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Mobile Crane Questions Test #5 – Questions And Answers
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Mobile Crane Questions Test #5 – Questions AndAnswers
What action does a signal person intend the operator to perform if he
extends his arm at shoulder height, makes a fist with his hand, and sticks
his thumb up? Correct Ans - Boom up.
According to ASME B30.5 mobile crane standard, how many randomly
distributed broken wires, maximum, in rotation-resistant rope is cause for
replacement of the rope? Correct Ans - 2 broken wires in 6 rope
diameters.
Within what percentage of level does a telescopic boom crane have to be
for the gross ratings in the load chart to remain valid? Correct Ans -
1%.
According to the B30.5 mobile crane standard, it's OK for an operator to
leave the cab of a crane with the engine running so long as: Correct Ans
- The operator keeps the crane in view and restricts access to the area
around the crane.
If a bold line is shown on a load chart, the capacities below the line:
Correct Ans - Are based on the stability of the crane.
On duty cycle operations, such as skipping concrete, most manufacturers
require a crane's load chart capacity to be reduced by: Correct Ans -
20%.
A truck crane is set up on outriggers. The part of the load chart governed
by stability is based on what percentage of the crane's capacity?
Correct Ans - 85%.
What is the OSHA regulation governing cranes in construction? Correct
Ans - 1926.1400.
A crane is set up with 3 of its 4 outriggers fully extended and the fourth
retracted. The capacity of the crane in this configuration will be found in
the: Correct Ans - On-rubber chart or lowest applicable load chart.
, When lifting personnel, the total weight of the loaded personnel platform
must not exceed what percentage of the rated capacity of the crane?
Correct Ans - 50%.
The tipping axis of a crawler crane: Correct Ans - Depends if the
idler or sprocket are in line or offset from the track rollers.
If a jib's capacity is 5 tons, and the headache ball weighs 900 lbs, the net
capacity load would be: Correct Ans - 9,100 lbs.
What action does a signal person intend the operator to perform if he
extends his arm at shoulder height, makes a fist with his hand, and sticks
his/her thumb up? Correct Ans - Boom up.
When hoisting personnel, within what percentage of level must a telescopic
boom crane be in order for the gross ratings in the load chart to remain
valid? Correct Ans - 1%.
The load line of the crane you're operating contacts an energized power
line. There's no sign of any other danger, such as fire. What should you do?
Correct Ans - Stay in the cab until the lines are de-energized.
According to OSHA 1926.1413, how many randomly distributed broken
wires in rotation-resistant rope are cause for replacement of the rope?
Correct Ans - 2 broken wires in 6 rope diameters.
What is the net capacity of a crane on main boom unless the manufacturer
states otherwise? Correct Ans - The capacity listed in the load chart
minus the weight of the rigging and all attachments.
What may happen to a properly rigged load when lifted off the ground
unless the operator takes account of boom deflection? Correct Ans -
It could swing out away from the crane.
What Standard Method hand signal is being illustrated? (Arm raised
horizontal with hand closed in fist, a finger pointing..). Correct Ans -
Swing.
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