MOBILE CRANE EXAM PREP REALISTIC

MOBILE CRANE EXAM PREP / – REALISTIC

QUESTIONS AND 100% VERIFIED CORRECT

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• What action should a crane operator take if the load line contacts an energized

power line with no immediate danger like fire?

• Jump clear of the crane
• Stay in the cab until lines are de-energized
• Climb down slowly
• Move the crane away from the line

Correct Answer: B

Rationale: Staying in the cab prevents electrical shock until the power lines are de- energized, per OSHA 1926.1408. Moving or exiting the crane risks completing the circuit.

• What does a signal person’s arm extended at shoulder height with a fist and thumb

up indicate?

• Boom down
• Swing
• Boom up
• Extend boom

Correct Answer: C

Rationale: This is the standard hand signal for “boom up” per ASME B30.5, ensuring clear communication during crane operations.

• When lifting personnel with a telescopic boom crane, what is the maximum

allowable out-of-level percentage for load chart ratings to remain valid?

• 1%
• 2%
• 5%
• 8%

Correct Answer: A

Rationale: OSHA 1926.1431 requires telescopic boom cranes to be within 1% of level when hoisting personnel to ensure stability and safety.

• How many broken wires in six rope diameters of rotation-resistant rope require

replacement per OSHA 1926.1413?

• 1
• 2
• 3
• 4

Correct Answer: B

Rationale: OSHA specifies that two randomly distributed broken wires in six rope diameters warrant replacement to maintain rope integrity. 1 / 2

• What is the net capacity of a mobile crane unless otherwise stated by the

manufacturer?

• Load chart capacity minus rigging and all attachments
• Load chart capacity plus rigging weight
• Load chart capacity minus unused attachments
• Load chart capacity minus rigging only

Correct Answer: A

Rationale: Net capacity is calculated by subtracting the weight of rigging and all attachments from the load chart capacity to ensure safe lifting.

• What may happen to a properly rigged load if boom deflection is not accounted for

during a lift?

• Swing outward from the crane
• Swing inward toward the crane
• Lift vertically without issue
• Shift within its rigging

Correct Answer: A

Rationale: Boom deflection can cause the load to swing outward, increasing the radius and potentially exceeding capacity.

• Who should a crane operator respond to when receiving a “stop” signal?
• Appointed signal person only
• Project manager
• Superintendent
• Anyone

Correct Answer: D

Rationale: ASME B30.5 requires operators to obey a stop signal from anyone to

prioritize safety.

• In which quadrant do truck cranes without a fifth outrigger typically have no lifting

capacity?

• Side
• Rear
• Front
• Outriggers

Correct Answer: C

Rationale: Without a fifth outrigger, truck cranes lack stability over the front, limiting capacity in that quadrant.

• What is the definition of operating radius for a mobile crane?
• Distance from boom base to load center
• Distance from crane front to load center
• Distance from crane’s center of rotation to load center
• Distance from crane’s center of rotation to load’s center of gravity

Correct Answer: D

Rationale: Operating radius is measured from the crane’s center of rotation to the load’s center of gravity, critical for load chart calculations.

• What applies to capacities below the bold line on a load chart?
• Based on structural strength
• Must not be used
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