AIC Tools & Equipment Operation 3

Question 1

Under OSHA 1926 Subpart CC, what is the minimum clearance a crane must keep from energized power lines rated up to 50 kV?

Accepted Answer

10 feet

Answer

OSHA Table A requires at least 10 feet of clearance for lines up to 50 kV.

Question 2

On a mobile crane load chart, what happens to rated capacity as the load radius increases?

Accepted Answer

It decreases

Answer

A longer radius increases the overturning moment, so rated capacity drops.

Question 3

A load chart rating is based on outriggers being fully extended. What should the crew do if the outriggers can only be partly extended?

Accepted Answer

Use the load chart for that specific outrigger position, if the manufacturer provides one

Answer

Capacity must come from the manufacturer's chart for the actual outrigger configuration.

Question 4

Many contractors' lift plans define a 'critical lift' as one that exceeds what percentage of the crane's rated capacity?

Accepted Answer

75%

Answer

Lifts above about 75% of rated capacity are commonly treated as critical and require a formal lift plan.

Question 5

What is the main purpose of tag lines during a crane lift?

Accepted Answer

To control rotation and swing of the load

Answer

Tag lines let workers steer and steady a suspended load while staying out from under it.

AIC - American Institute of Constructors Certification Practice Test