NCCCO ACTUAL EXAM 2 QUESTIONS
AND ANSWERS. VERIFIED
1. When operating a mobile crane, what is the effect of having the outriggers extended but
the tires are still touching the ground?
A. The crane is considered ‘on outriggers’ for load chart purposes.
B. The load chart capacities are increased due to the extra support.
C. The crane is more stable than if the tires were off the ground.
D. The crane is considered ‘on rubber’ and capacities are significantly reduced.
Answer: D
Conceptual Explanation: For a crane to be considered ‘on outriggers,’ the tires must be
completely clear of the ground and the weight of the crane supported by the outrigger
pads.
2. According to OSHA 1926.1408, what is the minimum clearance for power lines rated up to
50 kV when the voltage is unknown?
A. 45 feet
B. 15 feet
C. 20 feet
,D. 10 feet
Answer: D
Conceptual Explanation: OSHA requires a minimum clearance of 10 feet for power lines
up to 50 kV unless the specific voltage is determined to require more.
3. What occurs when a load is suddenly released, causing the boom to whip backward?
A. Dynamic loading
B. Tipping moment increase
C. Structural compression
D. Backward stability failure
Answer: D
Conceptual Explanation: The sudden release of a load can cause the boom to recoil past
the vertical plane, potentially causing backward stability failure or structural damage.
4. How many randomly distributed broken wires in one rope lay are required to remove a
running wire rope from service under ASME B30.5?
A. 3
B. 12
C. 6
D. 9
, Answer: C
Conceptual Explanation: ASME B30.5 standards state that for running ropes, 6 randomly
distributed broken wires in one rope lay is cause for removal.
5. If a crane’s load chart indicates a capacity of 50,000 lbs at a 30-foot radius, and the block
weighs 1,200 lbs and rigging weighs 300 lbs, what is the net capacity?
A. 51,500 lbs
B. 50,000 lbs
C. 48,500 lbs
D. 49,700 lbs
Answer: C
Conceptual Explanation: Net capacity = Gross Capacity - Deductions (Block + Rigging).
50,000 - 1,500 = 48,500 lbs.
6. When lifting from the main boom with a jib stowed on the boom base, how should the jib
weight be treated?
A. It is neglected.
B. It is added to the net capacity.
C. It is only deducted if the jib is deployed.
D. It is treated as a deduction based on the manufacturer’s specific effective weight.
Answer: D
AND ANSWERS. VERIFIED
1. When operating a mobile crane, what is the effect of having the outriggers extended but
the tires are still touching the ground?
A. The crane is considered ‘on outriggers’ for load chart purposes.
B. The load chart capacities are increased due to the extra support.
C. The crane is more stable than if the tires were off the ground.
D. The crane is considered ‘on rubber’ and capacities are significantly reduced.
Answer: D
Conceptual Explanation: For a crane to be considered ‘on outriggers,’ the tires must be
completely clear of the ground and the weight of the crane supported by the outrigger
pads.
2. According to OSHA 1926.1408, what is the minimum clearance for power lines rated up to
50 kV when the voltage is unknown?
A. 45 feet
B. 15 feet
C. 20 feet
,D. 10 feet
Answer: D
Conceptual Explanation: OSHA requires a minimum clearance of 10 feet for power lines
up to 50 kV unless the specific voltage is determined to require more.
3. What occurs when a load is suddenly released, causing the boom to whip backward?
A. Dynamic loading
B. Tipping moment increase
C. Structural compression
D. Backward stability failure
Answer: D
Conceptual Explanation: The sudden release of a load can cause the boom to recoil past
the vertical plane, potentially causing backward stability failure or structural damage.
4. How many randomly distributed broken wires in one rope lay are required to remove a
running wire rope from service under ASME B30.5?
A. 3
B. 12
C. 6
D. 9
, Answer: C
Conceptual Explanation: ASME B30.5 standards state that for running ropes, 6 randomly
distributed broken wires in one rope lay is cause for removal.
5. If a crane’s load chart indicates a capacity of 50,000 lbs at a 30-foot radius, and the block
weighs 1,200 lbs and rigging weighs 300 lbs, what is the net capacity?
A. 51,500 lbs
B. 50,000 lbs
C. 48,500 lbs
D. 49,700 lbs
Answer: C
Conceptual Explanation: Net capacity = Gross Capacity - Deductions (Block + Rigging).
50,000 - 1,500 = 48,500 lbs.
6. When lifting from the main boom with a jib stowed on the boom base, how should the jib
weight be treated?
A. It is neglected.
B. It is added to the net capacity.
C. It is only deducted if the jib is deployed.
D. It is treated as a deduction based on the manufacturer’s specific effective weight.
Answer: D
