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

题目
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

相似考题

1.Which two kinds of failures make the Data Recovery Advisor (DRA)generate a manual checklist? ()A. failures because a data file is renamed by errorB. failures when no standby database is configuredC. failures that require no archive logs to be applied for recoveryD. failures due to loss of connectivity-for example, an unplugged disk cable

2.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

3.Among the basic categories of equipment, which of the following are used to convert the hydraulic energy into linear motion?A.hydraulic pumpsB.valvesC.hydraulic cylindersD.hydraulic motors

4.Among the basic categories of equipment, which of the following are used to allow the hydraulic energy to be controlled?A.hydraulic pumpsB.valvesC.hydraulic cylindersD.hydraulic motors

更多“Hydraulic machinery failures are commonly caused by misalign”相关问题

  • 第1题：

    Among the basic categories of equipment, which of the following is used to convert hydraulic energy into continuous rotary motion?

    A.hydraulic pumps

    B.valves

    C.hydraulic cylinders

    D.hydraulic motors


    正确答案：D

  • 第2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

  • 第3题：

    The fire caused a lot of ________to the building and factory machinery.

    A.damage
    B.harm
    C.injury
    D.wound

    答案：A
    解析：
    本题考查近义词辨析。题目意为“火灾给建筑物和工厂的机器设备造成了巨大的损失。”各选项均有“伤害”之意，A项意为“损害，毁坏”，主要指对于物的损害，强调对于价值、用途、外观等所造成的损失。B项意为“危害，损害，伤害”，用于肉体或精神上的伤害均可。C项意为“伤害，受伤”，指损害健康、成就、容貌等，强调功能的损失。D项意为“伤口，创伤，伤害”，指枪伤、刀伤、刺伤等皮肉之伤，是出血的、严重的伤，特指战场上受伤，也可指人们精神上的创伤。本题目中“受伤的”主体是“建筑物和机器设备”，因此选A项。
    　　

  • 第4题：

    Are you testing the（）(液压舱盖)?

    • A、hydraulic hatch cover
    • B、hydraulic release unit
    • C、hydraulic oil jack
    • D、automatic hatch cover

    正确答案:A

  • 第5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6题：

    单选题
    Advection fog is most commonly caused by（）.
    A

    air being warmed above the dew point

    B

    saturation of cold air by rain

    C

    a rapid cooling of the air near the surface of the Earth at night

    D

    warm moist air being blown over a colder surface


    正确答案： A
    解析： 暂无解析

  • 第7题：

    单选题
    General, the best way for replacement of lamp is （）.
    A

    after the point is reached at which the failures begin to increase rapidly

    B

    before the point is reached at which the failures begin to increase rapidly

    C

    before the point is reached at which the failures begin to increase slowly

    D

    after the point is reached at which the failures begin to increase slowly


    正确答案： D
    解析： 暂无解析

  • 第8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9题：

    单选题
    External and internal leakage in hydraulic systems may be caused by （）.
    A

    unusual vibration

    B

    excessive worn parts

    C

    abnormal pressure

    D

    any of the above


    正确答案： D
    解析： 暂无解析

  • 第10题：

    单选题
    You executed the following commands in an RMAN session for your database instance that has failures: RMAN> LIST FAILURE; After some time, you executed the following command in the same session: RMAN> ADVISE FAILURE; But there are new failures recorded in the Automatic Diagnostic Repository (ADR) after the execution of the last LIST FAILURE command. Which statement is true for the above ADVISE FAILURE command in this scenario?（）
    A

    It produces a warning for new failures before advising for CRITICAL and HIGH failures.

    B

    It ignores new failures and considers the failures listed in the last LIST FAILURE command only.

    C

    It produces an error with recommendation to run the LIST FAILURE command before the ADVISE FAILURE command.

    D

    It produces advice only for new failures and the failures listed in the last LIST FAILURE command are ignored.


    正确答案： C
    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
    Deck machinery, which is also known as hull machinery, includes all power driven equipment located （）the machinery spaces that is （） with the main propulsion plant.
    A

    inside；associated

    B

    inside；not associated

    C

    outside；associated

    D

    outside；not associated


    正确答案： C
    解析： 暂无解析

  • 第13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：B

  • 第14题：

    Advection fog is most commonly caused by ______.

    A.air being warmed above the dew point

    B.saturation of cold air by rain

    C.a rapid cooling of the air near the surface of the Earth at night

    D.warm moist air being blown over a colder surface


    正确答案：D
    平流雾最普遍产生于温暖潮湿的空气吹过较冷的水面。

  • 第15题：

    Loop guard and UniDirectional Link Detection both protect against Layer 2 STP loops. In which two ways does loop guard differ from UDLD in loop detection and prevention？（）

    • A、Loop guard can be used with root guard simultaneously on the same port on the same VLAN while UDLD cannot.
    • B、UDLD protects against STP failures caused by cabling problems that create one-way links.
    • C、Loop guard detects and protects against duplicate packets being received and transmitted on different ports.
    • D、UDLD protects against unidirectional cabling problems on copper and fiber media.
    • E、Loop guard protects against STP failures caused by problems that result in the loss of BPDUs from a designated switch port.

    正确答案:B,E

  • 第16题：

    Which two kinds of failures make the Data Recovery Advisor (DRA)generate a manual checklist? （）

    • A、failures because a data file is renamed by error
    • B、failures when no standby database is configured
    • C、failures that require no archive logs to be applied for recovery
    • D、failures due to loss of connectivity-for example, an unplugged disk cable

    正确答案:A,D

  • 第17题：

    单选题
    Strainers are commonly used in hydraulic systems to （）.
    A

    protect the pump from fine soluble contaminants

    B

    prevent solid particles from entering the pump

    C

    prevent solid particles from entering the filter

    D

    protect the directional control valves


    正确答案： D
    解析： 暂无解析

  • 第18题：

    多选题
    Loop guard and UniDirectional Link Detection both protect against Layer 2 STP loops. In which two ways does loop guard differ from UDLD in loop detection and prevention？ （）
    A

    Loop guard can be used with root guard simultaneously on the same port on the same VLAN while UDLD cannot

    B

    UDLD protects against STP failures caused by cabling problems that create one-way links.

    C

    Loop guard detects and protects against duplicate packets being received and transmitted on different ports

    D

    UDLD protects against unidirectional cabling problems on copper and fiber media.

    E

    Loop guard protects against STP failures caused by problems that result in the loss of BPDUs from a designated switch port.


    正确答案： D,E
    解析： 暂无解析

  • 第19题：

    单选题
    Electrical failures in motors are caused by the breakdown of insulation, which may be caused by （）
    A

    penetration of moisture

    B

    accumulation of dirt

    C

    overheating

    D

    All of the above


    正确答案： A
    解析： 暂无解析

  • 第20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21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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