Crane Operator NCCCO Exam Questions & Answers 2026 (21–30)

Question 1

What is the primary purpose of checking outrigger extension marks or indicators during crane setup?

TheoryPractice · Accepted Answer

To confirm each outrigger is extended to the correct position as specified by the load chart configuration. Load chart capacities are based on specific outrigger extension positions (e.g., full, mid, retracted). Extension marks allow the operator to verify the actual configuration matches the chart being referenced, preventing accidental use of the wrong capacity column.

Question 2

What symptom may indicate that a crane's slewing ring (swing bearing) is worn or failing?

TheoryPractice · Accepted Answer

Abnormal noise or vibration during rotation and excessive play. A failing slewing ring typically produces abnormal noise (grinding, clicking), vibration during rotation, and measurable play (tilt or axial/radial movement) beyond manufacturer's tolerances. These are warning signs of bearing deterioration.

Question 3

During periodic inspection, how is slewing ring play typically measured?

TheoryPractice · Accepted Answer

Using a dial indicator to measure axial and radial deflection relative to manufacturer's tolerances. Slewing ring play is quantitatively measured using a dial indicator placed against the inner or outer race while applying a known load, then comparing the measured deflection to the manufacturer's maximum allowable play tolerance.

Question 4

What is the function of a crane's load moment indicator (LMI)?

TheoryPractice · Accepted Answer

To alert the operator when the crane is approaching its rated capacity based on load and radius. An LMI (also called a rated capacity indicator or RCI) continuously monitors the combination of load weight and working radius to warn the operator when approaching or exceeding the rated capacity. It provides an alert but does not replace the operator's judgment.

Question 5

Which safety device prevents the load block from being hoisted into the boom tip sheaves?

TheoryPractice · Accepted Answer

Anti-two-block device. The anti-two-block (ATB) device detects when the load block or headache ball is approaching the boom tip (upper block), stopping the hoist before a two-block collision that could damage the rope and drop the load.

Question 6

A crane's boom angle indicator reads 60 degrees but the actual boom angle as measured with an inclinometer is 55 degrees. What is the significance of this discrepancy?

TheoryPractice · Accepted Answer

The crane may be operating at a greater radius than the load chart rating used, creating an overload risk. A lower actual boom angle means a greater working radius than what the indicator shows. Since rated capacities decrease as radius increases, the operator may believe a lift is within capacity when it is actually overloading the crane. The device must be repaired before use.

Question 7

What type of safety device stops drum rotation when the minimum number of wraps on the drum has been reached?

TheoryPractice · Accepted Answer

Hoist limit switch (lower limit). A lower hoist limit switch (also called a dead wrap switch) stops the drum from lowering the hook further when the minimum number of wraps required to maintain rope integrity and fleet angle is reached, preventing rope from completely unwinding off the drum.

Question 8

Under OSHA 1926.1416, if a crane's load moment indicator (LMI) malfunctions, which action is permitted?

TheoryPractice · Accepted Answer

The crane may continue to operate only if a qualified person determines it is safe and the problem is corrected before the next shift. OSHA 1926.1416(d)(1) lists the LMI as required equipment. However, under (e)(4), if a listed safety device fails, the equipment must be taken out of service. A qualified person evaluates and documents the situation, and the deficiency must be corrected before the next shift begins.

Question 9

How frequently must a periodic (annual) inspection be performed on a crane in regular service?

TheoryPractice · Accepted Answer

At 12-month intervals, not to exceed 12 months. ASME B30.5 and OSHA 1926.1412 require periodic inspections at intervals not to exceed 12 months. For cranes in severe service, the frequency may be increased. The inspection must be documented.

Question 10

Periodic inspections of cranes must be performed by:

TheoryPractice · Accepted Answer

A qualified person. OSHA 1926.1412(f) requires that periodic inspections be performed by a qualified person—someone with a recognized degree, certificate, or professional standing, or who by extensive knowledge, training, and experience can solve problems related to the subject matter.

Crane Operator NCCCO Exam Questions & Answers 2026 (21–30)

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