CO Structural Steel Contractor Exam
Questions and Correct Answers (Verified
Answers) Plus Rationale 2027 Q&A|
Instant Download Pdf
1. Which property of structural steel allows it to deform significantly
before failure?
A. Brittleness
B. Ductility
C. Porosity
D. Permeability
Rationale: Ductility is the ability of a material to undergo substantial
plastic deformation before rupture. This property is important in
structural steel because it provides warning before failure and allows
structures to redistribute stresses.
2. What is the primary purpose of a structural steel shop drawing?
,A. To replace the contract documents
B. To determine the contractor's tax liability
C. To provide detailed fabrication and erection information
D. To establish the building's occupancy classification
Rationale: Shop drawings show dimensions, connections, member
identification, fabrication details, and other information needed to
manufacture and erect steel components. They supplement, rather
than replace, the design documents.
3. Which steel shape is commonly identified by its nominal depth
and weight per foot?
A. Angle
B. Plate
C. W-shape
D. Round bar
Rationale: Wide-flange W-shapes are commonly designated by
nominal depth followed by weight per foot, such as W18×35. The
designation helps identify the member's general size and mass.
4. What is the main function of a structural steel column?
A. Resist only horizontal loads
B. Transfer primarily axial loads to the foundation
,C. Provide waterproofing
D. Prevent concrete shrinkage
Rationale: Columns primarily carry compression and transfer loads
from beams, floors, and roofs downward into the foundation.
Depending on the structural system, they may also resist bending and
lateral forces.
5. What does the term “yield strength” describe?
A. The density of steel
B. The melting temperature of steel
C. The stress at which significant permanent deformation begins
D. The maximum temperature permitted during welding
Rationale: Yield strength represents the approximate stress level at
which steel transitions from primarily elastic behavior to plastic
deformation. Structural design uses yield strength as a key material
property.
6. Which type of connection transfers forces through bolts bearing
against the connected material?
A. Adhesive connection
B. Bearing-type bolted connection
, C. Welded connection
D. Riveted-only connection
Rationale: In a bearing-type bolted connection, load is transferred
through the bolt and bearing between the bolt and the connected
material. Proper bolt installation and hole dimensions are essential.
7. What is the purpose of a gusset plate?
A. To provide fireproofing
B. To serve as roofing membrane
C. To connect structural members and transfer forces between them
D. To eliminate the need for bolts
Rationale: Gusset plates are commonly used at truss, brace, and
framing connections. They provide a structural interface through
which forces can be transferred among connected members.
8. Which welding process uses a continuously fed consumable wire
electrode?
A. SMAW
B. GTAW
C. GMAW
D. Oxyfuel welding
Questions and Correct Answers (Verified
Answers) Plus Rationale 2027 Q&A|
Instant Download Pdf
1. Which property of structural steel allows it to deform significantly
before failure?
A. Brittleness
B. Ductility
C. Porosity
D. Permeability
Rationale: Ductility is the ability of a material to undergo substantial
plastic deformation before rupture. This property is important in
structural steel because it provides warning before failure and allows
structures to redistribute stresses.
2. What is the primary purpose of a structural steel shop drawing?
,A. To replace the contract documents
B. To determine the contractor's tax liability
C. To provide detailed fabrication and erection information
D. To establish the building's occupancy classification
Rationale: Shop drawings show dimensions, connections, member
identification, fabrication details, and other information needed to
manufacture and erect steel components. They supplement, rather
than replace, the design documents.
3. Which steel shape is commonly identified by its nominal depth
and weight per foot?
A. Angle
B. Plate
C. W-shape
D. Round bar
Rationale: Wide-flange W-shapes are commonly designated by
nominal depth followed by weight per foot, such as W18×35. The
designation helps identify the member's general size and mass.
4. What is the main function of a structural steel column?
A. Resist only horizontal loads
B. Transfer primarily axial loads to the foundation
,C. Provide waterproofing
D. Prevent concrete shrinkage
Rationale: Columns primarily carry compression and transfer loads
from beams, floors, and roofs downward into the foundation.
Depending on the structural system, they may also resist bending and
lateral forces.
5. What does the term “yield strength” describe?
A. The density of steel
B. The melting temperature of steel
C. The stress at which significant permanent deformation begins
D. The maximum temperature permitted during welding
Rationale: Yield strength represents the approximate stress level at
which steel transitions from primarily elastic behavior to plastic
deformation. Structural design uses yield strength as a key material
property.
6. Which type of connection transfers forces through bolts bearing
against the connected material?
A. Adhesive connection
B. Bearing-type bolted connection
, C. Welded connection
D. Riveted-only connection
Rationale: In a bearing-type bolted connection, load is transferred
through the bolt and bearing between the bolt and the connected
material. Proper bolt installation and hole dimensions are essential.
7. What is the purpose of a gusset plate?
A. To provide fireproofing
B. To serve as roofing membrane
C. To connect structural members and transfer forces between them
D. To eliminate the need for bolts
Rationale: Gusset plates are commonly used at truss, brace, and
framing connections. They provide a structural interface through
which forces can be transferred among connected members.
8. Which welding process uses a continuously fed consumable wire
electrode?
A. SMAW
B. GTAW
C. GMAW
D. Oxyfuel welding
