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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
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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
考题
单选题The （）(笨重货) must be handled by jumbo boom or shore crane.A
awkward cargoB
drummed cargoC
cased cargoD
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考题
单选题For any given pedestal crane,when the boom is lengthened, the lifing capacity is（）.A
unchangedB
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考题
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
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raise the hookC
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单选题The boom stops on a pedestal crane prevent the boom from（）.A
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单选题What is meant by the term“luffing the boom”of a crane（）．A
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Topping or lowering the boomC
Moving the boom left or rightD
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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 slingsB
During any cargo handling operation，the safety of personnel is paramountC
Cargo handlers must be outfitted with adequate protection from personal injuryD
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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
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winch speedB
boom strengthC
load radiusD
cable strength
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单选题For a given weight of cargo，the stress on the heel block of a cargo boom（）.A
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is determined by the thrust stresses on the boom
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单选题In a ordinary cargo crane, （） is fitted to rotate the crane.A
the slewing motorB
the lulling motorC
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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What does “evel-luffing” accomplish during crane operations（）.A
It prevents the load from swinging when the boom level is adjustedB
Less power is needed when topping the boom with a load on the hookC
It maintains the height of the load above the deckD
All of the above
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vertical positionB
horizontal positionC
boom stop angleD
minimum radius angle
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单选题The boom indicator on a crane will indicate the（）.A
length of the boomB
angle of the boomC
lifting capacity of the boomD
direction of the boom
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