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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 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
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更多 “ 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 ” 相关考题
考题
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
考题
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
考题
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
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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
考题
Mousing a cargo hook with marline or small line ______.A.increases the lifting capacity of the hookB.protects the hook from the sling ringC.prevents the sling ring from coming out of the hookD.All of the above
考题
The jumbo boom can （）.A、lift heavy cargoB、load and unloadC、join ropes togetherD、lift light cargo
考题
The （）(双杆联吊) is that two booms are used with a single hook.A、derrickB、union purchaseC、topping lift blockD、crane
考题
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.
考题
The （）(千斤滑车) can run the gooseneck.A、heavy derrickB、pulley blockC、topping lift blockD、guy tackle
考题
单选题A flounder plate，on a topping lift，is（）.A
a fairlead blockB
a swivel pin for the topping lift blockC
a triangular steel plate with a hole at each cornerD
the lower block of a multiple part topping lift
考题
单选题The （）(重吊杆) can lift heavy cargo.A
heavy cargo derrickB
heavy deckC
jumbo boomD
heavy block
考题
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 litB
A red light starts to flash at about 60 times a minuteC
A yellow light is illuminated on the bridge pierD
There is a range of green lights under the lift span
考题
单选题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
考题
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 loadB
decelerating when raising the loadC
lowering the load at constant speedD
raising the load at constant speed
考题
单选题The tackle that raises and lowers the boom is（）.A
the cargo fallB
The cargo hoisting wire ropeC
the topping liftD
the cargo whip
考题
单选题The （）(双杆联吊) is that two booms are used with a single hook.A
derrickB
union purchaseC
topping lift blockD
crane
考题
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 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
考题
单选题Mousing a cargo hook with marline or small line（）.A
increases the lifting capacity of the hookB
protects the hook from the sling ringC
prevents the sling ring from coming out of the hookD
All of the above
考题
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 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
考题
单选题A bench hook is used for（）.A
handing of cargo casesB
handing oilskingsC
sewing canvasD
splicing small stuff
考题
单选题In a general cargo crane, （） is fitted to lift the cargo load.A
the slewing motorB
the luffing motorC
the hoisting motorD
none of the above
考题
单选题A single heavy wire made up for the topping lift is called a（）.A
baleB
spanner wireC
bull lineD
working guy
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