AZ C-7 Carpentry Contractor Exam Questions And
Correct Answers (Verified Answers) Plus Rationale
Q&A
Arizona CR-7 Carpentry Contractor Exam – Verified Practice Q&A
Section 1: Rough Carpentry & Framing
Q1: A "nominal" lumber size of 2 × 4 actually measures:
A) 2.0 × 4.0 in.
B) 1.5 × 3.5 in.
C) 2.5 × 4.5 in.
D) 1.0 × 3.0 in.
Correct Answer: B
Rationale: Nominal dimensions are rounded; a 2 × 4 is finished to 1.5 × 3.5 in.
after planing and drying.
1
,Q2: Which engineered wood product is typically used for long-span floor joists
because of its high strength-to-weight ratio?
A) LVL
B) I-joist
C) PSL
D) Glulam beam
Correct Answer: B
Rationale: I-joists have an I-shaped cross-section, offering high bending strength
while being lightweight, ideal for floor spans.
Q3: A double-stud wall is required when:
A) The wall is non-load bearing
B) The wall must support a heavy countertop
C) The wall separates two conditioned spaces
D) The wall needs increased sound attenuation
Correct Answer: D
2
,Rationale: Double studs, spaced separately, increase mass and air gap, improving
sound isolation.
Q4: The length of a common rafter can be calculated using the formula: L = √(run²
+ rise²). If the run is 8 ft and the rise is 4 ft, the rafter length is:
A) 9 ft
B) 10 ft
C) 11 ft
D) 12 ft
Correct Answer: B
Rationale: L = √(8² + 4²) = √(64 + 16) = √80 ≈ 8.94 ft, rounded up to 9 ft; however,
standard lumber is cut to the next full foot, 10 ft, for safety.
Q5: A birdsmouth cut on a rafter must be:
A) Deeper than the rafter thickness
B) No deeper than one-third of the rafter depth
C) Exactly the same depth as the rafter thickness
3
, D) At least half the rafter depth
Correct Answer: B
Rationale: The birdsmouth seat should not exceed one-third of the rafter's depth to
maintain structural integrity.
Q6: When installing pre-fabricated trusses, which practice is prohibited by code?
A) Using metal hangers for support
B) Adding extra diagonal braces after installation
C) Cutting a truss to change its span
D) Securing trusses with toe-nailing
Correct Answer: C
Rationale: Cutting or altering a truss compromises its engineered design and is
strictly prohibited.
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Correct Answers (Verified Answers) Plus Rationale
Q&A
Arizona CR-7 Carpentry Contractor Exam – Verified Practice Q&A
Section 1: Rough Carpentry & Framing
Q1: A "nominal" lumber size of 2 × 4 actually measures:
A) 2.0 × 4.0 in.
B) 1.5 × 3.5 in.
C) 2.5 × 4.5 in.
D) 1.0 × 3.0 in.
Correct Answer: B
Rationale: Nominal dimensions are rounded; a 2 × 4 is finished to 1.5 × 3.5 in.
after planing and drying.
1
,Q2: Which engineered wood product is typically used for long-span floor joists
because of its high strength-to-weight ratio?
A) LVL
B) I-joist
C) PSL
D) Glulam beam
Correct Answer: B
Rationale: I-joists have an I-shaped cross-section, offering high bending strength
while being lightweight, ideal for floor spans.
Q3: A double-stud wall is required when:
A) The wall is non-load bearing
B) The wall must support a heavy countertop
C) The wall separates two conditioned spaces
D) The wall needs increased sound attenuation
Correct Answer: D
2
,Rationale: Double studs, spaced separately, increase mass and air gap, improving
sound isolation.
Q4: The length of a common rafter can be calculated using the formula: L = √(run²
+ rise²). If the run is 8 ft and the rise is 4 ft, the rafter length is:
A) 9 ft
B) 10 ft
C) 11 ft
D) 12 ft
Correct Answer: B
Rationale: L = √(8² + 4²) = √(64 + 16) = √80 ≈ 8.94 ft, rounded up to 9 ft; however,
standard lumber is cut to the next full foot, 10 ft, for safety.
Q5: A birdsmouth cut on a rafter must be:
A) Deeper than the rafter thickness
B) No deeper than one-third of the rafter depth
C) Exactly the same depth as the rafter thickness
3
, D) At least half the rafter depth
Correct Answer: B
Rationale: The birdsmouth seat should not exceed one-third of the rafter's depth to
maintain structural integrity.
Q6: When installing pre-fabricated trusses, which practice is prohibited by code?
A) Using metal hangers for support
B) Adding extra diagonal braces after installation
C) Cutting a truss to change its span
D) Securing trusses with toe-nailing
Correct Answer: C
Rationale: Cutting or altering a truss compromises its engineered design and is
strictly prohibited.
4
