Practice Exam Questions And Correct

Sheet Metal Worker Journeyman Practice Exam Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• Which type of metal is most commonly used for ductwork in commercial

HVAC systems?

• Galvanized steel
• Copper
• Aluminum
• Stainless steel

Answer: Galvanized steel

Rationale: Galvanized steel is preferred for ductwork due to its corrosion

resistance, durability, and cost-effectiveness. 1 / 4

• What is the primary purpose of a soldering flux in sheet metal work?
• To clean the metal surface
• To remove oxidation and help the solder adhere
• To cool the joint
• To strengthen the metal

Answer: To remove oxidation and help the solder adhere

Rationale: Flux prevents oxidation during soldering, allowing proper

bonding between metals.

• When measuring and laying out sheet metal, which tool provides the

most accurate measurement?

• Ruler
• Steel tape measure
• String
• Caliper

Answer: Steel tape measure

Rationale: Steel tape measures provide accurate and durable

measurements, essential for precise layouts.

• Which type of joint is typically used to join two pieces of sheet metal at

a 90-degree angle?

• Lap joint
• Butt joint
• Corner seam
• Edge seam 2 / 4

Answer: Corner seam

Rationale: Corner seams are designed to connect two sheet metal sections

at right angles securely.

• The process of expanding metal using a hammer to fit a specific shape is

called:

• Rolling
• Welding
• Metal forming
• Punching

Answer: Metal forming

Rationale: Metal forming reshapes sheet metal without removing

material, often using hammers and dies.

• What is the recommended minimum thickness of ductwork for

residential HVAC systems?

• 16 gauge
• 20 gauge
• 22 gauge
• 24 gauge

Answer: 24 gauge

Rationale: 24 gauge galvanized steel is standard for residential ducts due

to ease of handling and adequate strength. 3 / 4

• Which type of hand seam is used to join two pieces of metal by folding

edges over each other?

• Butt seam
• Lock seam
• Lap seam
• Grooved seam

Answer: Lock seam

Rationale: Lock seams interlock folded edges to create a tight and durable

joint without welding.

8. In sheet metal work, the term “creep” refers to:

• Metal stretching over time under load
• Slow deformation of metal under constant stress
• Sudden cracking
• Tool misalignment

Answer: Slow deformation of metal under constant stress

Rationale: Creep is the gradual elongation of metal when subjected to

prolonged stress, important in design considerations.

• What is the function of a snips in sheet metal work?
• Drill holes
• Bend edges
• Cut sheet metal
• Flatten metal
• / 4