NCCCO Mobile Crane Core Exams

NCCCO Mobile Crane & Core Exams Study Bundle | Latest – Updates | Questions and Verified Answers | 100% Correct | Grade A Instructions: This study bundle for NCCCO Mobile Crane and Core Exams includes 90 multiple-choice and scenario-based questions covering load charts, rigging, crane signals, OSHA standards (e.g., 1926 Subpart CC), and safe operations. Questions reflect / updates, including emphasis on risk assessment and technology (e.g., LMI). Each question has four options (A–D), the correct answer, and a verified rationale with 100% correct solutions for Grade A preparation. Questions are worth 1 point each (total 90 points; scale to 100 for full exam). Use for study and review. Good luck!

Question 1 (Core: Site Safety)

What is the minimum clearance required between a crane and an energized power line rated 50 kV or less?

• 10 feet
• 20 feet
• 5 feet
• 15 feet

Correct Answer: A

Rationale: OSHA 1926.1408 requires 10 feet clearance for power lines ≤50 kV to prevent electrocution. Why correct: Standard safety distance for low-voltage lines. Why others are incorrect: 20 feet (B) is for 50–200 kV; 5 feet (C) is too close; 15 feet (D) is not specified.

Question 2 (Core: Crane Setup)

Who is responsible for ensuring the crane is level before operation?

• The operator
• The qualified person 1 / 4

• The rigger
• The signal person

Correct Answer: A

Rationale: The operator must ensure the crane is level, per ASME B30.5. Why correct: Operator's pre-operation duty. Why others are incorrect: Qualified person (B) inspects; rigger (C) rigs loads; signal person (D) directs.

Question 3 (Mobile: Load Charts)

When using a mobile crane load chart, what must be adjusted for side loading?

• Reduce capacity by 20%
• Increase capacity by 10%
• Use gross load only
• Ignore for short lifts

Correct Answer: A

Rationale: Side loading reduces capacity by 20% to account for stress, per ASME B30.5. Why correct: Safety derating. Why others are incorrect: Increase (B) is unsafe; gross load (C) is total weight; ignore (D) risks failure.

Question 4 (Core: Rigging)

What is the purpose of a choker hitch in rigging?

• Increase lifting capacity
• Secure the load tightly
• Reduce sling wear
• Allow load rotation

Correct Answer: B

Rationale: Choker hitch grips the load by encircling it, per OSHA 1926.251. Why correct: Tightens for stability. Why others are incorrect: Capacity (A) is reduced in choker; wear (C) is higher; rotation (D) is basket hitch.

Question 5 (Core: Signals)

What does the "stop" hand signal indicate?

• Cease all crane movements
• Lower the load 2 / 4

• Swing the boom
• Extend the boom

Correct Answer: A

Rationale: The "stop" signal (palm out) halts operations immediately, per ASME B30.5. Why correct: Emergency halt. Why others are incorrect: Lower (B), swing (C), and extend (D) are specific signals.

Question 6 (Mobile: Operations)

What is the maximum allowable boom angle deflection during a lift?

• As specified by manufacturer
• 5 degrees
• 10 degrees
• 15 degrees

Correct Answer: A

Rationale: Boom deflection limits are manufacturer-specific, per ASME B30.5. Why correct: Equipment-based safety. Why others are incorrect: 5 (B), 10 (C), and 15 (D) degrees are not universal.

Question 7 (Core: OSHA Standards)

Under OSHA 1926 Subpart CC, what is required for crane operator certification?

• Written and practical exams
• 3 years experience
• Employer training only
• Annual physical

Correct Answer: A

Rationale: OSHA requires certification through written and practical exams, per Subpart CC.Why correct: Ensures competency. Why others are incorrect: Experience (B) is prerequisite; training (C) is insufficient; physical (D) is health check.

Question 8 (Core: Site Safety)

What is the primary purpose of a pre-lift meeting?

• Review load, hazards, and procedures
• Train personnel 3 / 4

• Inspect equipment
• Calculate capacity

Correct Answer: A

Rationale: Pre-lift meetings plan the lift and identify risks, per OSHA 1926.1417. Why correct: Communication and safety. Why others are incorrect: Training (B) is separate; inspection (C) is pre-shift; capacity (D) is charts.

Question 9 (Mobile: Load Charts)

For a mobile crane, what factor reduces load capacity when lifting over the side?

• Boom configuration
• Counterweight position
• Outrigger extension
• All of the above

Correct Answer: D

Rationale: Side lifting reduces capacity due to boom (A), counterweight (B), and outrigger (C) factors, per load charts. Why correct: Comprehensive derating. Why others are incorrect: Each (A, B, C) contributes, so D is complete.

Question 10 (Core: Rigging)

What is the safe working load (SWL) for a synthetic sling?

• 80% of breaking strength
• 100% of breaking strength
• 50% of breaking strength
• 120% of breaking strength

Correct Answer: A

Rationale: Synthetic slings have an 80% SWL to account for wear, per OSHA 1926.251. Why correct: Safety factor. Why others are incorrect: 100% (B) is nominal; 50% (C) is too conservative; 120% (D) is unsafe.

Question 11 (Core: Signals)

The "dog everything" signal means:

• Stop all crane actions
• Lower the boom
• / 4