Structural Steel Contractor Exam (C-51)
Questions and Correct Answers
(Verified Answers) Plus Rationales 2025
Q&A | Instant Download PDF
Question 1
What is the primary structural advantage of steel compared to wood?
A. It cannot rust.
B. It has a higher strength-to-weight ratio.
C. It does not expand with heat.
D. It is lighter than aluminum.
Correct Answer: B
Rationale:
Steel provides exceptional strength while remaining relatively lightweight
compared to its load-carrying capacity. This high strength-to-weight ratio allows
longer spans and stronger structures. Steel can rust (A), expands with heat (C),
and is heavier than aluminum (D).
Question 2
Which drawing shows the size and location of structural steel members?
A. Plumbing plan
B. Structural drawings
C. Landscape plan
D. Electrical drawing
Correct Answer: B
Rationale:
Structural drawings specify beam sizes, columns, connections, and member
,locations. Plumbing, landscaping, and electrical drawings do not provide
structural framing information.
Question 3
Which steel shape is commonly used as a structural beam?
A. W-shape
B. Pipe
C. Round rod
D. Flat bar
Correct Answer: A
Rationale:
Wide-flange (W) shapes are designed specifically for structural beams because
they efficiently resist bending loads.
Question 4
The "W" designation in W12×26 indicates what?
A. Welded shape
B. Wide-flange shape
C. Weather-resistant steel
D. Wire reinforcement
Correct Answer: B
Rationale:
The letter "W" identifies a wide-flange structural shape commonly used for beams
and columns.
Question 5
What does the second number in W12×26 represent?
,A. Beam length
B. Weight per foot
C. Web thickness
D. Flange width
Correct Answer: B
Rationale:
The second number indicates the weight of the beam in pounds per linear foot.
Question 6
Which tool is commonly used to verify that a steel column is perfectly vertical?
A. Tape measure
B. Plumb bob
C. Chalk line
D. Framing square
Correct Answer: B
Rationale:
A plumb bob checks true vertical alignment during erection.
Question 7
What is the purpose of anchor bolts?
A. Connect drywall
B. Secure steel columns to foundations
C. Attach roofing panels
D. Install insulation
Correct Answer: B
Rationale:
Anchor bolts fasten structural steel columns securely to concrete foundations.
, Question 8
Which connection uses high-strength fasteners instead of welding?
A. Bolted connection
B. Riveted connection
C. Adhesive connection
D. Soldered connection
Correct Answer: A
Rationale:
Bolted connections use high-strength structural bolts to connect steel members.
Question 9
What is the primary purpose of structural welding?
A. Paint steel
B. Permanently join steel members
C. Reduce weight
D. Prevent expansion
Correct Answer: B
Rationale:
Structural welding permanently joins steel members to transfer structural loads.
Question 10
Which organization publishes common structural steel specifications in the United
States?
A. AISC
B. OSHA
C. EPA
D. FEMA
Correct Answer: A
Questions and Correct Answers
(Verified Answers) Plus Rationales 2025
Q&A | Instant Download PDF
Question 1
What is the primary structural advantage of steel compared to wood?
A. It cannot rust.
B. It has a higher strength-to-weight ratio.
C. It does not expand with heat.
D. It is lighter than aluminum.
Correct Answer: B
Rationale:
Steel provides exceptional strength while remaining relatively lightweight
compared to its load-carrying capacity. This high strength-to-weight ratio allows
longer spans and stronger structures. Steel can rust (A), expands with heat (C),
and is heavier than aluminum (D).
Question 2
Which drawing shows the size and location of structural steel members?
A. Plumbing plan
B. Structural drawings
C. Landscape plan
D. Electrical drawing
Correct Answer: B
Rationale:
Structural drawings specify beam sizes, columns, connections, and member
,locations. Plumbing, landscaping, and electrical drawings do not provide
structural framing information.
Question 3
Which steel shape is commonly used as a structural beam?
A. W-shape
B. Pipe
C. Round rod
D. Flat bar
Correct Answer: A
Rationale:
Wide-flange (W) shapes are designed specifically for structural beams because
they efficiently resist bending loads.
Question 4
The "W" designation in W12×26 indicates what?
A. Welded shape
B. Wide-flange shape
C. Weather-resistant steel
D. Wire reinforcement
Correct Answer: B
Rationale:
The letter "W" identifies a wide-flange structural shape commonly used for beams
and columns.
Question 5
What does the second number in W12×26 represent?
,A. Beam length
B. Weight per foot
C. Web thickness
D. Flange width
Correct Answer: B
Rationale:
The second number indicates the weight of the beam in pounds per linear foot.
Question 6
Which tool is commonly used to verify that a steel column is perfectly vertical?
A. Tape measure
B. Plumb bob
C. Chalk line
D. Framing square
Correct Answer: B
Rationale:
A plumb bob checks true vertical alignment during erection.
Question 7
What is the purpose of anchor bolts?
A. Connect drywall
B. Secure steel columns to foundations
C. Attach roofing panels
D. Install insulation
Correct Answer: B
Rationale:
Anchor bolts fasten structural steel columns securely to concrete foundations.
, Question 8
Which connection uses high-strength fasteners instead of welding?
A. Bolted connection
B. Riveted connection
C. Adhesive connection
D. Soldered connection
Correct Answer: A
Rationale:
Bolted connections use high-strength structural bolts to connect steel members.
Question 9
What is the primary purpose of structural welding?
A. Paint steel
B. Permanently join steel members
C. Reduce weight
D. Prevent expansion
Correct Answer: B
Rationale:
Structural welding permanently joins steel members to transfer structural loads.
Question 10
Which organization publishes common structural steel specifications in the United
States?
A. AISC
B. OSHA
C. EPA
D. FEMA
Correct Answer: A
