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For any given pedestal crane，when the boom is lengthened，the lifting capacity is ______．
A.unchanged
B.increased
C.eliminated
D.decreased
参考答案
更多 “ For any given pedestal crane，when the boom is lengthened，the lifting capacity is ______．A.unchangedB.increasedC.eliminatedD.decreased ” 相关考题
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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
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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
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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
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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 horizontal decreasesD.decreases as the boom's angle to the horizontal decreases
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The boom stops on a pedestal crane prevent the boom from ______.A.being raised too highB.swinging at seaC.overloading when not in useD.being lowered too low
考题
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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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
考题
What is meant by the term“luffing the boom”of a crane ________．A.Stopping the boomB.Topping or lowering the boomC.Moving the boom left or rightD.All of the above
考题
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 speedB.boom strengthC.load radiusD.cable strength
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Which of the following statement（s）is/are TRUE regarding a twin pedestal crane set ________．A.The cranes may be operated independentlyB.The cranes may be interconnected for twin operationC.When twinned，the crane rotation on the foundation assembly is unlimitedD.All of the above
考题
单选题For any given pedestal crane,when the boom is lengthened, the lifing capacity is（）.A
unchangedB
increasedC
eliminatedD
decreased
考题
单选题The boom stops on a pedestal crane prevent the boom from（）.A
being raised too highB
swinging at seaC
overloading when not in useD
being lowered too low
考题
单选题When the derrick changes its （）(角度), its lifting capacity changes correspondingly.A
angelB
lengthC
heightD
angle
考题
单选题What is meant by the term“luffing the boom”of a crane（）．A
Stopping the boomB
Topping or lowering the boomC
Moving the boom left or rightD
All of the above
考题
单选题During which condition should the operator of a pedestal crane shutdown operations?（）A
LightningB
High windsC
Fire aboardD
All of the above
考题
单选题The crane is usually mounted on a pedestal to offer adequate （） to the operator.A
timeB
spaceC
lengthD
visibility
考题
单选题Which action(s) should the operator of a pedestal crane take if crane control is lost?（）A
Let go of both control levers and return to neutral positionB
Press the emergency stopC
Notify the mate on watchD
All of the above
考题
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 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
考题
单选题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
考题
单选题For any given pedestal crane，when the boom is lengthened，the lifting capacity is（）.A
unchangedB
increasedC
eliminatedD
decreased
考题
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 speedB
boom strengthC
load radiusD
cable strength
考题
单选题Any friction fit, tightness or adhesion of the part of any load being lifted should be broken by wedge or tapping and not by increasing the load on the applianceAccording to this sentence, （）A
the lifting appliance can always lift the freight within its rated loadB
attention should be paid in order not to break the wedge when lifting cargoC
sometimes the lifting work needs other assistance other than the lifting applianceD
lifting work should be done with every part fit, tightness or adhesion
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
考题
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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