Hydraulic machinery failures are commonly caused by contamination of the hydraulic fluid and ______.A.fluid frictionB.fluid turbulenceC.component misalignmentD.pressure surges

题目

Hydraulic machinery failures are commonly caused by contamination of the hydraulic fluid and ______.

A.fluid friction

B.fluid turbulence

C.component misalignment

D.pressure surges

相似考题

1.Overheating of the hydraulic fluid in an electro-hydraulic anchor windlass can result from a/an( ).A.overload on the pump motorB.low fluid level in the reservoirC.low fluid viscosity around the shaft sealD.high oil level in the sump

2.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

3.Leakage of hydraulic fluid from around the shaft of a hydraulic motor may be caused by ______.A.permanent loss of pump suctionB.worn shaft sealsC.high level in the oil sumpD.low motor RPM

4.If you install a new hydraulic hose in a hydraulic system, the hose must be long enough to allow for contraction to preventA.failure of the hydraulic hoseB.excessive flow through the lineC.friction in other areas of the hydraulic systemD.overheating of the hydraulic fluid

更多“Hydraulic machinery failures are commonly caused by contamination of the hydraulic fluid a ”相关问题

  • 第1题：

    The major cause of trouble in a mechanical-hydraulic governor is contamination of the hydraulic fluid by ______.

    A.dirt

    B.fuel oil

    C.governor cooling water

    D.fuel oil tar(焦油)


    正确答案：A

  • 第2题：

    A hydraulic accumulator aboard a ship is designed to ______.

    A.store fluid under pressure

    B.act as a fluid reservoir

    C.provide overpressure relief

    D.replenish fluid to a system


    正确答案：A
    船上的液体储存器被设计为用来储存液体的压力之下。

  • 第3题：

    单选题
    What type of valve is used to direct the flow of hydraulic fluid?（）
    A

    Relief valve

    B

    Direction control valve

    C

    Stop valve

    D

    Pressure control valve


    正确答案： D
    解析： 暂无解析

  • 第4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5题：

    单选题
    A hydraulic accumulator aboard a ship is designed to（）.
    A

    store fluid under pressure

    B

    act as a fluid reservoir

    C

    provide overpressure relief

    D

    replenish fluid to a system


    正确答案： C
    解析： 暂无解析

  • 第6题：

    单选题
    Before doing any work on a hydraulic system equipped with accumulators, you should（）
    A

    drain the accumulators and purge with oxygen

    B

    bleed off all stored energy from the accumulators completely

    C

    charge the accumulators to prevent system energy loss

    D

    pump the hydraulic fluid into the accumulators to prevent fluid loss


    正确答案： B
    解析： 暂无解析

  • 第7题：

    单选题
    The major cause of trouble in a mechanical-hydraulic governor is contamination of the hydraulic fluid by （）
    A

    dirt

    B

    fuel oil

    C

    governor cooling water

    D

    fuel oil tars


    正确答案： A
    解析： 暂无解析

  • 第8题：

    单选题
    Leakage of hydraulic fluid from around the shaft of a hydraulic motor may be caused by（）
    A

    permanent loss of pump suction

    B

    worn shaft seals

    C

    high level in the oil sump

    D

    low motor RPM


    正确答案： A
    解析： 暂无解析

  • 第9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10题：

    单选题
    A hydraulic accumulator is designed to（）.
    A

    store fluid under pressure

    B

    act as a fluid reservoir

    C

    provide overpressure relief

    D

    replenish fluid to a system


    正确答案： A
    解析： 暂无解析

  • 第11题：

    单选题
    In a shell-and-tube type hydraulic fluid cooler, the amount of heat transferred from the hydraulic fluid to the cooling water depends upon（）
    A

    the temperature of the hydraulic fluid

    B

    the flow rate of the hydraulic fluid

    C

    the temperature of the cooling water

    D

    all of the above


    正确答案： A
    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：

    The storage device for nitrogen-pressurized hydraulic fluid，which is used in closing the blowout preventers is called the ______．

    A.Actuator

    B.Annulus

    C.Accumulator

    D.Annular preventer


    正确答案：C

  • 第14题：

    单选题
    Hydraulic pumps most commonly used in steering systems are of the （）.
    A

    lobe type

    B

    screw type

    C

    axial piston type

    D

    volute type


    正确答案： C
    解析： 暂无解析

  • 第15题：

    单选题
    In the design of hydraulic piping and equipment consideration is given to minimize turbulence in the hydraulic fluid, as this will cause（）
    A

    molecular fluid vibration

    B

    energy losses

    C

    wide pressure variations

    D

    mechanical damage to control valves


    正确答案： A
    解析： 暂无解析

  • 第16题：

    单选题
    The most common contaminate of governor hydraulic fluid is （）.
    A

    moisture

    B

    dirt

    C

    acid

    D

    air


    正确答案： B
    解析： 暂无解析

  • 第17题：

    单选题
    If you are given the job of adding hydraulic fluid to a mooring winch, and are not certain as to the type of fluid to use, you should （）.
    A

    add fluid that is the same color as the fluid in the reservoir

    B

    add turbine oil because it is always a good substitute

    C

    add any oil that has the same viscosity as the hydraulic fluid

    D

    check the winch manufacturers instruction book


    正确答案： C
    解析： 暂无解析

  • 第18题：

    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


    正确答案： C
    解析： 暂无解析

  • 第19题：

    单选题
    （） are commonly used in mechanical-hydraulic governor（调速器） to sense engine speeds.
    A

    Bulbs

    B

    Bulks

    C

    Flyweights

    D

    Flywheels


    正确答案： B
    解析： 暂无解析

  • 第20题：

    单选题
    How can the chance of contaminating hydraulic fluid be decreased when working on hydraulic system?（）
    A

    clean the fittings before they are disconnected

    B

    Place drip pans under leaky fittings

    C

    Seal any cracks in lines with Permatex

    D

    Coat all threads with graphite oil


    正确答案： A
    解析： 暂无解析

  • 第21题：

    单选题
    Compensated flow control or constant flow valves are used in hydraulic systems to（）
    A

    compensate for major leaks in the system

    B

    maintain the original fluid viscosity

    C

    allow for changes in pressure and temperature within the system

    D

    assure constant fluid temperature


    正确答案： D
    解析： 暂无解析

  • 第22题：

    单选题
    Hydraulic machinery failures are commonly caused by contamination of the hydraulic fluid and （）.
    A

    fluid friction

    B

    fluid turbulence

    C

    component misalignment

    D

    pressure surges


    正确答案： C
    解析： 暂无解析

  • 第23题：

    单选题
    The most common forms of main drive used on deck auxiliaries are （）.
    A

    steam plants, electric motors and compressed air

    B

    diesel engine, hydraulic machinery and compressed air

    C

    steam plants, electric motors and hydraulic machinery

    D

    diesel engines, steam plants and hydraulic machinery


    正确答案： D
    解析： 暂无解析

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