AR SH Sheet Metal Contractor Exam
Questions And Correct Answers
(Verified Answers) Plus Rationale2026
Q&A| Instant Download Pdf
1. Which of the following metals is most commonly used in ductwork?
A. Aluminum
B. Copper
C. Galvanized steel
D. Brass
Galvanized steel is widely used in ductwork due to its durability,
corrosion resistance, and cost-effectiveness.
2. What is the primary purpose of a sheet metal brake?
A. Cutting metal sheets
B. Bending metal sheets accurately
C. Welding metal pieces
D. Polishing metal surfaces
A sheet metal brake is designed to bend and shape sheet metal
precisely without damaging it.
3. What type of joint is commonly used in round ductwork?
A. Butt joint
B. Corner joint
C. Lockseam joint
D. Welded joint
Lockseam joints provide a secure, leak-resistant connection in round
ducts.
4. What is the recommended gauge range for residential ductwork?
A. 12–14 gauge
B. 24–30 gauge
, C. 32–36 gauge
D. 8–10 gauge
Residential ducts typically use thinner gauges (24–30) for ease of
installation while maintaining sufficient strength.
5. Which tool is used to cut circular holes in sheet metal?
A. Tin snips
B. Shears
C. Hole saw or knockout punch
D. Grinder
Hole saws or knockout punches allow precise circular cuts for vents,
outlets, and fittings.
6. What is the standard slope recommended for sheet metal roof flashing
to prevent water penetration?
A. 1/8 inch per foot
B. 1/2 inch per foot
C. 1/4 inch per foot
D. 1 inch per foot
A 1/4 inch per foot slope ensures proper drainage and minimizes
water infiltration.
7. When installing duct insulation, what material is commonly used?
A. Fiberglass
B. Foil-faced fiberglass
C. Polystyrene
D. Rubber
Foil-faced fiberglass provides thermal insulation and a vapor barrier
for ducts.
8. Which type of metal is most corrosion-resistant for outdoor use?
A. Galvanized steel
B. Aluminum
C. Mild steel
D. Copper
Aluminum resists rust and corrosion, making it ideal for outdoor
sheet metal applications.
9. What is the minimum lap required for a typical lockseam joint in round
ducts?
A. 1/4 inch
B. 1/2 inch
, C. 3/4 inch
D. 1 inch
A 3/4 inch lap ensures structural integrity and reduces air leakage in
round ducts.
10. Which of the following is a standard safety practice when cutting
sheet metal?
A. Wearing sandals
B. Using wet hands
C. Wearing gloves and eye protection
D. Cutting with bare hands
Protective gloves and eye protection prevent cuts and injuries from
sharp edges and flying debris.
11. What is the common width of commercial sheet metal coils?
A. 12 inches
B. 18 inches
C. 24 inches
D. 36 inches
24-inch coils are standard for many commercial sheet metal
applications.
12. Which sheet metal fabrication process involves heating the metal
to make it pliable?
A. Rolling
B. Annealing
C. Stamping
D. Bending
Annealing softens metal by heating and cooling it, making it easier to
form without cracking.
13. What is the primary purpose of flashing in sheet metal roofing?
A. Decoration
B. Waterproofing joints and roof penetrations
C. Structural support
D. Insulation
Flashing directs water away from joints and roof penetrations to
prevent leaks.
14. When joining two pieces of sheet metal with a rivet, what is
important to ensure?
A. The rivet is loose
Questions And Correct Answers
(Verified Answers) Plus Rationale2026
Q&A| Instant Download Pdf
1. Which of the following metals is most commonly used in ductwork?
A. Aluminum
B. Copper
C. Galvanized steel
D. Brass
Galvanized steel is widely used in ductwork due to its durability,
corrosion resistance, and cost-effectiveness.
2. What is the primary purpose of a sheet metal brake?
A. Cutting metal sheets
B. Bending metal sheets accurately
C. Welding metal pieces
D. Polishing metal surfaces
A sheet metal brake is designed to bend and shape sheet metal
precisely without damaging it.
3. What type of joint is commonly used in round ductwork?
A. Butt joint
B. Corner joint
C. Lockseam joint
D. Welded joint
Lockseam joints provide a secure, leak-resistant connection in round
ducts.
4. What is the recommended gauge range for residential ductwork?
A. 12–14 gauge
B. 24–30 gauge
, C. 32–36 gauge
D. 8–10 gauge
Residential ducts typically use thinner gauges (24–30) for ease of
installation while maintaining sufficient strength.
5. Which tool is used to cut circular holes in sheet metal?
A. Tin snips
B. Shears
C. Hole saw or knockout punch
D. Grinder
Hole saws or knockout punches allow precise circular cuts for vents,
outlets, and fittings.
6. What is the standard slope recommended for sheet metal roof flashing
to prevent water penetration?
A. 1/8 inch per foot
B. 1/2 inch per foot
C. 1/4 inch per foot
D. 1 inch per foot
A 1/4 inch per foot slope ensures proper drainage and minimizes
water infiltration.
7. When installing duct insulation, what material is commonly used?
A. Fiberglass
B. Foil-faced fiberglass
C. Polystyrene
D. Rubber
Foil-faced fiberglass provides thermal insulation and a vapor barrier
for ducts.
8. Which type of metal is most corrosion-resistant for outdoor use?
A. Galvanized steel
B. Aluminum
C. Mild steel
D. Copper
Aluminum resists rust and corrosion, making it ideal for outdoor
sheet metal applications.
9. What is the minimum lap required for a typical lockseam joint in round
ducts?
A. 1/4 inch
B. 1/2 inch
, C. 3/4 inch
D. 1 inch
A 3/4 inch lap ensures structural integrity and reduces air leakage in
round ducts.
10. Which of the following is a standard safety practice when cutting
sheet metal?
A. Wearing sandals
B. Using wet hands
C. Wearing gloves and eye protection
D. Cutting with bare hands
Protective gloves and eye protection prevent cuts and injuries from
sharp edges and flying debris.
11. What is the common width of commercial sheet metal coils?
A. 12 inches
B. 18 inches
C. 24 inches
D. 36 inches
24-inch coils are standard for many commercial sheet metal
applications.
12. Which sheet metal fabrication process involves heating the metal
to make it pliable?
A. Rolling
B. Annealing
C. Stamping
D. Bending
Annealing softens metal by heating and cooling it, making it easier to
form without cracking.
13. What is the primary purpose of flashing in sheet metal roofing?
A. Decoration
B. Waterproofing joints and roof penetrations
C. Structural support
D. Insulation
Flashing directs water away from joints and roof penetrations to
prevent leaks.
14. When joining two pieces of sheet metal with a rivet, what is
important to ensure?
A. The rivet is loose
