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1. What is the primary purpose of a crane load chart?
A. To determine fuel consumption
B. To identify maximum safe lifting capacity under specific
conditions
C. To calculate operator wages
D. To schedule maintenance intervals
Answer: B
Rationale: Load charts provide the crane’s rated capacities based
on boom length, radius, configuration, and conditions, ensuring
safe lifting limits are not exceeded.
2. What factor most directly reduces a crane’s lifting capacity?
A. Decreased wind speed
B. Increased load radius
C. Shorter boom length
D. Smaller hook block
Answer: B
Rationale: As the load radius increases, leverage decreases,
significantly reducing lifting capacity.
3. What is the first action when a crane contacts a power line?
A. Exit the crane immediately
B. Move the crane away from the line
, C. Stay in the cab and call for help
D. Jump clear of the crane
Answer: C
Rationale: Staying inside prevents electrical grounding through
the body; exiting is only safe if fire requires evacuation by
jumping clear.
4. What is the minimum required distance from energized power
lines (under 50 kV) according to OSHA guidelines?
A. 3 feet
B. 5 feet
C. 10 feet
D. 20 feet
Answer: C
Rationale: OSHA generally requires a minimum clearance of 10
feet for lines under 50 kV.
5. What device prevents overloading a crane?
A. Load moment indicator (LMI)
B. Tachometer
C. Fuel gauge
D. Wind meter
Answer: A
Rationale: The LMI monitors load weight and radius to prevent
exceeding safe operating limits.
6. What is the most important factor in crane stability?
A. Paint condition
B. Load chart accuracy
C. Ground bearing pressure
D. Operator height
Answer: C
, Rationale: Stable ground ensures the crane does not tip or settle
under load.
7. What should be checked before every lift?
A. Tire pressure only
B. Load weight and rigging
C. Operator schedule
D. Weather forecast only
Answer: B
Rationale: Knowing load weight and proper rigging ensures safe
lifting operations.
8. What is a swing radius hazard?
A. Crane tire movement
B. Area where crane rotates
C. Boom extension zone only
D. Cab door swing area
Answer: B
Rationale: The swing radius is the area around a rotating crane
where serious crushing hazards exist.
9. What is the purpose of outriggers?
A. Increase engine speed
B. Stabilize and level the crane
C. Reduce fuel use
D. Improve radio signals
Answer: B
Rationale: Outriggers increase the crane’s footprint and stability
during lifts.
10. Who is responsible for determining ground conditions for
crane setup?
A. Operator only