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单选题
The load chart of a crane enables the operator to combine the load radius with boom length to determine the（）.
A
maximum counter weight required
B
minimum horsepower required
C
hoist rope strength
D
allowable load
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How should you signal the crane operator to lower the boom and raise the load ________．A.Extend arm and point finger in the direction to move the boomB.Extend arm with thumb pointing downward and flex fingers in and outC.With forearm vertical and forefinger pointing up，move hand in small horizontal circlesD.With arm extended downwards and forefinger pointing down，move hand in small horizontal circles
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单选题During which condition should the operator of a pedestal crane shutdown operations?（）A
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单选题Which of the following statements is TRUE regarding crane operations（）.A
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timeB
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单选题How should you signal the crane operator to move slowly（）.A
Use one hand to give any motion signal，and place the other hand motionless in front of the hand giving the motion signaB
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First tap the top of your head with your fist and then proceed to use regular signals
考题
单选题How should you signal the crane operator to lower the boom and raise the load（）.A
Extend arm and point finger in the direction to move the boomB
Extend arm with thumb pointing downward and flex fingers in and outC
With forearm vertical and forefinger pointing up，move hand in small horizontal circlesD
With arm extended downwards and forefinger pointing down，move hand in small horizontal circles
考题
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HASB
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单选题How should you signal the crane operator to raise the boom and lower the load?（）.A
Extend arm with the palm down and and hold this position rigidlyB
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Extend arm with the thumb pointing up, and flex the finger s in and out for as long as the load movement is desired
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maximum counter weight requiredB
minimum horsepower requiredC
hoist rope strengthD
allowable load
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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
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All of the above
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boom angleB
boom strengthC
load radiusD
cable strength
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