Massachusetts Sheet Metal Worker
Journeyman Exam Questions and Correct
Answers (Verified Answers) Plus Rationales
2026 Q&A | Instant Download Pdf
1. Which type of metal is most commonly used for HVAC ductwork?
A) Copper
B) Galvanized steel
C) Aluminum
D) Stainless steel
Rationale: Galvanized steel is preferred for HVAC ductwork due
to its durability, corrosion resistance, and cost-effectiveness.
Copper is typically used for piping, not ductwork.
2. When installing a duct system, the primary purpose of a plenum is
to:
A) Reduce sound transmission
B) Distribute air evenly
C) Filter contaminants
D) Increase air velocity
, Rationale: A plenum serves as a central distribution point that
evenly delivers conditioned air to the duct branches.
3. Which of the following is a common method for joining sheet
metal ducts?
A) Welding only
B) Lockseam or Pittsburgh seam
C) Glue and nails
D) Mortar
Rationale: Lockseam and Pittsburgh seams provide strong,
airtight connections commonly used in sheet metal ductwork.
4. What is the standard gauge for commercial galvanized steel
ductwork?
A) 14–16 gauge
B) 18–24 gauge
C) 26–28 gauge
D) 8–10 gauge
Rationale: Most commercial ductwork uses 18–24 gauge steel,
balancing strength and ease of fabrication.
5. Which tool is primarily used for cutting sheet metal?
A) Hacksaw
B) Drill press
, C) Snips
D) Chisel
Rationale: Snips allow precise cuts in sheet metal without
deforming the material, making them the standard cutting tool.
6. When fabricating a round duct from flat sheet metal, what is the
first step?
A) Installing the plenum
B) Developing the flat pattern
C) Welding the seams
D) Attaching insulation
Rationale: Developing the flat pattern ensures the metal is cut
and bent to the proper dimensions before assembly.
7. The minimum slope required for a drain pan under an HVAC unit
is:
A) ¼ inch per foot
B) ½ inch per foot
C) 1/8 inch per foot
D) 1 inch per foot
Rationale: A minimum slope of 1/8 inch per foot ensures proper
drainage and prevents water accumulation in the pan.
, 8. In sheet metal terminology, a “Pittsburgh seam” is used to:
A) Secure insulation
B) Attach flanges
C) Join two pieces of duct
D) Reduce noise
Rationale: The Pittsburgh seam is a mechanically interlocking
seam used to connect duct sections without welding.
9. Which type of insulation is most commonly used on ductwork to
reduce thermal loss?
A) Fiberglass
B) Polyurethane
C) Mineral wool
D) Foil-faced fiberglass
Rationale: Foil-faced fiberglass is common for duct insulation
because it provides thermal resistance and acts as a vapor
barrier.
10. When measuring airflow through a duct, the unit of
measurement is:
A) PSI
B) CFM (Cubic Feet per Minute)
C) RPM
Journeyman Exam Questions and Correct
Answers (Verified Answers) Plus Rationales
2026 Q&A | Instant Download Pdf
1. Which type of metal is most commonly used for HVAC ductwork?
A) Copper
B) Galvanized steel
C) Aluminum
D) Stainless steel
Rationale: Galvanized steel is preferred for HVAC ductwork due
to its durability, corrosion resistance, and cost-effectiveness.
Copper is typically used for piping, not ductwork.
2. When installing a duct system, the primary purpose of a plenum is
to:
A) Reduce sound transmission
B) Distribute air evenly
C) Filter contaminants
D) Increase air velocity
, Rationale: A plenum serves as a central distribution point that
evenly delivers conditioned air to the duct branches.
3. Which of the following is a common method for joining sheet
metal ducts?
A) Welding only
B) Lockseam or Pittsburgh seam
C) Glue and nails
D) Mortar
Rationale: Lockseam and Pittsburgh seams provide strong,
airtight connections commonly used in sheet metal ductwork.
4. What is the standard gauge for commercial galvanized steel
ductwork?
A) 14–16 gauge
B) 18–24 gauge
C) 26–28 gauge
D) 8–10 gauge
Rationale: Most commercial ductwork uses 18–24 gauge steel,
balancing strength and ease of fabrication.
5. Which tool is primarily used for cutting sheet metal?
A) Hacksaw
B) Drill press
, C) Snips
D) Chisel
Rationale: Snips allow precise cuts in sheet metal without
deforming the material, making them the standard cutting tool.
6. When fabricating a round duct from flat sheet metal, what is the
first step?
A) Installing the plenum
B) Developing the flat pattern
C) Welding the seams
D) Attaching insulation
Rationale: Developing the flat pattern ensures the metal is cut
and bent to the proper dimensions before assembly.
7. The minimum slope required for a drain pan under an HVAC unit
is:
A) ¼ inch per foot
B) ½ inch per foot
C) 1/8 inch per foot
D) 1 inch per foot
Rationale: A minimum slope of 1/8 inch per foot ensures proper
drainage and prevents water accumulation in the pan.
, 8. In sheet metal terminology, a “Pittsburgh seam” is used to:
A) Secure insulation
B) Attach flanges
C) Join two pieces of duct
D) Reduce noise
Rationale: The Pittsburgh seam is a mechanically interlocking
seam used to connect duct sections without welding.
9. Which type of insulation is most commonly used on ductwork to
reduce thermal loss?
A) Fiberglass
B) Polyurethane
C) Mineral wool
D) Foil-faced fiberglass
Rationale: Foil-faced fiberglass is common for duct insulation
because it provides thermal resistance and acts as a vapor
barrier.
10. When measuring airflow through a duct, the unit of
measurement is:
A) PSI
B) CFM (Cubic Feet per Minute)
C) RPM
