California Sheet Metal Journeyman
Exam Practice Questions And Correct
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Rationale 2026 Q&A| Instant Download
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1. A sheet metal journeyman is interpreting a blueprint that specifies a
rectangular duct measuring 24 inches by 18 inches. What is the cross-
sectional area of the duct?
A. 360 square inches
B. 432 square inches
C. 400 square inches
D. 450 square inches
Answer: B. 432 square inches
Rationale: The area of a rectangle is calculated by multiplying length by
width. In this case, 24 × 18 = 432 square inches, making option B correct.
, 2. When installing HVAC ductwork, which material is most commonly
used for residential air distribution systems due to its corrosion
resistance and cost efficiency?
A. Copper
B. Galvanized steel
C. Aluminum
D. Cast iron
Answer: B. Galvanized steel
Rationale: Galvanized steel is widely used in HVAC duct systems because it
resists corrosion and is cost-effective compared to other metals.
3. A sheet metal worker is asked to calculate the circumference of a
round duct with a diameter of 10 inches. What is the approximate
circumference? (Use π ≈ 3.14)
A. 15.7 inches
B. 31.4 inches
C. 25.1 inches
D. 28.0 inches
Answer: B. 31.4 inches
Rationale: Circumference is calculated using πd. Therefore, 3.14 × 10 = 31.4
inches.
, 4. Which tool is primarily used to make straight cuts in sheet metal with
minimal distortion?
A. Mallet
B. Aviation snips
C. Folding bar
D. Drift punch
Answer: B. Aviation snips
Rationale: Aviation snips are designed for precise cutting of sheet metal
while minimizing deformation along the cut edge.
5. What is the primary purpose of a sheet metal seam?
A. To increase duct weight
B. To allow thermal expansion only
C. To join two edges of sheet metal securely
D. To reduce airflow velocity
Answer: C. To join two edges of sheet metal securely
Rationale: Seams are used to connect sheet metal pieces together to form
airtight or structurally stable assemblies.
6. Which safety practice is most important when operating a shear
machine?
, A. Wearing loose gloves
B. Keeping hands close to the blade
C. Using proper lockout/tagout procedures
D. Removing all machine guards
Answer: C. Using proper lockout/tagout procedures
Rationale: Lockout/tagout ensures the machine is de-energized before
maintenance or adjustments, preventing accidental startup injuries.
7. In HVAC duct design, what does “CFM” stand for?
A. Cubic Flow Measurement
B. Constant Fan Movement
C. Cubic Feet per Minute
D. Controlled Force Motion
Answer: C. Cubic Feet per Minute
Rationale: CFM measures the volume of air moving through a system per
minute and is essential in HVAC calculations.
8. A 45-degree offset in ductwork requires how many fittings?
A. 1
B. 2
C. 3
D. 4
Exam Practice Questions And Correct
Answers (Verified Answers) Plus
Rationale 2026 Q&A| Instant Download
1. A sheet metal journeyman is interpreting a blueprint that specifies a
rectangular duct measuring 24 inches by 18 inches. What is the cross-
sectional area of the duct?
A. 360 square inches
B. 432 square inches
C. 400 square inches
D. 450 square inches
Answer: B. 432 square inches
Rationale: The area of a rectangle is calculated by multiplying length by
width. In this case, 24 × 18 = 432 square inches, making option B correct.
, 2. When installing HVAC ductwork, which material is most commonly
used for residential air distribution systems due to its corrosion
resistance and cost efficiency?
A. Copper
B. Galvanized steel
C. Aluminum
D. Cast iron
Answer: B. Galvanized steel
Rationale: Galvanized steel is widely used in HVAC duct systems because it
resists corrosion and is cost-effective compared to other metals.
3. A sheet metal worker is asked to calculate the circumference of a
round duct with a diameter of 10 inches. What is the approximate
circumference? (Use π ≈ 3.14)
A. 15.7 inches
B. 31.4 inches
C. 25.1 inches
D. 28.0 inches
Answer: B. 31.4 inches
Rationale: Circumference is calculated using πd. Therefore, 3.14 × 10 = 31.4
inches.
, 4. Which tool is primarily used to make straight cuts in sheet metal with
minimal distortion?
A. Mallet
B. Aviation snips
C. Folding bar
D. Drift punch
Answer: B. Aviation snips
Rationale: Aviation snips are designed for precise cutting of sheet metal
while minimizing deformation along the cut edge.
5. What is the primary purpose of a sheet metal seam?
A. To increase duct weight
B. To allow thermal expansion only
C. To join two edges of sheet metal securely
D. To reduce airflow velocity
Answer: C. To join two edges of sheet metal securely
Rationale: Seams are used to connect sheet metal pieces together to form
airtight or structurally stable assemblies.
6. Which safety practice is most important when operating a shear
machine?
, A. Wearing loose gloves
B. Keeping hands close to the blade
C. Using proper lockout/tagout procedures
D. Removing all machine guards
Answer: C. Using proper lockout/tagout procedures
Rationale: Lockout/tagout ensures the machine is de-energized before
maintenance or adjustments, preventing accidental startup injuries.
7. In HVAC duct design, what does “CFM” stand for?
A. Cubic Flow Measurement
B. Constant Fan Movement
C. Cubic Feet per Minute
D. Controlled Force Motion
Answer: C. Cubic Feet per Minute
Rationale: CFM measures the volume of air moving through a system per
minute and is essential in HVAC calculations.
8. A 45-degree offset in ductwork requires how many fittings?
A. 1
B. 2
C. 3
D. 4
