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 describes its ability to return to
its original shape after the removal of an applied load?
a. Ductility
b. Toughness
c. Elasticity
d. Hardness
Rationale: Elasticity is the ability of steel to undergo deformation
under load and return to its original dimensions when the load is
removed, provided the elastic limit has not been exceeded.
2. What is the primary purpose of a structural steel erection plan?
a. To determine paint colors
b. To calculate employee wages
, c. To establish the sequence and methods for safely assembling
the steel structure
d. To replace shop drawings
Rationale: An erection plan establishes how structural members will
be delivered, lifted, positioned, temporarily braced, and permanently
connected. It helps coordinate the work and maintain stability during
construction.
3. Which type of steel member is commonly used as a primary
horizontal load-carrying member?
a. Angle
b. Plate
c. Wide-flange beam
d. Round bar
Rationale: Wide-flange beams are widely used for beams and columns
because their geometry provides efficient resistance to bending and
axial loads while minimizing unnecessary material.
4. What is the main function of a structural steel column?
a. Resist only corrosion
b. Provide architectural finishes
c. Transfer vertical and other applied loads to the foundation
d. Prevent concrete shrinkage
,Rationale: Columns primarily carry axial compression and may also
resist bending and lateral forces. They transfer loads from beams,
floors, roofs, and other structural elements to the supporting
foundation.
5. What does the term “yield strength” mean?
a. The weight of a steel member
b. The maximum temperature steel can withstand
c. The stress at which significant permanent deformation begins
d. The density of steel
Rationale: Yield strength is the stress level at which steel begins to
undergo permanent plastic deformation. Structural design uses yield
strength as an important measure of material capacity.
6. Which connection uses bolts that are tightened to develop
significant clamping force between connected steel members?
a. Loose-fit connection
b. Pretensioned bolted connection
c. Tack connection
d. Temporary connection
Rationale: Pretensioned bolts are tightened to a specified tension,
creating clamping force between the connected parts. This can
, improve connection behavior and reduce the likelihood of bolt
loosening or slip where required.
7. What is the primary purpose of temporary bracing during steel
erection?
a. Improve the final paint finish
b. Reduce steel weight
c. Maintain structural stability until permanent connections and
bracing are completed
d. Replace foundations
Rationale: A partially erected steel frame may be unstable before all
members and connections are completed. Temporary bracing supports
the structure against construction loads, wind, and other forces during
erection.
8. Which welding process commonly uses a continuously fed wire
electrode and shielding gas?
a. SMAW
b. SAW
c. GMAW
d. Oxyfuel cutting
Questions and Correct Answers (Verified
Answers) Plus Rationale 2027 Q&A|
Instant Download Pdf
1. Which property of structural steel describes its ability to return to
its original shape after the removal of an applied load?
a. Ductility
b. Toughness
c. Elasticity
d. Hardness
Rationale: Elasticity is the ability of steel to undergo deformation
under load and return to its original dimensions when the load is
removed, provided the elastic limit has not been exceeded.
2. What is the primary purpose of a structural steel erection plan?
a. To determine paint colors
b. To calculate employee wages
, c. To establish the sequence and methods for safely assembling
the steel structure
d. To replace shop drawings
Rationale: An erection plan establishes how structural members will
be delivered, lifted, positioned, temporarily braced, and permanently
connected. It helps coordinate the work and maintain stability during
construction.
3. Which type of steel member is commonly used as a primary
horizontal load-carrying member?
a. Angle
b. Plate
c. Wide-flange beam
d. Round bar
Rationale: Wide-flange beams are widely used for beams and columns
because their geometry provides efficient resistance to bending and
axial loads while minimizing unnecessary material.
4. What is the main function of a structural steel column?
a. Resist only corrosion
b. Provide architectural finishes
c. Transfer vertical and other applied loads to the foundation
d. Prevent concrete shrinkage
,Rationale: Columns primarily carry axial compression and may also
resist bending and lateral forces. They transfer loads from beams,
floors, roofs, and other structural elements to the supporting
foundation.
5. What does the term “yield strength” mean?
a. The weight of a steel member
b. The maximum temperature steel can withstand
c. The stress at which significant permanent deformation begins
d. The density of steel
Rationale: Yield strength is the stress level at which steel begins to
undergo permanent plastic deformation. Structural design uses yield
strength as an important measure of material capacity.
6. Which connection uses bolts that are tightened to develop
significant clamping force between connected steel members?
a. Loose-fit connection
b. Pretensioned bolted connection
c. Tack connection
d. Temporary connection
Rationale: Pretensioned bolts are tightened to a specified tension,
creating clamping force between the connected parts. This can
, improve connection behavior and reduce the likelihood of bolt
loosening or slip where required.
7. What is the primary purpose of temporary bracing during steel
erection?
a. Improve the final paint finish
b. Reduce steel weight
c. Maintain structural stability until permanent connections and
bracing are completed
d. Replace foundations
Rationale: A partially erected steel frame may be unstable before all
members and connections are completed. Temporary bracing supports
the structure against construction loads, wind, and other forces during
erection.
8. Which welding process commonly uses a continuously fed wire
electrode and shielding gas?
a. SMAW
b. SAW
c. GMAW
d. Oxyfuel cutting
