the fluid in the reservoirB
add turbine oil because it is always a good substituteC
add any oil that has the same viscosity as the hydraulic fluidD
check the winch manufacturers instruction book
考题
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excessive internal leakage in the pumpB
low discharge pressure and fluid flowC
excessive fluid level in the hydraulic reservoirD
operation of the pump at 100% efficiency
考题
单选题In which of the listed hydraulic systems will the installation of an oil cooler be necessary?（）A
Constant tension mooring winch systemB
Hatch cover systemC
Watertight door systemD
Internal combustion engine hydraulic starter system
考题
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考题
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the four-way control valve failing to shiftB
the bleeder valve sticking in the open positionC
cold hydraulic fluidD
a clogged air vent falter on the oil reservoir
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tilting boxC
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考题
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reaction ringD
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考题
单选题An axial piston, variable stroke pump is used in a vessels hydraulic steering gearUnder pressure, oil continually leaks out from between the valve plate/cylinder barrel and will（）.A
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result in extreme damage to the pumpC
cause damage to the pump ff not continually drained from the pump casingD
result in the system high side pressure to substantially drop off
考题
单选题If the pump for a hydraulic anchor windlass is over heating, the cause may be （）.A
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low pump speed
考题
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that all personnel are seated in the craftB
that the cable has not jumped any grooves on the drumC
which way the wind is blowingD
the hydraulic fluid level before lifting
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
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(1) and (2)D
(1),(2)and(3)
考题
单选题As for a hydraulic single action vane pump, the inner wall of the stator is usually of （） shape.A
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ellipticalC
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hexagon
考题
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trick wheelB
accumulatorC
standby pumpD
telemotor
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The item（）is not the advantage of the hydraulic winch．A
less jerky startsB
less jerky stopsC
overheating worriesD
none of the overheating worries
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