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水压力（hydraulic pressure）
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更多 “水压力（hydraulic pressure）” 相关考题
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
考题
Air trapped in the hydraulic fluid of a steering system may be indicated byA.the steering pumps overspeedingB.a jammed open relief valveC.a constantly occurring improper rudder responseD.excessive ram pressure
考题
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
考题
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
考题
The closing of the exhaust valves used on a modern, large, low-speed, main propulsion diesel engine may be directly provided by_______.A.large conical springsB.compressed air pressureC.hydraulic pressureD.exhaust gas pressure
考题
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
Hydraulic machinery failures are commonly caused by contamination of the hydraulic fluid and ______.A.fluid frictionB.fluid turbulenceC.component misalignmentD.pressure surges
考题
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
考题
A certificated lifeboatman assigned to command the lifeboat must ______.A.be the first individual to board the craftB.drain the hydraulic pressure before lowering the craftC.have a list of the persons assigned to the liftboatD.all of the above
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A marine diesel engine is started by（）A
supplying high pressure oil into a hydraulic motorB
supplying high temperature air into the cylinderC
supplying high pressure air into the cylinderD
electrical igniting
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Air trapped in the hydraulic fluid of a steering system may be indicated by（）A
the steering pumps overspeedingB
a jammed open relief valeC
a constantly occurring improper rudder responseD
excessive ram pressure
考题
单选题In a fixed displacement axial piston hydraulic motor, the speed is varied by（）A
regulating the ratio between torque and speed via the torque limiter at the motorB
directing the motor output flow through a bypass lineC
maintaining a constant flow and pressure inputD
controlling the input flow rate
考题
单选题Most hydraulic steering gears are fitted with relief valves which（）A
function when the rudder is amidshipsB
relieve excess whip pressure from the hydraulic oil systemC
protect the piping assembly from external rudder shockD
relieve excessive telemotor pressure
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If a hydraulic pump is overheating, the cause may be （）.A
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
考题
单选题Flexible hose under pressure in a hydraulic system will （）.A
tend to twist about its long axisB
expand in length and in diameterC
contract in length and expand in diameterD
flex at right angles to the applied pressure
考题
单选题Pressure 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 systems fluidD
solely by the charge applied by the accumulators
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The device used to store a charged pressure for a hydraulic starting system is called the（）A
reservoirB
hand pumpC
acceleratorD
accumulator
考题
单选题Which of the following hydraulic systems is not one of the three sub-division of the Hydraulic drive system?（）A
Constant pressure systemB
Variable pressure systemC
Variable displacement systemD
Constant volume system
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Hydraulic machinery failures are commonly caused by misalignment of the system components and by （）.A
hydraulic fluid contaminationB
excessive fluid frictionC
turbulent fluid flowD
fluid pressure surges
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
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