Exam Practice Questions And Correct

Master Sheet Metal Worker License Exam Practice 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?

• Copper
• Aluminum
• Galvanized steel
• Stainless steel

Rationale: Galvanized steel is preferred for ductwork due to its

corrosion resistance, cost-effectiveness, and durability.

• What is the primary purpose of a shear in sheet metal work?
• To fold metal 1 / 4

• To cut metal
• To drill holes
• To weld pieces

Rationale: A shear is designed to make straight cuts in sheet metal

efficiently.

• What is the typical minimum clearance for an expansion joint in

ductwork?

• 1/4 inch
• 1/2 inch
• 3/4 inch
• 1 inch

Rationale: A 3/4 inch clearance is generally recommended to allow

for thermal expansion and contraction.

• Which type of solder is commonly used for HVAC piping?
• 40/60
• 50/50
• 60/40
• 70/30

Rationale: 50/50 solder (tin/lead) provides good adhesion and

melting characteristics for HVAC copper piping.

• What is the main advantage of using stainless steel over galvanized

steel?

• Lower cost 2 / 4

• Easier to cut
• Higher corrosion resistance
• Lighter weight

Rationale: Stainless steel offers superior corrosion resistance, which

is ideal in harsh environments.

• In sheet metal fabrication, what is a “flange”?
• A cutting tool
• A type of screw
• An edge bent at a right angle
• A welding technique

Rationale: A flange is the bent edge of sheet metal used to reinforce,

attach, or connect parts.

• Which gauge indicates the thickest sheet metal?
• 22
• 18
• 12
• 24

Rationale: Lower gauge numbers correspond to thicker metal, so 12

gauge is thicker than 22 or 24.

• What is the typical use of a brake in sheet metal work?
• To bend metal at specific angles
• To cut metal sheets
• To drill holes 3 / 4

• To smooth edges

Rationale: A sheet metal brake is used to make precise bends in

metal sheets.

• Which type of welding is most common for sheet metal?
• Arc welding
• Stick welding
• TIG/MIG welding
• Flux welding

Rationale: TIG and MIG welding allow for precise, clean welds

suitable for thin sheet metal.

• Which safety equipment is essential when using a plasma

cutter?

• Earplugs only
• Welding helmet, gloves, and protective clothing
• Respirator only
• Safety shoes only

Rationale: Plasma cutting emits intense light and heat, requiring full

protective gear to prevent burns and eye damage.

• What is the main cause of oil canning in metal panels?
• Rusting
• Excessive heat
• Stress and improper fastening
• Thick gauge
• / 4