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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
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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
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Which wire rope purchases may be used with a 30-ton pedestal crane ________．A.HoistB.LuffC.Rider blockD.All of the above
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单选题During which condition should the operator of a pedestal crane shutdown operations?（）A
Lightning in the vicinityB
An approaching squall lineC
A fire on the pierD
All of the above
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单选题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
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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
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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
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单选题The crane is usually mounted on a pedestal to offer adequate （） to the operator.A
timeB
spaceC
lengthD
visibility
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单选题During which condition should the operator of a pedestal crane shutdown operations?（）A
BunkeringB
High windsC
Potable water spill on deck
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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
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单选题Most pedestal crane power is provided by（）.A
Electro-hydraulic unitsB
Steam unitsC
Independent internal combustion power unitsD
All of the above
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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0n 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
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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