When a cargo boom or crane is rated at varying capacities，there will be a table at the controls which relates safe working load to ______．A.winch speedB.boom strengthC.load radiusD.cable strength

题目

When a cargo boom or crane is rated at varying capacities，there will be a table at the controls which relates safe working load to ______．

A.winch speed

B.boom strength

C.load radius

D.cable strength

相似考题

1.On a crane, the boom indicator tells the operator what angle the boom angle is compared to the ______.A.vertical positionB.horizontal positionC.boom stop angleD.minimum radius angle

2.Which statement(s) is/are TRUE concerning crane cargo operations?A.Do not exceed rated load capacity of crane and container spreader or slingsB.During any cargo handling operation，the safety of personnel is paramountC.Cargo handlers must be outfitted with adequate protection from personal injuryD.All the above

3.With a given load on the cargo hook，tension in a single span topping lift ______.A.increases as the boom's angle to the horizontal increasesB.is at a maximum when the boom is at a 45° angle to the horizontalC.increases as the boom's angle to the horizontal decreasesD.decreases as the boom's angle to the horizontal decreases

4.The boom stops are installed on an offshore crane to ______.A.prevent the boom from being raised too highB.prevent the boom from swingingC.support the boom when not in useD.prevent the boom from being lowered

更多“When a cargo boom or crane is rated at varying capacities,there will be a table at the con ”相关问题

  • 第1题：

    With a given load on the cargo hook，the thrust on a cargo boom ______.

    A.increases as the angle to the horizontal increases

    B.increases as the angle to the horizontal decreases

    C.is greatest at an angle of 45° and decreases as the boom is raised or lowered

    D.is least at an angle of 45° and increases as the boom is raised or lowered


    正确答案：A

  • 第2题：

    Which statement is FALSE regarding the operation of a crane ________．

    A.The crane jib is raised and lowered by the luffing winch

    B.The cargo block is raised and lowered by the hoisting winch

    C.The cargo block is raised and lowered by the luffing winch

    D.None of the above


    正确答案：C

  • 第3题：

    What does “evel-luffing” accomplish during crane operations ________．

    A.It prevents the load from swinging when the boom level is adjusted

    B.Less power is needed when topping the boom with a load on the hook

    C.It maintains the height of the load above the deck

    D.All of the above


    正确答案：D

  • 第4题：

    A （）can give power to hoist or lower cargo.

    • A、cargo winch
    • B、lift winch
    • C、derrick
    • D、crane

    正确答案:A

  • 第5题：

    单选题
    For any given pedestal crane,when the boom is lengthened, the lifing capacity is（）.
    A

    unchanged

    B

    increased

    C

    eliminated

    D

    decreased


    正确答案： D
    解析： 暂无解析

  • 第6题：

    单选题
    The boom stops on a pedestal crane prevent the boom from（）.
    A

    being raised too high

    B

    swinging at sea

    C

    overloading when not in use

    D

    being lowered too low


    正确答案： A
    解析： 暂无解析

  • 第7题：

    单选题
    Which statement(s) is/are TRUE concerning crane cargo operations? （）
    A

    Do not exceed rated load capacity of crane and container spreader or slings

    B

    During any cargo handling operation，the safety of personnel is paramount

    C

    Cargo handlers must be outfitted with adequate protection from personal injury

    D

    All the above


    正确答案： C
    解析： 暂无解析

  • 第8题：

    单选题
    When a cargo boom or crane is rated at varying capacities，there will be a table at the controls which relates safe working load to（）.
    A

    winch speed

    B

    boom strength

    C

    load radius

    D

    cable strength


    正确答案： B
    解析： 暂无解析

  • 第9题：

    单选题
    For a given weight of cargo，the stress on the heel block of a cargo boom（）.
    A

    increases as the cargo closes the head while hoisting

    B

    increases if the cargo runner is doubled up

    C

    decreases as the boom is topped to a greater angle

    D

    is determined by the thrust stresses on the boom


    正确答案： B
    解析： 暂无解析

  • 第10题：

    单选题
    With a given load on the cargo hook，the thrust on a cargo boom（）.
    A

    increases as the angle to the horizontal increases

    B

    increases as the angle to the horizontal decreases

    C

    is greatest at an angle of 45° and decreases as the boom is raised or lowered

    D

    is least at an angle of 45° and increases as the boom is raised or lowered


    正确答案： B
    解析： 暂无解析

  • 第11题：

    单选题
    What does “evel-luffing” accomplish during crane operations（）.
    A

    It prevents the load from swinging when the boom level is adjusted

    B

    Less power is needed when topping the boom with a load on the hook

    C

    It maintains the height of the load above the deck

    D

    All of the above


    正确答案： D
    解析： 暂无解析

  • 第12题：

    单选题
    The boom indicator on a crane will indicate the（）.
    A

    length of the boom

    B

    angle of the boom

    C

    lifting capacity of the boom

    D

    direction of the boom


    正确答案： B
    解析： 暂无解析

  • 第13题：

    The boom stops on a pedestal crane prevent the boom from ______.

    A.being raised too high

    B.swinging at sea

    C.overloading when not in use

    D.being lowered too low


    正确答案：A

  • 第14题：

    For any given pedestal crane，when the boom is lengthened，the lifting capacity is ______．

    A.unchanged

    B.increased

    C.eliminated

    D.decreased


    正确答案：D

  • 第15题：

    What is meant by the term“luffing the boom”of a crane ________．

    A.Stopping the boom

    B.Topping or lowering the boom

    C.Moving the boom left or right

    D.All of the above


    正确答案：B

  • 第16题：

    单选题
    The （）(笨重货) must be handled by jumbo boom or shore crane.
    A

    awkward cargo

    B

    drummed cargo

    C

    cased cargo

    D

    heavy cargo


    正确答案： D
    解析： 暂无解析

  • 第17题：

    单选题
    The signal man assisting a crane operator has his arm extended with his fingers closed and thumb pointing upward. This is the signal to（）.
    A

    raise the boom

    B

    raise the hook

    C

    raise the boom and hook

    D

    check the boom stop


    正确答案： B
    解析： 暂无解析

  • 第18题：

    单选题
    What is meant by the term“luffing the boom”of a crane（）．
    A

    Stopping the boom

    B

    Topping or lowering the boom

    C

    Moving the boom left or right

    D

    All of the above


    正确答案： C
    解析： 暂无解析

  • 第19题：

    单选题
    The boom stops are installed on an offshore crane to（）.
    A

    prevent the boom from being raised too high

    B

    prevent the boom from swinging

    C

    support the boom when not in use

    D

    prevent the boom from being lowered


    正确答案： C
    解析： 暂无解析

  • 第20题：

    单选题
    The tackle that raises and lowers the boom is（）.
    A

    the cargo fall

    B

    The cargo hoisting wire rope

    C

    the topping lift

    D

    the cargo whip


    正确答案： C
    解析： 暂无解析

  • 第21题：

    单选题
    In a ordinary cargo crane, （） is fitted to rotate the crane.
    A

    the slewing motor

    B

    the lulling motor

    C

    the hoisting motor

    D

    none of the above


    正确答案： A
    解析： 暂无解析

  • 第22题：

    单选题
    With a given load on the cargo hook，tension in a single span topping lift（）.
    A

    increases as the boom's angle to the horizontal increases

    B

    is at a maximum when the boom is at a 45° angle to the horizontal

    C

    increases as the boom's angle to the horizontal decreases

    D

    decreases as the boom's angle to the horizontal decreases


    正确答案： C
    解析： 暂无解析

  • 第23题：

    单选题
    0n a crane ,the boom indicator tells the operator what angle the boom angle is compared to the（）.
    A

    vertical position

    B

    horizontal position

    C

    boom stop angle

    D

    minimum radius angle


    正确答案： D
    解析： 暂无解析

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