NCCCO LATTICE BOOM GENERAL
KNOWLEDGE EXAM 2026/2027 –
300 REAL PRACTICE QUESTIONS
WITH VERIFIED ANSWERS &
DETAILED RATIONALES | ALREADY
GRADED A+ | LAT CERTIFICATION
TEST BANK
Section 1: Crane Components & Terminology (Questions
1–40)
1. On a lattice boom crawler crane, the main boom length is measured from
which points?
A. The center of the boom heel pins to the center of the boom tip sheave
B. The base of the boom to the tip of the jib
C. The turntable center to the boom tip
D. The ground to the boom tip
Correct Answer: A – The main boom length is measured from the center of the
boom heel pins to the center of the boom tip sheave. This point is a fixed reference
on the ground, allowing for accurate boom length calculations and setup.
2. What is the primary function of a live mast (gantry) on a conventional lattice
boom crawler crane?
A. To support the boom suspension pendants and distribute the structural load from
the boom tip back to the upper works and counterweights
B. To store extra wire rope for the hoist drum
C. To act as a mounting bracket for the operator cab door
D. To drive the crawler tracks during travel maneuvers
Correct Answer: A – The live mast works in tandem with the boom hoist pendants
to provide the proper mechanical angle and support required to handle heavy boom
lengths and lifting loads.
,3. What is the main purpose of mid-point suspension pendants on a lattice
boom crane?
A. To absorb shock that comes with dynamic loading
B. To increase the crane's leverage on the boom
C. To support the boom during assembly
D. To reduce the weight of the boom
Correct Answer: A – Mid-point suspension pendants absorb shock that comes with
dynamic loading during lifting operations. They help distribute the load along the
boom and reduce stress on the boom sections.
4. The device that automatically stops the boom when it nears the maximum
angle is called the:
A. Boom hoist limit switch
B. Boom hoist kick out
C. Anti-two block device
D. Load moment indicator
Correct Answer: B – The boom hoist kick out automatically stops the boom when it
nears the maximum angle, preventing the boom from being raised beyond its safe
operating limit.
5. What is the main purpose of a jib or extension on a lattice boom crane?
A. To extend reach higher or up and over obstacles
B. To increase the crane's lifting capacity
C. To reduce the weight of the main boom
D. To stabilize the crane during lifting
Correct Answer: A – The primary purpose of a jib or extension is to extend the
crane's reach higher or up and over obstacles.
6. What is the definition of "cantilever" on a lattice boom crane?
A. The boom resting on the ground during assembly
B. The boom suspended past the pendant connections
C. The boom fully extended vertically
D. The boom folded for transport
Correct Answer: B – Cantilever refers to the unsupported section of the boom that
extends past the pendant connections.
7. The "upper-works" or "superstructure" of a crane refers to:
A. The track or carrier assembly
B. The area of the crane above the turntable including the cab, boom, and
counterweight
,C. The boom tip section only
D. The wire rope and rigging
Correct Answer: B – The superstructure is the area of the crane above the turntable,
which includes the cab, boom, counterweight, and all rotating components.
8. The Lattice Boom Crane's primary structural advantage over a telescopic
boom of similar length is:
A. Greater horizontal reach due to reduced deflection
B. Superior lift capacity relative to its own weight
C. Faster erection time on site
D. Lower manufacturing cost per unit of length
Correct Answer: B – The lattice boom's truss-like structure provides an exceptional
strength-to-weight ratio. By distributing loads through axial members rather than
bending moments, it achieves greater rigidity and capacity for a given weight
compared to a solid telescopic section.
9. The tipping axis of a crawler crane depends on:
A. The length of the boom
B. Whether the idler or sprocket are in line or offset from the track rollers
C. The weight of the load
D. The ground conditions
Correct Answer: B – The tipping axis of a crawler crane depends on whether the
idler or sprocket are in line or offset from the track rollers.
10. Boom length on a lattice boom crane is defined as the distance from:
A. The base of the cab to the boom tip
B. The center of the boom attachment pin to the center of the boom tip sheaves
C. The ground to the boom tip
D. The counterweight to the boom tip
Correct Answer: B – Boom length is defined as the distance from the center of the
boom attachment pin (heel pin, foot pin, pivot pin) to the center of the boom tip
sheaves.
11. What is the primary function of the load moment indicator (LMI) on a
lattice boom crane?
A. To measure the boom angle
B. To warn the operator when the load approaches the crane's rated capacity
C. To control the hoist speed
D. To monitor wind speed
, Correct Answer: B – The LMI continuously monitors the load moment (load weight
× radius) and provides a warning when the crane is approaching its rated capacity,
helping prevent tipping or structural failure.
12. On a lattice boom crane, what component is responsible for transmitting
the load from the boom tip to the upper works?
A. The hoist drum
B. The pendant lines
C. The turntable bearing
D. The crawler tracks
Correct Answer: B – Pendant lines (boom suspension cables) connect the boom tip
to the gantry or mast, transmitting the load from the boom tip back to the upper
works and counterweights.
13. What is the purpose of the boom foot pin?
A. To connect the boom to the turntable
B. To connect boom sections together
C. To attach the jib
D. To anchor the pendant lines
Correct Answer: A – The boom foot pin (heel pin) connects the base of the boom to
the turntable, allowing the boom to pivot.
14. In a lattice boom crane, what is a "lacing"?
A. The wire rope used for hoisting
B. The diagonal and horizontal members that connect the boom chords
C. The hydraulic hoses
D. The electrical wiring
Correct Answer: B – Lacing refers to the diagonal and horizontal structural members
that connect the main chords (corner members) of the lattice boom, providing
rigidity and transferring shear forces.
15. What is the function of the counterweight on a lattice boom crawler crane?
A. To increase the lifting capacity
B. To provide stability by counteracting the load moment
C. To power the crawler tracks
D. To support the boom
Correct Answer: B – The counterweight provides stability by counteracting the
overturning moment created by the load, helping prevent tipping.
16. What is the purpose of the swing lock on a lattice boom crane?
A. To lock the boom in position
KNOWLEDGE EXAM 2026/2027 –
300 REAL PRACTICE QUESTIONS
WITH VERIFIED ANSWERS &
DETAILED RATIONALES | ALREADY
GRADED A+ | LAT CERTIFICATION
TEST BANK
Section 1: Crane Components & Terminology (Questions
1–40)
1. On a lattice boom crawler crane, the main boom length is measured from
which points?
A. The center of the boom heel pins to the center of the boom tip sheave
B. The base of the boom to the tip of the jib
C. The turntable center to the boom tip
D. The ground to the boom tip
Correct Answer: A – The main boom length is measured from the center of the
boom heel pins to the center of the boom tip sheave. This point is a fixed reference
on the ground, allowing for accurate boom length calculations and setup.
2. What is the primary function of a live mast (gantry) on a conventional lattice
boom crawler crane?
A. To support the boom suspension pendants and distribute the structural load from
the boom tip back to the upper works and counterweights
B. To store extra wire rope for the hoist drum
C. To act as a mounting bracket for the operator cab door
D. To drive the crawler tracks during travel maneuvers
Correct Answer: A – The live mast works in tandem with the boom hoist pendants
to provide the proper mechanical angle and support required to handle heavy boom
lengths and lifting loads.
,3. What is the main purpose of mid-point suspension pendants on a lattice
boom crane?
A. To absorb shock that comes with dynamic loading
B. To increase the crane's leverage on the boom
C. To support the boom during assembly
D. To reduce the weight of the boom
Correct Answer: A – Mid-point suspension pendants absorb shock that comes with
dynamic loading during lifting operations. They help distribute the load along the
boom and reduce stress on the boom sections.
4. The device that automatically stops the boom when it nears the maximum
angle is called the:
A. Boom hoist limit switch
B. Boom hoist kick out
C. Anti-two block device
D. Load moment indicator
Correct Answer: B – The boom hoist kick out automatically stops the boom when it
nears the maximum angle, preventing the boom from being raised beyond its safe
operating limit.
5. What is the main purpose of a jib or extension on a lattice boom crane?
A. To extend reach higher or up and over obstacles
B. To increase the crane's lifting capacity
C. To reduce the weight of the main boom
D. To stabilize the crane during lifting
Correct Answer: A – The primary purpose of a jib or extension is to extend the
crane's reach higher or up and over obstacles.
6. What is the definition of "cantilever" on a lattice boom crane?
A. The boom resting on the ground during assembly
B. The boom suspended past the pendant connections
C. The boom fully extended vertically
D. The boom folded for transport
Correct Answer: B – Cantilever refers to the unsupported section of the boom that
extends past the pendant connections.
7. The "upper-works" or "superstructure" of a crane refers to:
A. The track or carrier assembly
B. The area of the crane above the turntable including the cab, boom, and
counterweight
,C. The boom tip section only
D. The wire rope and rigging
Correct Answer: B – The superstructure is the area of the crane above the turntable,
which includes the cab, boom, counterweight, and all rotating components.
8. The Lattice Boom Crane's primary structural advantage over a telescopic
boom of similar length is:
A. Greater horizontal reach due to reduced deflection
B. Superior lift capacity relative to its own weight
C. Faster erection time on site
D. Lower manufacturing cost per unit of length
Correct Answer: B – The lattice boom's truss-like structure provides an exceptional
strength-to-weight ratio. By distributing loads through axial members rather than
bending moments, it achieves greater rigidity and capacity for a given weight
compared to a solid telescopic section.
9. The tipping axis of a crawler crane depends on:
A. The length of the boom
B. Whether the idler or sprocket are in line or offset from the track rollers
C. The weight of the load
D. The ground conditions
Correct Answer: B – The tipping axis of a crawler crane depends on whether the
idler or sprocket are in line or offset from the track rollers.
10. Boom length on a lattice boom crane is defined as the distance from:
A. The base of the cab to the boom tip
B. The center of the boom attachment pin to the center of the boom tip sheaves
C. The ground to the boom tip
D. The counterweight to the boom tip
Correct Answer: B – Boom length is defined as the distance from the center of the
boom attachment pin (heel pin, foot pin, pivot pin) to the center of the boom tip
sheaves.
11. What is the primary function of the load moment indicator (LMI) on a
lattice boom crane?
A. To measure the boom angle
B. To warn the operator when the load approaches the crane's rated capacity
C. To control the hoist speed
D. To monitor wind speed
, Correct Answer: B – The LMI continuously monitors the load moment (load weight
× radius) and provides a warning when the crane is approaching its rated capacity,
helping prevent tipping or structural failure.
12. On a lattice boom crane, what component is responsible for transmitting
the load from the boom tip to the upper works?
A. The hoist drum
B. The pendant lines
C. The turntable bearing
D. The crawler tracks
Correct Answer: B – Pendant lines (boom suspension cables) connect the boom tip
to the gantry or mast, transmitting the load from the boom tip back to the upper
works and counterweights.
13. What is the purpose of the boom foot pin?
A. To connect the boom to the turntable
B. To connect boom sections together
C. To attach the jib
D. To anchor the pendant lines
Correct Answer: A – The boom foot pin (heel pin) connects the base of the boom to
the turntable, allowing the boom to pivot.
14. In a lattice boom crane, what is a "lacing"?
A. The wire rope used for hoisting
B. The diagonal and horizontal members that connect the boom chords
C. The hydraulic hoses
D. The electrical wiring
Correct Answer: B – Lacing refers to the diagonal and horizontal structural members
that connect the main chords (corner members) of the lattice boom, providing
rigidity and transferring shear forces.
15. What is the function of the counterweight on a lattice boom crawler crane?
A. To increase the lifting capacity
B. To provide stability by counteracting the load moment
C. To power the crawler tracks
D. To support the boom
Correct Answer: B – The counterweight provides stability by counteracting the
overturning moment created by the load, helping prevent tipping.
16. What is the purpose of the swing lock on a lattice boom crane?
A. To lock the boom in position
