NCCCO CORE PRACTICE EXAM
120 Multiple-Choice Questions with Answers & Rationales
1. What is the primary purpose of a signal person on a crane job site?
A. To operate the crane's controls in an emergency
B. To communicate crane and load movement instructions to the operator when
the operator's view is obstructed or restricted
C. To perform the daily maintenance inspection of the crane
D. To calculate the crane's rated capacity for each lift
Correct Answer: B
Rationale: A signal person's job is to relay clear directions to the operator whenever
the operator cannot see the load, the path of travel, or the point of operation
directly.
2. Which of the following is the correct hand signal for 'Stop'?
A. Arm extended, palm down, moved back and forth horizontally
B. Arm extended horizontally to the side, palm down, then moved up and down
C. Both arms extended, palms down
D. Fist held up in front of the body
Correct Answer: A
Rationale: The standard 'Stop' signal is one arm extended, palm down, moved back
and forth horizontally, telling the operator to halt all motion.
3. Before beginning any lift, who is ultimately responsible for the safety of the
lift?
A. The signal person
B. The rigger
C. The crane operator
D. The site supervisor
Correct Answer: C
Rationale: While many people share responsibilities on a lift, the operator has final
authority and responsibility for the safe operation of the crane during the lift.
,4. A crane's load chart rating is based on which of the following
configurations?
A. The crane on rubber with the boom fully retracted only
B. A specific, defined configuration including boom length, radius, and setup
(outriggers/counterweight)
C. The average of all possible configurations
D. The manufacturer's maximum theoretical tipping capacity
Correct Answer: B
Rationale: Load charts are configuration-specific; capacity changes with boom
length, radius, counterweight, and outrigger position, so the exact configuration
must match the chart being read.
5. What does 'working radius' refer to on a mobile crane?
A. The horizontal distance from the centerline of rotation to the center of the hook
or load
B. The total length of the boom from base to tip
C. The distance the crane can travel while carrying a load
D. The vertical height from the ground to the boom tip
Correct Answer: A
Rationale: Working radius is measured horizontally from the crane's axis of rotation
to the vertical line through the load, and it directly affects the crane's rated capacity.
6. As the radius of a crane's load increases (boom lowered further from
vertical), what generally happens to the rated capacity?
A. It increases
B. It decreases
C. It stays the same
D. It becomes unlimited
Correct Answer: B
Rationale: As radius increases, the overturning moment on the crane increases, so
the rated capacity the crane can safely lift decreases.
,7. What is the purpose of outriggers on a mobile crane?
A. To increase the boom's maximum length
B. To widen the crane's effective base and provide stability during lifting
C. To reduce the weight of the counterweight needed
D. To allow the crane to travel at higher speeds
Correct Answer: B
Rationale: Outriggers extend and set down to widen the crane's support base,
which increases stability and allows for higher rated capacities than lifting on
rubber.
8. What should be done before extending a crane's outriggers?
A. Nothing special is required
B. Verify the ground conditions can support the imposed loads and use
cribbing/mats as needed
C. Only extend them after the boom is fully raised
D. Remove all counterweight first
Correct Answer: B
Rationale: Ground bearing capacity must be verified and adequate cribbing or
outrigger pads used, since inadequate ground support can cause outrigger float
and tip-over.
9. What is 'boom deflection'?
A. The bending or flexing of the boom under load
B. The rotation of the crane's superstructure
C. The extension of telescoping boom sections
D. The angle between the boom and the load line
Correct Answer: A
Rationale: Boom deflection is the natural bending of the boom that occurs as load is
applied; excessive or unexpected deflection can signal an overload condition.
, 10. A two-block condition occurs when:
A. The load block contacts the boom tip (or auxiliary sheave) causing possible
failure
B. Two cranes lift the same load together
C. The boom is telescoped to two sections
D. Two outriggers are set on the same mat
Correct Answer: A
Rationale: Two-blocking happens when the hook block runs up into the boom tip
sheaves; this can part the wire rope or damage the boom and is a serious hazard.
11. What device is designed to prevent a two-block condition?
A. Load moment indicator
B. Anti-two-block device
C. Boom angle indicator
D. Outrigger pressure gauge
Correct Answer: B
Rationale: An anti-two-block device automatically stops hoisting or telescoping
motion (or warns the operator) before the block contacts the boom tip.
12. What is a Load Moment Indicator (LMI) used for?
A. Measuring wind speed at the boom tip
B. Providing the operator with real-time information on load, radius, and
percentage of rated capacity
C. Automatically rigging the load
D. Calculating the ground bearing pressure
Correct Answer: B
Rationale: An LMI system continuously computes and displays the load, radius, and
percent of capacity being used, helping the operator avoid overloads.
120 Multiple-Choice Questions with Answers & Rationales
1. What is the primary purpose of a signal person on a crane job site?
A. To operate the crane's controls in an emergency
B. To communicate crane and load movement instructions to the operator when
the operator's view is obstructed or restricted
C. To perform the daily maintenance inspection of the crane
D. To calculate the crane's rated capacity for each lift
Correct Answer: B
Rationale: A signal person's job is to relay clear directions to the operator whenever
the operator cannot see the load, the path of travel, or the point of operation
directly.
2. Which of the following is the correct hand signal for 'Stop'?
A. Arm extended, palm down, moved back and forth horizontally
B. Arm extended horizontally to the side, palm down, then moved up and down
C. Both arms extended, palms down
D. Fist held up in front of the body
Correct Answer: A
Rationale: The standard 'Stop' signal is one arm extended, palm down, moved back
and forth horizontally, telling the operator to halt all motion.
3. Before beginning any lift, who is ultimately responsible for the safety of the
lift?
A. The signal person
B. The rigger
C. The crane operator
D. The site supervisor
Correct Answer: C
Rationale: While many people share responsibilities on a lift, the operator has final
authority and responsibility for the safe operation of the crane during the lift.
,4. A crane's load chart rating is based on which of the following
configurations?
A. The crane on rubber with the boom fully retracted only
B. A specific, defined configuration including boom length, radius, and setup
(outriggers/counterweight)
C. The average of all possible configurations
D. The manufacturer's maximum theoretical tipping capacity
Correct Answer: B
Rationale: Load charts are configuration-specific; capacity changes with boom
length, radius, counterweight, and outrigger position, so the exact configuration
must match the chart being read.
5. What does 'working radius' refer to on a mobile crane?
A. The horizontal distance from the centerline of rotation to the center of the hook
or load
B. The total length of the boom from base to tip
C. The distance the crane can travel while carrying a load
D. The vertical height from the ground to the boom tip
Correct Answer: A
Rationale: Working radius is measured horizontally from the crane's axis of rotation
to the vertical line through the load, and it directly affects the crane's rated capacity.
6. As the radius of a crane's load increases (boom lowered further from
vertical), what generally happens to the rated capacity?
A. It increases
B. It decreases
C. It stays the same
D. It becomes unlimited
Correct Answer: B
Rationale: As radius increases, the overturning moment on the crane increases, so
the rated capacity the crane can safely lift decreases.
,7. What is the purpose of outriggers on a mobile crane?
A. To increase the boom's maximum length
B. To widen the crane's effective base and provide stability during lifting
C. To reduce the weight of the counterweight needed
D. To allow the crane to travel at higher speeds
Correct Answer: B
Rationale: Outriggers extend and set down to widen the crane's support base,
which increases stability and allows for higher rated capacities than lifting on
rubber.
8. What should be done before extending a crane's outriggers?
A. Nothing special is required
B. Verify the ground conditions can support the imposed loads and use
cribbing/mats as needed
C. Only extend them after the boom is fully raised
D. Remove all counterweight first
Correct Answer: B
Rationale: Ground bearing capacity must be verified and adequate cribbing or
outrigger pads used, since inadequate ground support can cause outrigger float
and tip-over.
9. What is 'boom deflection'?
A. The bending or flexing of the boom under load
B. The rotation of the crane's superstructure
C. The extension of telescoping boom sections
D. The angle between the boom and the load line
Correct Answer: A
Rationale: Boom deflection is the natural bending of the boom that occurs as load is
applied; excessive or unexpected deflection can signal an overload condition.
, 10. A two-block condition occurs when:
A. The load block contacts the boom tip (or auxiliary sheave) causing possible
failure
B. Two cranes lift the same load together
C. The boom is telescoped to two sections
D. Two outriggers are set on the same mat
Correct Answer: A
Rationale: Two-blocking happens when the hook block runs up into the boom tip
sheaves; this can part the wire rope or damage the boom and is a serious hazard.
11. What device is designed to prevent a two-block condition?
A. Load moment indicator
B. Anti-two-block device
C. Boom angle indicator
D. Outrigger pressure gauge
Correct Answer: B
Rationale: An anti-two-block device automatically stops hoisting or telescoping
motion (or warns the operator) before the block contacts the boom tip.
12. What is a Load Moment Indicator (LMI) used for?
A. Measuring wind speed at the boom tip
B. Providing the operator with real-time information on load, radius, and
percentage of rated capacity
C. Automatically rigging the load
D. Calculating the ground bearing pressure
Correct Answer: B
Rationale: An LMI system continuously computes and displays the load, radius, and
percent of capacity being used, helping the operator avoid overloads.
