Exam Questions And Correct Answers

Ohio Mobile Crane Operator Practice Exam Questions And Correct Answers (Verified Answers) Plus Rationales 2025|2026 Q&A | Instant Download Pdf

• What is the primary purpose of a crane load chart?
• To determine crane maintenance intervals
• To show the crane’s lift capacity under specific conditions
• To determine crane stability
• To identify operator certification

Answer: B

Rationale: Load charts list lift capacities based on boom length,

radius, and configuration.

2. The "working radius" of a crane is measured from:

• Boom tip to ground
• Center of rotation to the load’s center of gravity
• Load to nearest obstruction 1 / 3

• Boom base to truck cab

Rationale: Working radius is center of rotation to load center.

3. As load radius increases, crane lifting capacity generally:

• Increases
• Decreases
• Stays constant
• Reduces then increases

Rationale: Larger radius reduces crane stability and capacity.

• What is the most common cause of crane tip-over?
• Operating at slow speeds
• Exceeding rated load capacity
• Boom angle too steep
• Level ground conditions

Rationale: Overloading is the leading cause of tipping accidents.

5. The term "D/d ratio" relates to:

• Tire pressure
• Sheave diameter to rope diameter
• Boom length
• Hook capacity

Rationale: D/d ratio ensures wire rope does not bend excessively.

6. If a crane is not level, capacity:

• Stays the same
• Decreases significantly 2 / 3

• Increases slightly
• Is unaffected by leveling

Rationale: A crane must be level for safe rated capacity.

7. The anti-two-block device prevents:

• Boom overextension
• Hook block from contacting the boom tip
• Operator fatigue
• Hydraulic failure

Rationale: Prevents dangerous contact that can break rope.

• Which sling has the highest heat resistance?
• Nylon
• Polyester
• Wire rope
• Synthetic round sling

Rationale: Wire rope withstands higher temperatures.

9. A crane’s jib is:

• The main lifting winch
• An extension mounted to the boom tip
• The operator platform
• The load block

Rationale: A jib provides additional reach.

10. Tag lines are used to:

• Increase load capacity
• / 3