单选题An orifice-check valve placed in a hydraulic system is used to（）Aregulate the fluid flow in either directionBrestrict movement of hydraulic fluid in one direction, but allow free movement in the other directionCallow free movement of hydraulic fluid in both directionsDallow a restricted fluid flow in one direction only
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
参考解析
解析：
暂无解析
相关考题：
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
What type of valve is used to direct the flow of hydraulic fluid?A.relief valveB.direction control valveC.stop valveD.pressure control valve
Which of the following can be used in hydraulic transmission system?A.Hydraulic oilB.Animal oilC.Light oilD.Fuel oil
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！
单选题Which of the listed pressure control valves would be used to establish the maximum operating pressure of a hydraulic system?（）APressure-reducing valveBUnloading valveCCounterbalance valveDPressure-relief valve
单选题（）can be used to prevent hydraulic system overloaded or keep the pressure of oil outlet from pump constant.AOverflow valveBReducing valveCBalancing valveDReducing valve or balancing valve
单选题Hydraulic control check value is generally used to （） in the marine hydraulic mechanism.Acontrol the back pressure of return oilBlock the oil lines under some conditionsCchange the direction of oil flowDact as relief valve
单选题Which of the valves listed is NOT considered to be a hydraulic system directional control valve?（）ASpring-centered valveBUnloading valveCThree-position valveDTwo-position valve
单选题A reservoir, as used in hydraulic systems aboard ship, is used to store hydraulic oilAnother function is to（）Aact as a shock absorberBmaintain the stored oil under pressureCact as a base or foundation for the power unitDeliminate pressure surges in the system
单选题（） play a very important part in hydraulic systems by preventing interaction between different parts of the hydraulic circuit.AMotorsBCheck valvesCSafety valvesDReducing valve
单选题Increased internal leakage, in addition to poor hydraulic system response,and inadequate lubrication, is the result of （）.Apump bearings in poor conditionBexcessively worn actuator-piston packingCbroken directional control valve centering springsDlow hydraulic oil viscosity
单选题What type of valve is used to direct the flow of hydraulic fluid?（）ARelief valveBDirection control valveCStop valveDPressure control valve
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（）.Adamage from crane operationsBbeing used for wash down purposesCaccidental diversion of flow to wrong locationDfreezing
单选题In a hydraulic system, （） are used to protect the system from over pressure.Astop valvesBcheck valvesCsafety valvesDreducing valves
单选题Which of the following statements concerning butterfly valves is correct?（）ASpecial tools are required for lapping or grindingBIt is impossible to throttle flow with a butterfly valveCTo close the valve, it is only necessary to turn the handle a quarter of a turnDThe butterfly valve should never be used in a freshwater system
单选题Which of the following can be used in hydraulic transmission system?（）AHydraulic oilBAnimal oilCLight oilDFuel oil
单选题The function of the hydraulic telemotor transmitter used in an electro-hydraulic steering gear system is to （）.Atransmit the rudder angle to the bridge indicatorBprevent the control linkage from striking the stops when hard overCautomatically purge all entrained air from the systemDsend hydraulic signals to the receiving unit
单选题The mechanical exhaust valve operation system is replaced by（）in an electronic controlled ME engine.Aa system with a Hydraulic Power Supply (HPS) unitBa system with roller guides for exhaust valvesCa system with an electronically controlled Alpha LubricatorDa system directly powered by electric motor
单选题Diesel engine air start valve timing is controlled by（）Aengine operating speedBan air manifoldCa hydraulic distributorDindividual cams and valve gear
单选题An orifice-check valve placed in a hydraulic system is used to（）Aregulate the fluid flow in either directionBrestrict movement of hydraulic fluid in one direction, but allow free movement in the other directionCallow free movement of hydraulic fluid in both directionsDallow a restricted fluid flow in one direction only
单选题When normal operating pressure is applied to the hydraulic oil used in a high-pressure system, the oil （）.Aviscosity will decreaseBvolume will increaseCvolume will decreaseDpour point will be reduced
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?（）AThe reservoir would become vapor boundBThe valve would be placed in hydraulic lockCThe spring loaded relief ports would openDThe buffering chambers would be unable to function
单选题In an electro-hydraulic steering gear system, when will the variable displacement pump be placed on stroke?（）AWhen the helm is at any angle other than amidshipsBWhen the six-way valve is openedCWhen the ram relief valves liftDWhen the redder angle is different from the position of the helm
单选题A gradual decrease in the discharge pressure of an operating hydraulic pump can be caused by （）.Athe four-way control valve failing to shiftBthe bleeder valve sticking in the open positionCcold hydraulic fluidDa clogged air vent falter on the oil reservoir
单选题Which of the following statements describes the functions of a reservoir used in a hydraulic system?（）ADissipate heatBTrap foreign matterCSeparate air from the oilDAll of the above
单选题Which of the following types of hydraulic pumps would be used in a steering system?（）ALobeBScrewCRadial pistonDVolute
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（）.Acause loss of hydraulic oil from the systemBresult in extreme damage to the pumpCcause damage to the pump ff not continually drained from the pump casingDresult in the system high side pressure to substantially drop off
单选题Fuel injection uses the jet pump system and a Woodward type hydraulic （） is used to control engine speed.AcontrollerBgovernorCinstrumentDapparatus