Page 1 of 35
NCCCO MOBILE CRANE EXAM 150 QUESTIONS AND
100% CORRECT SOLUTIONS|UPDATED VERSION
2026/2027]!!!|GUARANTEED PASS|EXAM READY
Q1. What is the main purpose of an auxiliary boom point sheave?
A. Increase crane stability
B. Allow multiple hoist lines
C. Reduce boom deflection
D. Measure load weight
Answer: B
Rationale: The auxiliary sheave allows additional hoist lines or reeving configurations to support
specialized lifting setups.
Q2. Who is responsible for calculating the net capacity of a lift?
A. Site supervisor
B. Lift director
C. Crane operator
D. Signal person
Answer: C
Rationale: The crane operator is responsible for determining net capacity by accounting for deductions
such as rigging, jib weight, and load handling devices.
Q3. What is the primary function of outrigger pads?
A. Increase boom length
B. Reduce ground pressure
C. Improve engine power
D. Stabilize hydraulic flow
Answer: B
Rationale: Outrigger pads spread the load over a larger surface area, reducing ground bearing pressure.
Q4. What should be verified before crane setup begins?
A. Fuel type
B. Ground conditions
, Page 2 of 35
C. Paint condition
D. Operator certification only
Answer: B
Rationale: Ground stability is critical to prevent tipping or settling during lifting operations.
Q5. What is the effect of lowering the boom angle during a lift?
A. Decreases radius
B. Increases radius
C. Removes load weight
D. Stops hoisting speed
Answer: B
Rationale: Lowering the boom increases the working radius, reducing lifting capacity.
Q6. Which wire rope lay is most commonly used on cranes?
A. Left lang lay
B. Right regular lay
C. Alternate twist lay
D. Cross lay
Answer: B
Rationale: Right regular lay is standard because it balances flexibility and resistance to crushing.
Q7. What is the maximum number of broken wires allowed in one lay of standard wire rope?
A. 1
B. 2
C. 3
D. 5
Answer: C
Rationale: Typically, 3 broken wires in one lay signals the rope should be removed from service.
Q8. What happens if a crane is not level?
A. Increased fuel usage
B. Reduced swing speed
C. Loss of lifting capacity
D. Increased hook height
, Page 3 of 35
Answer: C
Rationale: Uneven cranes reduce stability and significantly lower safe lifting capacity.
Q9. What is the definition of operating radius?
A. Boom tip to ground
B. Center of rotation to load center
C. Boom length only
D. Outrigger width
Answer: B
Rationale: Radius is measured from the crane’s center of rotation to the load’s center of gravity.
Q10. What is a load moment indicator (LMI) designed to do?
A. Increase engine speed
B. Prevent operator fatigue
C. Warn of overload conditions
D. Extend boom automatically
Answer: C
Rationale: LMI systems monitor load and radius to alert operators of unsafe lifting conditions.
Q11. What should be done if power lines contact the crane?
A. Exit immediately
B. Touch crane frame carefully
C. Remain in cab until de-energized
D. Jump clear instantly
Answer: C
Rationale: Staying inside reduces risk of electrocution due to ground potential differences.
Q12. What is the safest sling angle condition?
A. Low angle (15°)
B. High angle (75°)
C. 90° vertical lift
D. 0° flat sling
Answer: C
Rationale: Vertical lifts minimize sling stress and reduce load imbalance.
, Page 4 of 35
Q13. What happens as sling angle decreases?
A. Stress decreases
B. Stress increases
C. Load disappears
D. Hook strength increases
Answer: B
Rationale: Lower sling angles increase tension on slings significantly.
Q14. What is a key hazard of side loading a crane?
A. Engine overheating
B. Boom twist and instability
C. Faster lifting speed
D. Reduced fuel consumption
Answer: B
Rationale: Side loading introduces forces not intended in design, risking structural failure.
Q15. What is the most stable lifting quadrant for truck cranes?
A. Front
B. Side
C. Rear
D. Corner
Answer: C
Rationale: Rear quadrant typically provides the strongest stability base.
Q16. What does a tag line help control?
A. Boom angle
B. Load rotation
C. Engine speed
D. Outrigger pressure
Answer: B
Rationale: Tag lines prevent uncontrolled spinning of suspended loads.
Q17. What is the safest way to install wire rope on a drum?
A. From bottom of reel to bottom of drum
B. Random feed direction
NCCCO MOBILE CRANE EXAM 150 QUESTIONS AND
100% CORRECT SOLUTIONS|UPDATED VERSION
2026/2027]!!!|GUARANTEED PASS|EXAM READY
Q1. What is the main purpose of an auxiliary boom point sheave?
A. Increase crane stability
B. Allow multiple hoist lines
C. Reduce boom deflection
D. Measure load weight
Answer: B
Rationale: The auxiliary sheave allows additional hoist lines or reeving configurations to support
specialized lifting setups.
Q2. Who is responsible for calculating the net capacity of a lift?
A. Site supervisor
B. Lift director
C. Crane operator
D. Signal person
Answer: C
Rationale: The crane operator is responsible for determining net capacity by accounting for deductions
such as rigging, jib weight, and load handling devices.
Q3. What is the primary function of outrigger pads?
A. Increase boom length
B. Reduce ground pressure
C. Improve engine power
D. Stabilize hydraulic flow
Answer: B
Rationale: Outrigger pads spread the load over a larger surface area, reducing ground bearing pressure.
Q4. What should be verified before crane setup begins?
A. Fuel type
B. Ground conditions
, Page 2 of 35
C. Paint condition
D. Operator certification only
Answer: B
Rationale: Ground stability is critical to prevent tipping or settling during lifting operations.
Q5. What is the effect of lowering the boom angle during a lift?
A. Decreases radius
B. Increases radius
C. Removes load weight
D. Stops hoisting speed
Answer: B
Rationale: Lowering the boom increases the working radius, reducing lifting capacity.
Q6. Which wire rope lay is most commonly used on cranes?
A. Left lang lay
B. Right regular lay
C. Alternate twist lay
D. Cross lay
Answer: B
Rationale: Right regular lay is standard because it balances flexibility and resistance to crushing.
Q7. What is the maximum number of broken wires allowed in one lay of standard wire rope?
A. 1
B. 2
C. 3
D. 5
Answer: C
Rationale: Typically, 3 broken wires in one lay signals the rope should be removed from service.
Q8. What happens if a crane is not level?
A. Increased fuel usage
B. Reduced swing speed
C. Loss of lifting capacity
D. Increased hook height
, Page 3 of 35
Answer: C
Rationale: Uneven cranes reduce stability and significantly lower safe lifting capacity.
Q9. What is the definition of operating radius?
A. Boom tip to ground
B. Center of rotation to load center
C. Boom length only
D. Outrigger width
Answer: B
Rationale: Radius is measured from the crane’s center of rotation to the load’s center of gravity.
Q10. What is a load moment indicator (LMI) designed to do?
A. Increase engine speed
B. Prevent operator fatigue
C. Warn of overload conditions
D. Extend boom automatically
Answer: C
Rationale: LMI systems monitor load and radius to alert operators of unsafe lifting conditions.
Q11. What should be done if power lines contact the crane?
A. Exit immediately
B. Touch crane frame carefully
C. Remain in cab until de-energized
D. Jump clear instantly
Answer: C
Rationale: Staying inside reduces risk of electrocution due to ground potential differences.
Q12. What is the safest sling angle condition?
A. Low angle (15°)
B. High angle (75°)
C. 90° vertical lift
D. 0° flat sling
Answer: C
Rationale: Vertical lifts minimize sling stress and reduce load imbalance.
, Page 4 of 35
Q13. What happens as sling angle decreases?
A. Stress decreases
B. Stress increases
C. Load disappears
D. Hook strength increases
Answer: B
Rationale: Lower sling angles increase tension on slings significantly.
Q14. What is a key hazard of side loading a crane?
A. Engine overheating
B. Boom twist and instability
C. Faster lifting speed
D. Reduced fuel consumption
Answer: B
Rationale: Side loading introduces forces not intended in design, risking structural failure.
Q15. What is the most stable lifting quadrant for truck cranes?
A. Front
B. Side
C. Rear
D. Corner
Answer: C
Rationale: Rear quadrant typically provides the strongest stability base.
Q16. What does a tag line help control?
A. Boom angle
B. Load rotation
C. Engine speed
D. Outrigger pressure
Answer: B
Rationale: Tag lines prevent uncontrolled spinning of suspended loads.
Q17. What is the safest way to install wire rope on a drum?
A. From bottom of reel to bottom of drum
B. Random feed direction
