QUESTIONS WITH CORRECT ANSWERS
◉ Where is it best to connect slings to lift boom sections? Answer: End
fittings
◉ All manufacturers load charts and operations manuals shall be kept:
Answer: On the machine
◉ When shall wire rope be taken out of service if it is used as running
rope for hoisting? Answer: Six randomly distributed broken wires in one
rope lay.
OR
Three broken wires in one strand in one rope lay.
◉ What is the major reason for mobile crane accidents? Answer:
Improper crane set-up
◉ What happens to the jib capacity as the jib angle to ground increases?
Answer: Increases
, ◉ When first lifting the boom off the ground, which position should the
gantry be in? Answer: Highest
◉ When dismantling a lattice crane boom, which pins should be
removed first? Answer: Bottom
◉ The distance from the center of rotation of the crane to the center of a
freely suspended hoist line is called? Answer: Radius
◉ What is the term called when the ultimate strength of an object is
divided by the safe working load for that object? Answer: Safety factor
◉ The point about which a crane tips is called? Answer: Tipping axis
◉ What percentage of tipping is a crawler crane's stability rated at?
Answer: 75%
◉ On a lattice boom crane, what is a fixed A-frame called that is located
at the top of the superstructure which has the boom cabled attached to it?
Answer: Gantry