If one hydraulic pump of an electro-hydraulic steering unit fails, the vessel’s steering can be initially and best maintained by using the ______.A.trick wheelB.accumulatorC.standby pumpD.Telemotor
If one hydraulic pump of an electro-hydraulic steering unit fails, the vessel’s steering can be initially and best maintained by using the ______.
A.trick wheel
B.accumulator
C.standby pump
D.Telemotor
相关考题：
The follow-up gear on an electro-hydraulic steering gearA.relieves excessive fluid pressureB.takes the pump off stroke when the desired rudder angle is attainedC.allows for rudder movement faster than the movement of the shipsD.returns the rudder to amidships when the wheel is release
Dual electro-hydraulic steering units usually operate ______．A.With both pumps on line at the same timeB.With one pump on standbyC.With the follow-up gear disconnectedD.Only when the rudder is moved amidships
When the helm is turned on the navigation bridge，which of the listed actions will be the FIRST response in the steering room on a ship equipped with an electro-hydraulic steering gear ________．A.The pumps go to full strokeB.The six-way valve aligns itself with the running pumpC.Both port and starboard cables are energizedD.The synchronous receiver turns，duplicating the helm motion
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！
In an electro-hydraulic steering system, rudder movement is maitained in close synchronization with the steering wheel position by means of the ______.A.trick wheelB.follow-up controlC.six-way valveD.Rapson slide
单选题A vessel constrained by her draught shall，when risk of collision with another vessel in a crossing or head-on situation exists，（）.Aapply the relevant Steering and Sailing Rules as a power-driven vesselBapply the relevant Steering and Sailing Rules as a Sailing vesselCapply the relevant Steering and Sailing Rules as a vessel not under commandDapply the relevant Steering and Sailing Rules as a vessel engaged in a towing operation
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The test of a towing vessel’s steering gear control system includes each item EXCEPT（）.Aa test from the alternative power supply，if installedBtiming the movement of the rudder from hard over to hard overCverification that the rudder angle indicator shows the actual position of the rudder(s)Dvisual inspection of the steering linkage
单选题When the helm demands a 20°right rudder movement from an electro-hydraulic steering gear, which of the listed actions will be the FIRST action to happen when this rudder position is attained?（）AThe six-way valve opensBThe steering service pump motor is stoppedCThe follow-up gear takes the pump off strokeDThe cylinder relief valves bypass oil to the suction side the pump
单选题Air trapped in the hydraulic fluid of a steering system should be indicated by （）.Athe pump over-speedingBan improper rudder responseCbubbles in the sight glassDram relief valves lifting
单选题The purging of air from an elector-hydraulic steering gear unit is necessary when（）Achanging over to hand pump operationBengaging the trick wheelCthe system has been filled with new oilDthe rudder angle indicator does not match the helm position
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Certain requirements must currently be met by a ship’s steering system.There must be （）independent means of steering, although where two identical power units are provided, an auxiliary unit is not required.AoneBtwoCthreeDfour
单选题The control rod of a steering gear pump is attached at its outer end to （）.Athe hunting gearBthe rudder stockCthe rudder controllerDthe feedback unit
单选题Dual electro-hydraulic steering units usually operate （）.Awith both pumps on line at the same timeBwith one pump on standbyCwith the follow-up gear disconnectedDonly when the rudder is moved amidships
单选题If a severe leak develops in the electro-hydraulic steering gear unit is necessary when（）ALoss of vessel steeringBOverheating of the gyrocompassCJamming of the six-way valeDJamming of the follow-up device
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The follow-up gear on an electro-hydraulic steering gear（）Arelieves excessive fluid pressureBtakes the pump off stroke when the desired rudder angle is attainedCsynchronizes wheel position with the rudder positionDreturns the rudder to midposition when the wheel is released
单选题Which of the devices listed, when used on an electro-hydraulic steering gear, keeps the movement of the redder closely in step with the steering wheel?（）AThe follow-up gearBThe rudder angle indicatorCThe synchronous electric transmitterDA rudder angle limit switch
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In an electro-hydraulic steering system, under movement is maintained in close synchronization with the steering wheel position by means of the （）.Atrick-wheelBfollow-up controlCsix-way valveDRapson slide
单选题With reference to operating a four-ram steering gear system under emergency conditions, which one of the following statements is incorrect?（）AOnly one pump should be used at any timeBThe ship speed should be reduced to 70% of the normalCWatch keeping of the steering gear should be increasedDLimitations of the steering gear should be logged but the bridge need not be informed
单选题In an emergency，the electro-hydraulic steering units can be directly controlled by the（）.Atrick wheelBrapson slideCfollow-up gearDreceiver unit
单选题If one hydraulic pump of an electro-hydraulic steering unit falls, the vessels steering can be initially and best maintained by using the （）.Atrick wheelBaccumulatorCstandby pumpDtelemotor
单选题When there is no movement of the rams on an electro-hydraulic steering gear, the tilting box of the running pump is （）.Aset for maximum torqueBon the purge and vent strokeCin the neutral positionDrotating backwards
单选题On an electro-hydraulic steering gear, which of the listed devices will keep the rudder from over-traveling the bridge signal?（）ARudder angle indicatorBFollow-up gearCElectric transmitterDRudder angle limit switch