LATTICE BOOM CRANES EXAM1|2026|2027
UPDATES|150 QUESTIONS AND VERIFIED
ANSWERS WITH DETAILED RATIONALES |
GRADED A+|ASSURED PASS
Introduction
A lattice boom is a crane boom constructed as an open truss framework of steel
chords connected by diagonal and horizontal bracing, rather than a solid box or
tubular section. Lattice boom cranes are widely used in heavy civil, industrial,
marine, and infrastructure lifting because they offer high strength-to-weight ratios,
long reaches, and modular assembly. This question bank covers lattice boom
fundamentals, components, terminology, advantages/disadvantages,
applications, assembly, load charts, safety, inspection, maintenance,
comparison with telescopic booms, and advanced concepts.
Section 1: Fundamentals and Basic Concepts
1. What is a lattice boom primarily constructed as?
A. A solid box section
B. A truss framework of steel chords and bracing
C. A hydraulic telescopic tube
D. A reinforced concrete beam
Answer: 2 (B)
Rationale: A lattice boom is an open truss framework made of steel chords
connected by diagonal and horizontal bracing, not a solid section.
2. Which material is most commonly used for lattice boom construction?
A. Aluminum
,B. Timber
C. High-strength steel
D. Carbon fiber
Answer: 3 (C)
Rationale: High-strength steel is the standard material due to its strength,
durability, and weldability.
3. The main longitudinal members of a lattice boom are called:
A. Chords
B. Diagonals
C. Gussets
D. Pins
Answer: 1 (A)
Rationale: Chords are the main longitudinal load-carrying members of the truss.
4. The diagonal and horizontal members that connect the chords are called:
A. Chords
B. Bracing
C. Pins
D. Sheaves
Answer: 2 (B)
Rationale: Bracing provides stability and transfers shear between the chords.
5. What is the primary advantage of a lattice boom over a solid boom?
A. Faster setup
B. Higher strength-to-weight ratio
C. Lower skill requirement
D. Better for road travel
,Answer: 2 (B)
Rationale: The open truss design gives a much higher strength-to-weight ratio
than solid booms.
6. Which crane type most commonly uses a lattice boom?
A. Crawler crane
B. Forklift
C. Boom truck with telescopic boom
D. Aerial work platform
Answer: 1 (A)
Rationale: Crawler cranes are the classic lattice boom crane type.
7. Lattice booms are typically assembled:
A. In the factory only
B. On-site, section by section
C. By hydraulic extension
D. By welding on the crane
Answer: 2 (B)
Rationale: Lattice booms are modular and assembled on-site from sections/inserts.
8. What is a "boom section" or "insert" in a lattice boom?
A. A hydraulic cylinder
B. A modular segment added to increase boom length
C. A counterweight block
D. A type of hook
Answer: 2 (B)
Rationale: Inserts are modular lattice segments used to build up boom length.
9. The pivot point at the base of a lattice boom is called the:
A. Boom tip
, B. Boom foot
C. Jib
D. Mast
Answer: 2 (B)
Rationale: The boom foot is the pivot point where the boom attaches to the crane
base.
10. An extension at the tip of a lattice boom is called a:
A. Jib
B. Chord
C. Gusset
D. Counterweight
Answer: 1 (A)
Rationale: A jib is an extension mounted at the boom tip for additional reach.
Section 2: Components and Terminology
11. What is a "luffing jib"?
A. A fixed jib
B. An adjustable-angle jib on a lattice boom
C. A hydraulic telescopic section
D. A counterweight
Answer: 2 (B)
Rationale: A luffing jib can be angled independently to adjust radius and reach.
12. The term "boom angle" refers to:
A. The angle of the hook
B. The angle of the boom relative to horizontal
C. The angle of the counterweight
D. The angle of the outriggers
UPDATES|150 QUESTIONS AND VERIFIED
ANSWERS WITH DETAILED RATIONALES |
GRADED A+|ASSURED PASS
Introduction
A lattice boom is a crane boom constructed as an open truss framework of steel
chords connected by diagonal and horizontal bracing, rather than a solid box or
tubular section. Lattice boom cranes are widely used in heavy civil, industrial,
marine, and infrastructure lifting because they offer high strength-to-weight ratios,
long reaches, and modular assembly. This question bank covers lattice boom
fundamentals, components, terminology, advantages/disadvantages,
applications, assembly, load charts, safety, inspection, maintenance,
comparison with telescopic booms, and advanced concepts.
Section 1: Fundamentals and Basic Concepts
1. What is a lattice boom primarily constructed as?
A. A solid box section
B. A truss framework of steel chords and bracing
C. A hydraulic telescopic tube
D. A reinforced concrete beam
Answer: 2 (B)
Rationale: A lattice boom is an open truss framework made of steel chords
connected by diagonal and horizontal bracing, not a solid section.
2. Which material is most commonly used for lattice boom construction?
A. Aluminum
,B. Timber
C. High-strength steel
D. Carbon fiber
Answer: 3 (C)
Rationale: High-strength steel is the standard material due to its strength,
durability, and weldability.
3. The main longitudinal members of a lattice boom are called:
A. Chords
B. Diagonals
C. Gussets
D. Pins
Answer: 1 (A)
Rationale: Chords are the main longitudinal load-carrying members of the truss.
4. The diagonal and horizontal members that connect the chords are called:
A. Chords
B. Bracing
C. Pins
D. Sheaves
Answer: 2 (B)
Rationale: Bracing provides stability and transfers shear between the chords.
5. What is the primary advantage of a lattice boom over a solid boom?
A. Faster setup
B. Higher strength-to-weight ratio
C. Lower skill requirement
D. Better for road travel
,Answer: 2 (B)
Rationale: The open truss design gives a much higher strength-to-weight ratio
than solid booms.
6. Which crane type most commonly uses a lattice boom?
A. Crawler crane
B. Forklift
C. Boom truck with telescopic boom
D. Aerial work platform
Answer: 1 (A)
Rationale: Crawler cranes are the classic lattice boom crane type.
7. Lattice booms are typically assembled:
A. In the factory only
B. On-site, section by section
C. By hydraulic extension
D. By welding on the crane
Answer: 2 (B)
Rationale: Lattice booms are modular and assembled on-site from sections/inserts.
8. What is a "boom section" or "insert" in a lattice boom?
A. A hydraulic cylinder
B. A modular segment added to increase boom length
C. A counterweight block
D. A type of hook
Answer: 2 (B)
Rationale: Inserts are modular lattice segments used to build up boom length.
9. The pivot point at the base of a lattice boom is called the:
A. Boom tip
, B. Boom foot
C. Jib
D. Mast
Answer: 2 (B)
Rationale: The boom foot is the pivot point where the boom attaches to the crane
base.
10. An extension at the tip of a lattice boom is called a:
A. Jib
B. Chord
C. Gusset
D. Counterweight
Answer: 1 (A)
Rationale: A jib is an extension mounted at the boom tip for additional reach.
Section 2: Components and Terminology
11. What is a "luffing jib"?
A. A fixed jib
B. An adjustable-angle jib on a lattice boom
C. A hydraulic telescopic section
D. A counterweight
Answer: 2 (B)
Rationale: A luffing jib can be angled independently to adjust radius and reach.
12. The term "boom angle" refers to:
A. The angle of the hook
B. The angle of the boom relative to horizontal
C. The angle of the counterweight
D. The angle of the outriggers
