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单选题
0n a crane ,the boom indicator tells the operator what angle the boom angle is compared to the（）.
A
vertical position
B
horizontal position
C
boom stop angle
D
minimum radius angle
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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 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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单选题The actual rudder angle reading is（）A
the rudder angle indicator readingB
the desired rudder angle readingC
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the intended rudder angle reading
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单选题How should you signal the crane operator to raise the boom?（）.A
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单选题For any given pedestal crane,when the boom is lengthened, the lifing capacity is（）.A
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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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swinging at seaC
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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
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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
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With arm extended downwards and forefinger pointing down，move hand in small horizontal circles
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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
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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 requiredB
minimum horsepower requiredC
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allowable load
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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
Place both fists in front of the body with the thumbs pointing outward each otherC
Clasp hands in front of you bodyD
Extend arm with the thumb pointing up, and flex the finger s in and out for as long as the load movement is desired
考题
单选题The boom indicator tells the operator at what angle the boom is compared to the（）.A
horizontal position of the boomB
vertical position of the boomC
horizontal position of the load being liftedD
vertical position of the load being lifted
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单选题The load chart of a ship crane enables the operator to combine the load radius with boom length to determine the（）.A
maximum counter weight requiredB
minimum horsepower requiredC
hoist rope strengthD
allowable load
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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
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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
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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
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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