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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 horizonta

题目

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

相似考题

1.Stress on the topping lift of a swinging boom can be reduced by ______.A.rigging a back stayB.raising the boomC.increasing the mechanical advantage of the cargo purchaseD.taking all slack out of the preventer

2.Which part of a conventional cargo gear rig provides for vertical control and positioning of a boom ________．A.Cargo whipB.Gooseneck fittingC.Spider bandD.Topping lift

3.If an electric cargo winch is being used to lift a draft of cargo and the engine room loses all power，which will occur ________．A.A pawl，forced by a spring mechanism，will engage the teeth of the bull gear and hold the loadB.An electromagnetic brake will hold the load where it is suspendedC.The load will fall rapidly to the deck unless the foot brake is engagedD.The load will slowly lower to the deck under control of the drag of the winch motor

4.With a given load on the cargo hook，the thrust on a cargo boom ______.A.increases as the angle to the horizontal increasesB.increases as the angle to the horizontal decreasesC.is greatest at an angle of 45° and decreases as the boom is raised or loweredD.is least at an angle of 45° and increases as the boom is raised or lowered

更多“With a given load on the cargo hook,tension in a single span topping lift ______.A.increas ”相关问题

  • 第1题：

    Mousing a cargo hook with marline or small line ______.

    A.increases the lifting capacity of the hook

    B.protects the hook from the sling ring

    C.prevents the sling ring from coming out of the hook

    D.All of the above


    正确答案：C
    吊货钩上的缠扎钩口是防止吊货环脱落吊钩。

  • 第2题：

    吊货索（）

    • A、cargo fall
    • B、cargo runner
    • C、cargo light
    • D、cargo hook

    正确答案:A

  • 第3题：

    The （）(双杆联吊) is that two booms are used with a single hook.

    • A、derrick
    • B、union purchase
    • C、topping lift block
    • D、crane

    正确答案:B

  • 第4题：

    The （）(千斤滑车) can run the gooseneck.

    • A、heavy derrick
    • B、pulley block
    • C、topping lift block
    • D、guy tackle

    正确答案:C

  • 第5题：

    货钩（）

    • A、cargo chain
    • B、cargo tray
    • C、cargo hook
    • D、can hook

    正确答案:C

  • 第6题：

    单选题
    The （）(重吊杆) can lift heavy cargo.
    A

    heavy cargo derrick

    B

    heavy deck

    C

    jumbo boom

    D

    heavy block


    正确答案： C
    解析： 暂无解析

  • 第7题：

    单选题
    Stress on the topping lift of a swinging boom can be reduced by（）.
    A

    rigging a back stay

    B

    raising the boom

    C

    increasing the mechanical advantage of the cargo purchase

    D

    taking all slack out of the preventer


    正确答案： B
    解析： 暂无解析

  • 第8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9题：

    单选题
    The （）(双杆联吊) is that two booms are used with a single hook.
    A

    derrick

    B

    union purchase

    C

    topping lift block

    D

    crane


    正确答案： D
    解析： 暂无解析

  • 第10题：

    单选题
    Mousing a cargo hook with marline or small line（）.
    A

    increases the lifting capacity of the hook

    B

    protects the hook from the sling ring

    C

    prevents the sling ring from coming out of the hook

    D

    All of the above


    正确答案： A
    解析： 暂无解析

  • 第11题：

    单选题
    A bench hook is used for（）.
    A

    handing of cargo cases

    B

    handing oilskings

    C

    sewing canvas

    D

    splicing small stuff


    正确答案： A
    解析： 暂无解析

  • 第12题：

    单选题
    A single heavy wire made up for the topping lift is called a（）.
    A

    bale

    B

    spanner wire

    C

    bull line

    D

    working guy


    正确答案： D
    解析： 暂无解析

  • 第13题：

    topping lift（）

    • A、千斤索
    • B、定位滑车
    • C、稳索
    • D、千斤顶

    正确答案:A

  • 第14题：

    The jumbo boom can （）.

    • A、lift heavy cargo
    • B、load and unload
    • C、join ropes together
    • D、lift light cargo

    正确答案:A

  • 第15题：

    大副告诉装卸工人不要用钩子装袋装货。（）

    • A、The chief officer told the stevedores not to use hooks to load the deck cargo.
    • B、The bosun told the stevedores not to use hooks to load the bagged cargo.
    • C、The chief officer told the stevedores not to use hooks to load the bagged cargo.
    • D、The bosun told the stevedores not to use hooks to load the deck cargo.

    正确答案:C

  • 第16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17题：

    单选题
    A flounder plate，on a topping lift，is（）.
    A

    a fairlead block

    B

    a swivel pin for the topping lift block

    C

    a triangular steel plate with a hole at each corner

    D

    the lower block of a multiple part topping lift


    正确答案： A
    解析： 暂无解析

  • 第18题：

    单选题
    You are approaching a vertical lift bridge.You know the span is fully open when（）.
    A

    Three white lights in a vertical line are lit

    B

    A red light starts to flash at about 60 times a minute

    C

    A yellow light is illuminated on the bridge pier

    D

    There is a range of green lights under the lift span


    正确答案： D
    解析： 暂无解析

  • 第19题：

    单选题
    The force acting on a single cargo runner which is vertically lifting or lowering a load is greatest when（）.
    A

    decelerating when lowering the load

    B

    decelerating when raising the load

    C

    lowering the load at constant speed

    D

    raising the load at constant speed


    正确答案： D
    解析： 暂无解析

  • 第20题：

    单选题
    topping lift（）
    A

    千斤索

    B

    定位滑车

    C

    稳索

    D

    千斤顶


    正确答案： B
    解析： 暂无解析

  • 第21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
    In a general cargo crane, （） is fitted to lift the cargo load.
    A

    the slewing motor

    B

    the luffing motor

    C

    the hoisting motor

    D

    none of the above


    正确答案： D
    解析： 暂无解析

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