CO Carpentry Contractor Exam Questions
and Correct Answers (Verified Answers)
Plus Rationale 2027 Q&A| Instant
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1. Which type of wood movement is primarily caused by changes in
moisture content below the fiber saturation point?
A. Thermal expansion
B. Shrinkage and swelling
C. Chemical expansion
D. Compression set
Rationale: Wood changes dimension as it gains or loses moisture
below the fiber saturation point. Movement is greatest across the
grain, particularly tangentially, while longitudinal movement is
comparatively small.
2. Which framing member typically supports the ends of floor joists
in a platform-framed floor system?
,A. Stud
B. Rafter
C. Rim joist
D. Collar tie
Rationale: The rim joist runs around the perimeter of a floor framing
system and provides lateral support for the ends of the joists. It also
helps transfer loads to the supporting walls.
3. What is the primary purpose of a sill plate anchor bolt?
A. To connect rafters to ridge boards
B. To attach drywall to framing
C. To secure the wood sill plate to the foundation
D. To connect floor joists to subflooring
Rationale: Anchor bolts secure the sill plate to the concrete or
masonry foundation. This connection helps transfer lateral and uplift
forces from the wood-framed structure into the foundation.
4. Which tool is most appropriate for making a long, straight cut
across a large sheet of plywood?
A. Coping saw
B. Keyhole saw
,C. Circular saw
D. Backsaw
Rationale: A circular saw is commonly used for ripping and
crosscutting sheet goods such as plywood. A guide or straightedge can
be used to maintain an accurate cut.
5. What is the primary function of a header installed over a window
or door opening?
A. Prevent moisture absorption
B. Provide a nailing surface for siding only
C. Transfer loads around the opening
D. Reduce thermal expansion
Rationale: A header carries loads that would otherwise be supported
by the studs removed to create the opening. The header transfers
those loads to the supporting jack or trimmer studs.
6. Which framing member directly supports a header at the sides of
a typical framed opening?
A. Cripple stud
B. Jack stud
C. Rafter tie
D. Blocking stud
, Rationale: Jack studs, also called trimmer studs, support the ends of
headers. They are installed alongside full-height king studs at the
sides of the opening.
7. What is the main purpose of a king stud?
A. Support roof sheathing
B. Support the bottom of a stair
C. Provide full-height framing at the side of an opening
D. Connect opposing rafters
Rationale: A king stud generally extends continuously from the
bottom plate to the top plate beside an opening. It works with the
jack stud to create a properly framed opening.
8. Which type of nail is generally preferred for framing connections
because of its greater holding power compared with a finish nail?
A. Brads
B. Finish nails
C. Common framing nails
D. Pin nails
Rationale: Common framing nails have larger shanks and heads than
finish nails or brads. Their greater diameter and length provide
substantial withdrawal and lateral resistance in structural framing.
and Correct Answers (Verified Answers)
Plus Rationale 2027 Q&A| Instant
Download Pdf
1. Which type of wood movement is primarily caused by changes in
moisture content below the fiber saturation point?
A. Thermal expansion
B. Shrinkage and swelling
C. Chemical expansion
D. Compression set
Rationale: Wood changes dimension as it gains or loses moisture
below the fiber saturation point. Movement is greatest across the
grain, particularly tangentially, while longitudinal movement is
comparatively small.
2. Which framing member typically supports the ends of floor joists
in a platform-framed floor system?
,A. Stud
B. Rafter
C. Rim joist
D. Collar tie
Rationale: The rim joist runs around the perimeter of a floor framing
system and provides lateral support for the ends of the joists. It also
helps transfer loads to the supporting walls.
3. What is the primary purpose of a sill plate anchor bolt?
A. To connect rafters to ridge boards
B. To attach drywall to framing
C. To secure the wood sill plate to the foundation
D. To connect floor joists to subflooring
Rationale: Anchor bolts secure the sill plate to the concrete or
masonry foundation. This connection helps transfer lateral and uplift
forces from the wood-framed structure into the foundation.
4. Which tool is most appropriate for making a long, straight cut
across a large sheet of plywood?
A. Coping saw
B. Keyhole saw
,C. Circular saw
D. Backsaw
Rationale: A circular saw is commonly used for ripping and
crosscutting sheet goods such as plywood. A guide or straightedge can
be used to maintain an accurate cut.
5. What is the primary function of a header installed over a window
or door opening?
A. Prevent moisture absorption
B. Provide a nailing surface for siding only
C. Transfer loads around the opening
D. Reduce thermal expansion
Rationale: A header carries loads that would otherwise be supported
by the studs removed to create the opening. The header transfers
those loads to the supporting jack or trimmer studs.
6. Which framing member directly supports a header at the sides of
a typical framed opening?
A. Cripple stud
B. Jack stud
C. Rafter tie
D. Blocking stud
, Rationale: Jack studs, also called trimmer studs, support the ends of
headers. They are installed alongside full-height king studs at the
sides of the opening.
7. What is the main purpose of a king stud?
A. Support roof sheathing
B. Support the bottom of a stair
C. Provide full-height framing at the side of an opening
D. Connect opposing rafters
Rationale: A king stud generally extends continuously from the
bottom plate to the top plate beside an opening. It works with the
jack stud to create a properly framed opening.
8. Which type of nail is generally preferred for framing connections
because of its greater holding power compared with a finish nail?
A. Brads
B. Finish nails
C. Common framing nails
D. Pin nails
Rationale: Common framing nails have larger shanks and heads than
finish nails or brads. Their greater diameter and length provide
substantial withdrawal and lateral resistance in structural framing.
