NCCCO PROFESSIONAL CRANE
OPERATOR CERTIFICATION MOCK
EXAM
1. When calculating the net capacity of a crane, which of the following is considered a
deduction from the gross capacity?
A. The weight of the load being lifted
B. The weight of the headache ball and rigging hardware
C. The weight of the hoist rope above the boom tip
D. The wind speed correction factor
Answer: B
Conceptual Explanation: Net capacity is calculated by subtracting all ‘deductions’ (block,
ball, rigging, stowed jibs) from the gross capacity found in the load chart.
2. According to OSHA 1926.1408, what is the minimum clearance distance for power lines
rated at 350kV to 500kV?
A. 25 feet
B. 20 feet
,C. 10 feet
D. 50 feet
Answer: A
Conceptual Explanation: For power lines between 350kV and 500kV, the minimum
clearance distance is 25 feet.
3. What is the primary reason for boom deflection during a heavy lift?
A. Compression and elasticity of the boom material under load
B. Structural failure of the boom lacings
C. Improper outrigger extension
D. High wind speeds hitting the boom
Answer: A
Conceptual Explanation: Boom deflection is the bending of the boom under load due to
the elasticity of steel, which increases the load radius.
4. If a crane is not level within 1 degree, how does this affect the load chart capacity?
A. The load chart remains valid as long as outriggers are fully extended
B. Capacities are reduced because of side-loading on the boom
C. The crane will automatically shut down via the LMI
D. The operator should switch to the ‘on-rubber’ chart
, Answer: B
Conceptual Explanation: Operating a crane that is not level causes side-loading, which
significantly reduces structural integrity and can lead to tipping.
5. In a personnel platform lift, the total weight of the loaded platform must not exceed what
percentage of the crane’s rated capacity?
A. 25%
B. 100%
C. 75%
D. 50%
Answer: D
Conceptual Explanation: OSHA requires that the total weight of the loaded personnel
platform not exceed 50% of the rated capacity for the radius and configuration.
6. What is the ‘D/d ratio’ primarily used to determine in rigging?
A. The distance between the crane and the load
B. The ratio of the drum diameter to the wire rope diameter to prevent fatigue
C. The depth of the sheave groove
D. The density of the load material
Answer: B
OPERATOR CERTIFICATION MOCK
EXAM
1. When calculating the net capacity of a crane, which of the following is considered a
deduction from the gross capacity?
A. The weight of the load being lifted
B. The weight of the headache ball and rigging hardware
C. The weight of the hoist rope above the boom tip
D. The wind speed correction factor
Answer: B
Conceptual Explanation: Net capacity is calculated by subtracting all ‘deductions’ (block,
ball, rigging, stowed jibs) from the gross capacity found in the load chart.
2. According to OSHA 1926.1408, what is the minimum clearance distance for power lines
rated at 350kV to 500kV?
A. 25 feet
B. 20 feet
,C. 10 feet
D. 50 feet
Answer: A
Conceptual Explanation: For power lines between 350kV and 500kV, the minimum
clearance distance is 25 feet.
3. What is the primary reason for boom deflection during a heavy lift?
A. Compression and elasticity of the boom material under load
B. Structural failure of the boom lacings
C. Improper outrigger extension
D. High wind speeds hitting the boom
Answer: A
Conceptual Explanation: Boom deflection is the bending of the boom under load due to
the elasticity of steel, which increases the load radius.
4. If a crane is not level within 1 degree, how does this affect the load chart capacity?
A. The load chart remains valid as long as outriggers are fully extended
B. Capacities are reduced because of side-loading on the boom
C. The crane will automatically shut down via the LMI
D. The operator should switch to the ‘on-rubber’ chart
, Answer: B
Conceptual Explanation: Operating a crane that is not level causes side-loading, which
significantly reduces structural integrity and can lead to tipping.
5. In a personnel platform lift, the total weight of the loaded platform must not exceed what
percentage of the crane’s rated capacity?
A. 25%
B. 100%
C. 75%
D. 50%
Answer: D
Conceptual Explanation: OSHA requires that the total weight of the loaded personnel
platform not exceed 50% of the rated capacity for the radius and configuration.
6. What is the ‘D/d ratio’ primarily used to determine in rigging?
A. The distance between the crane and the load
B. The ratio of the drum diameter to the wire rope diameter to prevent fatigue
C. The depth of the sheave groove
D. The density of the load material
Answer: B
