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单选题
An orifice-check valve placed in a hydraulic system is used to（）
A
regulate the fluid flow in either direction
B
restrict movement of hydraulic fluid in one direction, but allow free movement in the other direction
C
allow free movement of hydraulic fluid in both directions
D
allow a restricted fluid flow in one direction only
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更多 “单选题An orifice-check valve placed in a hydraulic system is used to（）A regulate the fluid flow in either directionB restrict movement of hydraulic fluid in one direction, but allow free movement in the other directionC allow free movement of hydraulic fluid in both directionsD allow a restricted fluid flow in one direction only” 相关考题
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Which of the listed pressure control valves would be used to establish the maximum operating pressure of a hydraulic system?A.Pressure-reducing valveB.Unloading valveC.Counterbalance valveD.Pressure-relief valve
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What type of valve is used to direct the flow of hydraulic fluid?A.relief valveB.direction control valveC.stop valveD.pressure control valve
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Which of the following can be used in hydraulic transmission system?A.Hydraulic oilB.Animal oilC.Light oilD.Fuel oil
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材料：At 1800，the hydraulic steering system failed once again．The master realized he would require shore assistance to rectify the problem，and diverted towards Portland using the thruster to steer by．The weather at this time was south-south-west force 5．At about three hours later，the thruster drive unit failed due to a leaking fuel injector pipe on the power unit．This was replaced using the spare carried on board．Immediately following the engine restart，an adjacent fuel line failed causing shut down of the unit．With no fuel line spares available，the thruster power unit could not be used．The failure of this unit，and that of the main hydraulic steering system，left the vessel without any steering capability．At 2155，with the weather deteriorating and no steering，the master contacted the Portland Coastguard and a“Pan pan”message was broadcast．A tow to Portland Harbor was arranged and she arrived alongside at 0240 the following morning．The subsequent investigation found that the main hydraulic steering system failure was due to a seized shuttle valve in the main hydraulic solenoid valve block．The solenoid valve had been recently overhauled．It was thought that the“O”rings fitted to the shuttle valve were of either the wrong type or a defective one．The valve had seized in such a position that hydraulic pressure by-passed the system preventing use of the hand steering．问题：The vessel was steered by thruster because ________ failed．A.the hydraulic steering systemB.the solenoid valveC.the thruster driving unitD.the hand steeringThe time that the thruster drive unit failed was ________ hrs．A.1800B.2100C.2155D.0240When the hydraulic steering system failed，________．A.the hand steering system could still be usedB.the auto steering system could still be usedC.both hand and auto steering system were out of useD.neither and steering system nor auto steering system was out of useThe real reason that caused the hydraulic steering system to fail was that ________．A.no fuel line spare were availableB.the weather was deterioratingC.the“O”rings fitted to the shuttle valve were of either the wrong type or a defective oneD.the thruster power unit failed请帮忙给出每个问题的正确答案和分析，谢谢！
考题
单选题Which of the listed pressure control valves would be used to establish the maximum operating pressure of a hydraulic system?（）A
Pressure-reducing valveB
Unloading valveC
Counterbalance valveD
Pressure-relief valve
考题
单选题（）can be used to prevent hydraulic system overloaded or keep the pressure of oil outlet from pump constant.A
Overflow valveB
Reducing valveC
Balancing valveD
Reducing valve or balancing valve
考题
单选题Hydraulic control check value is generally used to （） in the marine hydraulic mechanism.A
control the back pressure of return oilB
lock the oil lines under some conditionsC
change the direction of oil flowD
act as relief valve
考题
单选题Which of the valves listed is NOT considered to be a hydraulic system directional control valve?（）A
Spring-centered valveB
Unloading valveC
Three-position valveD
Two-position valve
考题
单选题A reservoir, as used in hydraulic systems aboard ship, is used to store hydraulic oilAnother function is to（）A
act as a shock absorberB
maintain the stored oil under pressureC
act as a base or foundation for the power unitD
eliminate pressure surges in the system
考题
单选题（） play a very important part in hydraulic systems by preventing interaction between different parts of the hydraulic circuit.A
MotorsB
Check valvesC
Safety valvesD
Reducing valve
考题
单选题Increased internal leakage, in addition to poor hydraulic system response,and inadequate lubrication, is the result of （）.A
pump bearings in poor conditionB
excessively worn actuator-piston packingC
broken directional control valve centering springsD
low hydraulic oil viscosity
考题
单选题What type of valve is used to direct the flow of hydraulic fluid?（）A
Relief valveB
Direction control valveC
Stop valveD
Pressure control valve
考题
单选题A cutoff valve in the fire-main system of a ship may be closed to protect the portion of the system on an exposed deck from（）.A
damage from crane operationsB
being used for wash down purposesC
accidental diversion of flow to wrong locationD
freezing
考题
单选题In a hydraulic system, （） are used to protect the system from over pressure.A
stop valvesB
check valvesC
safety valvesD
reducing valves
考题
单选题Which of the following statements concerning butterfly valves is correct?（）A
Special tools are required for lapping or grindingB
It is impossible to throttle flow with a butterfly valveC
To close the valve, it is only necessary to turn the handle a quarter of a turnD
The butterfly valve should never be used in a freshwater system
考题
单选题Which of the following can be used in hydraulic transmission system?（）A
Hydraulic oilB
Animal oilC
Light oilD
Fuel oil
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The mechanical exhaust valve operation system is replaced by（）in an electronic controlled ME engine.A
a system with a Hydraulic Power Supply (HPS) unitB
a system with roller guides for exhaust valvesC
a system with an electronically controlled Alpha LubricatorD
a system directly powered by electric motor
考题
单选题Diesel engine air start valve timing is controlled by（）A
engine operating speedB
an air manifoldC
a hydraulic distributorD
individual cams and valve gear
考题
单选题An orifice-check valve placed in a hydraulic system is used to（）A
regulate the fluid flow in either directionB
restrict movement of hydraulic fluid in one direction, but allow free movement in the other directionC
allow free movement of hydraulic fluid in both directionsD
allow a restricted fluid flow in one direction only
考题
单选题When normal operating pressure is applied to the hydraulic oil used in a high-pressure system, the oil （）.A
viscosity will decreaseB
volume will increaseC
volume will decreaseD
pour point will be reduced
考题
单选题Which of the following problems will occur if the internal drain at either end of a hydraulic, two-way, spool-type directional control valve cylinder were to become plugged?（）A
The reservoir would become vapor boundB
The valve would be placed in hydraulic lockC
The spring loaded relief ports would openD
The buffering chambers would be unable to function
考题
单选题In an electro-hydraulic steering gear system, when will the variable displacement pump be placed on stroke?（）A
When the helm is at any angle other than amidshipsB
When the six-way valve is openedC
When the ram relief valves liftD
When the redder angle is different from the position of the helm
考题
单选题A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.A
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
考题
单选题Which of the following statements describes the functions of a reservoir used in a hydraulic system?（）A
Dissipate heatB
Trap foreign matterC
Separate air from the oilD
All of the above
考题
单选题Which of the following types of hydraulic pumps would be used in a steering system?（）A
LobeB
ScrewC
Radial pistonD
Volute
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
cause loss of hydraulic oil from the systemB
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Fuel injection uses the jet pump system and a Woodward type hydraulic （） is used to control engine speed.A
controllerB
governorC
instrumentD
apparatus
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