NCCCO Tower Crane Operator
Certification Exam (Latest Update 2025 /
2026) Questions with Answers | Grade A |
100% Correct
Question 1 What is the maximum allowable sustained wind speed for tower crane operations
according to the latest NCCCO & ASME B30.5 standards? A. 20 mph B. 30 mph C. 40 mph D.
50 mph
Answer: B. 30 mph Rationale: ASME B30.5 (2024/2025 edition) and NCCCO require
operations to cease when sustained winds exceed 30 mph (or gusts exceed 40 mph), unless the
manufacturer specifies a lower limit.
Question 2 The primary purpose of the slew brake on a tower crane is to: A. Prevent luffing of
the jib B. Stop and hold the upper rotating structure C. Control hoist motor speed D. Lock the
trolley position
Answer: B. Stop and hold the upper rotating structure Rationale: The slew brake controls
and holds the rotation of the upper works (jib, counter-jib, cab, and load).
Question 3 Load radius on a tower crane is measured from: A. The center of rotation to the hook
B. The mast centerline to the hook C. The jib pivot point to the hook D. The counterweight to the
hook
Answer: A. The center of rotation to the hook Rationale: Load radius is the horizontal
distance from the center of rotation (slewing axis) to the vertical line through the load.
Question 4 If the wire rope shows 6 or more random broken wires in one lay, the required action
is: A. Continue operation B. Remove from service and replace the rope C. Reduce capacity by
50% D. Increase inspection frequency
, Answer: B. Remove from service and replace the rope Rationale: ASME B30.5 requires
immediate removal from service for 6 or more random broken wires in one lay (or 3 in one
strand).
Question 5 When the crane is used in a configuration not listed in the manual, the operator must:
A. Consult the manufacturer or qualified engineer B. Reduce load by 50% C. Continue if the
load is light D. Increase counterweight
Answer: A. Consult the manufacturer or qualified engineer Rationale: Any non-standard
configuration requires manufacturer approval or engineering analysis.
Question 6 The load moment indicator (LMI) on a tower crane primarily prevents: A.
Overloading the crane B. Excessive slew speed C. Trolley runaway D. Hook block striking the
boom tip
Answer: A. Overloading the crane Rationale: The LMI continuously monitors load weight
and radius and provides warnings when approaching or exceeding rated capacity.
Question 7 According to OSHA 1926.1427, who is ultimately responsible for ensuring the tower
crane operator is qualified/certified? A. The operator B. The signal person C. The employer D.
The rigger
Answer: C. The employer Rationale: The employer must verify operator qualification through
NCCCO certification or equivalent documented evaluation.
Question 8 Functional testing of all limit switches (hoist, trolley, luffing) must be performed: A.
Only during annual inspection B. Before each shift C. Only when lifting a new load D. Every 30
days
Answer: B. Before each shift Rationale: ASME B30.5 and NCCCO require pre-operational
functional testing of limit switches before each shift.
Question 9 The minimum clearance required between the crane and any power line rated up to
50 kV is: A. 6 feet B. 10 feet C. 15 feet D. 20 feet
Certification Exam (Latest Update 2025 /
2026) Questions with Answers | Grade A |
100% Correct
Question 1 What is the maximum allowable sustained wind speed for tower crane operations
according to the latest NCCCO & ASME B30.5 standards? A. 20 mph B. 30 mph C. 40 mph D.
50 mph
Answer: B. 30 mph Rationale: ASME B30.5 (2024/2025 edition) and NCCCO require
operations to cease when sustained winds exceed 30 mph (or gusts exceed 40 mph), unless the
manufacturer specifies a lower limit.
Question 2 The primary purpose of the slew brake on a tower crane is to: A. Prevent luffing of
the jib B. Stop and hold the upper rotating structure C. Control hoist motor speed D. Lock the
trolley position
Answer: B. Stop and hold the upper rotating structure Rationale: The slew brake controls
and holds the rotation of the upper works (jib, counter-jib, cab, and load).
Question 3 Load radius on a tower crane is measured from: A. The center of rotation to the hook
B. The mast centerline to the hook C. The jib pivot point to the hook D. The counterweight to the
hook
Answer: A. The center of rotation to the hook Rationale: Load radius is the horizontal
distance from the center of rotation (slewing axis) to the vertical line through the load.
Question 4 If the wire rope shows 6 or more random broken wires in one lay, the required action
is: A. Continue operation B. Remove from service and replace the rope C. Reduce capacity by
50% D. Increase inspection frequency
, Answer: B. Remove from service and replace the rope Rationale: ASME B30.5 requires
immediate removal from service for 6 or more random broken wires in one lay (or 3 in one
strand).
Question 5 When the crane is used in a configuration not listed in the manual, the operator must:
A. Consult the manufacturer or qualified engineer B. Reduce load by 50% C. Continue if the
load is light D. Increase counterweight
Answer: A. Consult the manufacturer or qualified engineer Rationale: Any non-standard
configuration requires manufacturer approval or engineering analysis.
Question 6 The load moment indicator (LMI) on a tower crane primarily prevents: A.
Overloading the crane B. Excessive slew speed C. Trolley runaway D. Hook block striking the
boom tip
Answer: A. Overloading the crane Rationale: The LMI continuously monitors load weight
and radius and provides warnings when approaching or exceeding rated capacity.
Question 7 According to OSHA 1926.1427, who is ultimately responsible for ensuring the tower
crane operator is qualified/certified? A. The operator B. The signal person C. The employer D.
The rigger
Answer: C. The employer Rationale: The employer must verify operator qualification through
NCCCO certification or equivalent documented evaluation.
Question 8 Functional testing of all limit switches (hoist, trolley, luffing) must be performed: A.
Only during annual inspection B. Before each shift C. Only when lifting a new load D. Every 30
days
Answer: B. Before each shift Rationale: ASME B30.5 and NCCCO require pre-operational
functional testing of limit switches before each shift.
Question 9 The minimum clearance required between the crane and any power line rated up to
50 kV is: A. 6 feet B. 10 feet C. 15 feet D. 20 feet
