AK Structural Iron & Steel
Contractor Exam Questions And
Correct Answers (Verified Answers)
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1. What is the primary purpose of structural steel in construction?
A. Decorative finish
B. Thermal insulation
C. Load-bearing support
D. Soundproofing
Answer: C
Rationale: Structural steel is used primarily for load-bearing support
due to its high strength-to-weight ratio and durability.
2. Which type of steel is commonly used in reinforced concrete
structures?
A. Stainless steel
B. Carbon steel rebar
C. Tool steel
D. Alloy steel
Answer: B
Rationale: Carbon steel rebar provides tensile strength to reinforced
concrete structures.
3. The yield strength of structural steel indicates:
A. Maximum elongation
B. Stress at which steel begins to deform plastically
C. Hardness of steel
, D. Fatigue resistance
Answer: B
Rationale: Yield strength defines the stress level at which steel
transitions from elastic to plastic deformation.
4. Which welding method is most suitable for heavy structural steel
members?
A. Oxy-fuel welding
B. Shielded Metal Arc Welding (SMAW)
C. Soldering
D. Gas metal arc welding for thin sheets
Answer: B
Rationale: SMAW provides deep penetration and strong welds suitable
for thick structural steel.
5. Which structural shape is most efficient in resisting bending in beams?
A. Flat plate
B. I-beam
C. Square tube
D. Angle iron
Answer: B
Rationale: I-beams maximize resistance to bending by concentrating
material away from the neutral axis.
6. What is the minimum clearance for steel columns from combustible
materials according to OSHA standards?
A. 1 inch
B. 2 inches
C. 3 inches
D. 4 inches
Answer: C
Rationale: A minimum of 3 inches is required to prevent fire hazards
and allow inspection.
7. Which factor affects the choice of bolt size in structural connections?
A. Color of steel
B. Load requirements
C. Surface finish
D. Welding type
Answer: B
, Rationale: Bolt size is selected based on the forces the connection must
safely transfer.
8. What is the primary purpose of gusset plates in steel structures?
A. Aesthetic enhancement
B. Vibration damping
C. Connecting beams and trusses at joints
D. Reducing weight
Answer: C
Rationale: Gusset plates provide reinforcement at connection points in
trusses or frames.
9. Which type of corrosion is most common in structural steel exposed to
weather?
A. Galvanic
B. Uniform surface corrosion
C. Pitting
D. Intergranular
Answer: B
Rationale: Uniform corrosion occurs evenly on exposed steel surfaces
due to atmospheric moisture.
10. The purpose of a camber in steel beams is to:
A. Reduce weight
B. Counteract deflection under load
C. Aid in welding
D. Increase aesthetic appeal
Answer: B
Rationale: Cambering pre-bends beams to offset anticipated deflection
when loaded.
11. What is the typical minimum thickness of structural steel plates
used in bridges?
A. 5 mm
B. 10 mm
C. 12 mm
D. 25 mm
Answer: C
Rationale: Bridge plates are generally a minimum of 12 mm to safely
resist heavy loads.
Contractor Exam Questions And
Correct Answers (Verified Answers)
Plus Rationale2026 Q&A| Instant
Download Pdf
1. What is the primary purpose of structural steel in construction?
A. Decorative finish
B. Thermal insulation
C. Load-bearing support
D. Soundproofing
Answer: C
Rationale: Structural steel is used primarily for load-bearing support
due to its high strength-to-weight ratio and durability.
2. Which type of steel is commonly used in reinforced concrete
structures?
A. Stainless steel
B. Carbon steel rebar
C. Tool steel
D. Alloy steel
Answer: B
Rationale: Carbon steel rebar provides tensile strength to reinforced
concrete structures.
3. The yield strength of structural steel indicates:
A. Maximum elongation
B. Stress at which steel begins to deform plastically
C. Hardness of steel
, D. Fatigue resistance
Answer: B
Rationale: Yield strength defines the stress level at which steel
transitions from elastic to plastic deformation.
4. Which welding method is most suitable for heavy structural steel
members?
A. Oxy-fuel welding
B. Shielded Metal Arc Welding (SMAW)
C. Soldering
D. Gas metal arc welding for thin sheets
Answer: B
Rationale: SMAW provides deep penetration and strong welds suitable
for thick structural steel.
5. Which structural shape is most efficient in resisting bending in beams?
A. Flat plate
B. I-beam
C. Square tube
D. Angle iron
Answer: B
Rationale: I-beams maximize resistance to bending by concentrating
material away from the neutral axis.
6. What is the minimum clearance for steel columns from combustible
materials according to OSHA standards?
A. 1 inch
B. 2 inches
C. 3 inches
D. 4 inches
Answer: C
Rationale: A minimum of 3 inches is required to prevent fire hazards
and allow inspection.
7. Which factor affects the choice of bolt size in structural connections?
A. Color of steel
B. Load requirements
C. Surface finish
D. Welding type
Answer: B
, Rationale: Bolt size is selected based on the forces the connection must
safely transfer.
8. What is the primary purpose of gusset plates in steel structures?
A. Aesthetic enhancement
B. Vibration damping
C. Connecting beams and trusses at joints
D. Reducing weight
Answer: C
Rationale: Gusset plates provide reinforcement at connection points in
trusses or frames.
9. Which type of corrosion is most common in structural steel exposed to
weather?
A. Galvanic
B. Uniform surface corrosion
C. Pitting
D. Intergranular
Answer: B
Rationale: Uniform corrosion occurs evenly on exposed steel surfaces
due to atmospheric moisture.
10. The purpose of a camber in steel beams is to:
A. Reduce weight
B. Counteract deflection under load
C. Aid in welding
D. Increase aesthetic appeal
Answer: B
Rationale: Cambering pre-bends beams to offset anticipated deflection
when loaded.
11. What is the typical minimum thickness of structural steel plates
used in bridges?
A. 5 mm
B. 10 mm
C. 12 mm
D. 25 mm
Answer: C
Rationale: Bridge plates are generally a minimum of 12 mm to safely
resist heavy loads.
