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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 accumul

题目

Pressure drop in an operating hydraulic system is developed ______.

A.only by the pump as its primary function

B.by resistance to the fluid flow through the system

C.by the thermal input to the system's fluid

D.solely(单独地) by the charge applied by the accumulators

相似考题

1.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

2.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

3.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

4.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

更多“Pressure drop in an operating hydraulic system is developed ______.A.only by the pump as i ”相关问题

  • 第1题：

    Which of the following problems may be encountered by using an oil having a viscosity higher than that specified for an operating hydraulic system?

    A.External seal leakage

    B.Hunting due to fast response

    C.Hydraulic oil film breakdown

    D.Increased power consumption


    正确答案：D

  • 第2题：

    单选题
    （）can be used to prevent hydraulic system overloaded or keep the pressure of oil outlet from pump constant.
    A

    Overflow valve

    B

    Reducing valve

    C

    Balancing valve

    D

    Reducing valve or balancing valve


    正确答案： D
    解析： 暂无解析

  • 第3题：

    单选题
    Overheating of a hydraulic system may be a result of （）.
    A

    changing pump discharge pressure in response to normal load variations

    B

    a high oil level

    C

    incorrect fluid viscosity

    D

    continued slow re-circulation of the oil


    正确答案： C
    解析： 暂无解析

  • 第4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 system

    B

    Variable pressure system

    C

    Variable displacement system

    D

    Constant volume system


    正确答案： D
    解析： 暂无解析

  • 第5题：

    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


    正确答案： C
    解析： 暂无解析

  • 第6题：

    单选题
    In a hydraulic system, （） are used to protect the system from over pressure.
    A

    stop valves

    B

    check valves

    C

    safety valves

    D

    reducing valves


    正确答案： B
    解析： 暂无解析

  • 第7题：

    单选题
    If a hydraulic pump is overheating, the cause may be （）.
    A

    excessive internal leakage in the pump

    B

    low discharge pressure and fluid flow

    C

    excessive fluid level in the hydraulic reservoir

    D

    operation of the pump at 100% efficiency


    正确答案： C
    解析： 暂无解析

  • 第8题：

    单选题
    The purpose of the refrigeration system low pressure cutout switch is to （）
    A

    protect the compressor from liquid flood back

    B

    protect the compressor from low discharge pressure

    C

    start and stop the compressor upon system demand

    D

    start the compressor after a drop in the evaporator pressure


    正确答案： B
    解析： 暂无解析

  • 第9题：

    单选题
    Flexible hose under pressure in a hydraulic system will （）.
    A

    tend to twist about its long axis

    B

    expand in length and in diameter

    C

    contract in length and expand in diameter

    D

    flex at right angles to the applied pressure


    正确答案： C
    解析： 暂无解析

  • 第10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 system

    B

    result in extreme damage to the pump

    C

    cause damage to the pump ff not continually drained from the pump casing

    D

    result in the system high side pressure to substantially drop off


    正确答案： A
    解析： 暂无解析

  • 第11题：

    单选题
    The device used to store a charged pressure for a hydraulic starting system is called the（）
    A

    reservoir

    B

    hand pump

    C

    accelerator

    D

    accumulator


    正确答案： C
    解析： 暂无解析

  • 第12题：

    单选题
    Hydraulic machinery failures are commonly caused by misalignment of the system components and by （）.
    A

    hydraulic fluid contamination

    B

    excessive fluid friction

    C

    turbulent fluid flow

    D

    fluid pressure surges


    正确答案： C
    解析： 暂无解析

  • 第13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 valve

    B

    Unloading valve

    C

    Counterbalance valve

    D

    Pressure-relief valve


    正确答案： C
    解析： 暂无解析

  • 第14题：

    单选题
    Air trapped in the hydraulic fluid of a steering system should be indicated by （）.
    A

    the pump over-speeding

    B

    an improper rudder response

    C

    bubbles in the sight glass

    D

    ram relief valves lifting


    正确答案： C
    解析： 暂无解析

  • 第15题：

    单选题
    Pressure in an operating hydraulic system is developed （）.
    A

    only by the pump as its primary function

    B

    by resistance to the fluid flow through the system

    C

    by the thermal input to the systems fluid

    D

    solely by the charge applied by the accumulators


    正确答案： A
    解析： 暂无解析

  • 第16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 absorber

    B

    maintain the stored oil under pressure

    C

    act as a base or foundation for the power unit

    D

    eliminate pressure surges in the system


    正确答案： C
    解析： 暂无解析

  • 第17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 readjusted

    B

    The filters and strainers should be checked frequently

    C

    All system pressure should be readjusted

    D

    The system should be drained and renewed with a fluid of different operating characteristics


    正确答案： A
    解析： 暂无解析

  • 第18题：

    单选题
    Hydraulically, servo-operated, automatic, change over valves, utilized in a two ram hydraulic steering gear, serve to（）
    A

    allow an alternate main pump to start in the fully loaded condition thus developing immediate full torque

    B

    prevent either main pump from being hydraulically motored when idle by cross pressure flow

    C

    prevent both units from operating simultaneously which could result in doubling the flow of oil and pressure leading to over pressurization of the system

    D

    all of the above


    正确答案： D
    解析： 暂无解析

  • 第19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 decrease

    B

    volume will increase

    C

    volume will decrease

    D

    pour point will be reduced


    正确答案： C
    解析： 暂无解析

  • 第20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 shift

    B

    the bleeder valve sticking in the open position

    C

    cold hydraulic fluid

    D

    a clogged air vent falter on the oil reservoir


    正确答案： C
    解析： 暂无解析

  • 第21题：

    单选题
    Pump up the starting air reservoirs to their maximum pressure and （）the air reservoirs and air system.
    A

    open

    B

    close

    C

    drain

    D

    vent


    正确答案： C
    解析： 暂无解析

  • 第22题：

    单选题
    Fuel injection uses the jet pump system and a Woodward type hydraulic （） is used to control engine speed.
    A

    controller

    B

    governor

    C

    instrument

    D

    apparatus


    正确答案： D
    解析： 暂无解析

  • 第23题：

    单选题
    If the relief valve on the discharge side of a hydraulic pump lifts, the cause could be （）.
    A

    a low load on the unit

    B

    a clogged pump suction strainer

    C

    a blockage in the line between the pump and hydraulic motor

    D

    the hydraulic motor turning too fast


    正确答案： C
    解析： 暂无解析

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