单选题Prior to running the hydraulic pump, examine the system carefully and ensure that the lever of control valves is in （） position.AneutralBendCopeningDclosure
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
neutral
B
end
C
opening
D
closure
参考解析
解析：
暂无解析
相关考题：
Before doing any work on a hydraulic system equipped with accumulators, you shouldA.drain the accumulators and purge with oxygenB.bleed off all stored energy from the accumulators completelyC.charge the accumulators to prevent system energy lossD.pump the hydraulic fluid into the accumulators to prevent fluid loss
After installing a new hydraulic pump in a system, what special attention should be given to the hydraulic system?A.The relief valves in the system should be readjustedB.The filters and strainers should be checked frequentlyC.All system pressure should be readjustedD.The system should be drained and renewed with a fluid of different operating characteristics
Before performing any maintenance on a hydraulic system storing energy in an accumulator, you shouldA.pressurize the system to test for leaksB.bleed off all pressure within the systemC.operate the machine until it reaches normal temperatureD.disconnect the pump pressure control switch
All of the following statements accurately describe process for administering file systems EXCEPT:() A.A logical volume must exist prior to running the crfs command to create a file systemB.A file system must be unmounted before it can be removedC.Defining a file system imposes a structure on a logical volumeD.Removing a file system using rmfs automatically removes the underling logical volume
Pressure drop in an operating hydraulic system is developed ______.A.only by the pump as its primary functionB.by resistance to the fluid flow through the systemC.by the thermal input to the system's fluidD.solely(单独地) by the charge applied by the accumulators
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
All of the following statements accurately describe process for administering file systems EXCEPT:（）A、A logical volume must exist prior to running the crfs command to create a file systemB、A file system must be unmounted before it can be removedC、Defining a file system imposes a structure on a logical volumeD、Removing a file system using rmfs automatically removes the underling logical volume
When an operator is trying to log off the system displays this message: you have running jobs?? What does this mean?（）A、One or more processes are running in the background, preventing log off.B、One or more processes are paused, requiring operator input prior to logging off.C、At least one process is running in the background and it will keep running after the operator logs offD、At least one process is running in the background using nohup and it will terminate when the operator logs off
单选题All of the following statements accurately describe process for administering file systems EXCEPT:（）AA logical volume must exist prior to running the crfs command to create a file systemBA file system must be unmounted before it can be removedCDefining a file system imposes a structure on a logical volumeDRemoving a file system using rmfs automatically removes the underling logical volume
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If the pump for a hydraulic anchor windlass is overheating, the cause may be （）.Aexcessive drive motor speedBexcessive pump discharge pressureCtoo low of a tilting box angleDinsufficient drive motor speed
单选题Overheating of a hydraulic system may be a result of （）.Achanging pump discharge pressure in response to normal load variationsBa high oil levelCincorrect fluid viscosityDcontinued slow re-circulation of the oil
单选题A variable displacement system of hydraulic drives consists of （）.Aa variable displacement axial piston pumpBa constant displacement axial piston pumpCa reciprocating piston pumpDa centrifugal pump
单选题After installing a new hydraulic pump in a system, what special attention should be given to the hydraulic system?（）AThe relief valves in the system should be readjustedBThe filters and strainers should be checked frequentlyCAll system pressure should be readjustedDThe system should be drained and renewed with a fluid of different operating characteristics
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If a hydraulic pump is overheating, the cause may be （）.Aexcessive internal leakage in the pumpBlow discharge pressure and fluid flowCexcessive fluid level in the hydraulic reservoirDoperation of the pump at 100% efficiency
单选题Leakage of hydraulic fluid from around the shaft of a hydraulic motor may be caused by（）Apermanent loss of pump suctionBworn shaft sealsChigh level in the oil sumpDlow motor RPM
单选题Prior to entering a cargo pump room, you should ensure that （）.Athe forced ventilating system is operatingBthe cargo pumps are securedCno monocarbon gases are presentDthe oily water separator is de-energized
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
单选题You have a server that runs Windows Server 2003 Service Pack 2 (SP2). An incremental backup runs every weekday at 01:00. On Friday, you examine the Windows Backup log and discover that the last entry in the log is one week old. You need to identify the problem that prevents the backup from running. What should you do? （）AFrom Scheduled Tasks, examine the log.BFrom Event Viewer, examine the system log.CFrom Windows Backup, enable detailed logging and then perform a manual backup.DFrom Windows Explorer, examine the files in the %systemroot%/system32/LogFiles folder.
单选题If the pump for a hydraulic anchor windlass is over heating, the cause may be （）.Aincreased pump speedBexcessive pump discharge pressureCtoo low of a tilting box angleDlow pump speed
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If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.Aa low load on the unitBa clogged pump suction strainerCa blockage in the line between the pump and hydraulic motorDthe hydraulic motor turning too fast