JOURNEYMAN ELECTRICIAN LICENSE
EXAM AND SHEET-METAL WORKER
JOURNEYMAN EXAM PRACTICE
QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) PLUS RATIONALES
2026 Q&A | INSTANT DOWNLOAD PDF
1. Which type of wire is commonly used for branch circuits in
residential buildings?
A. THHN
B. NM-B
C. UF
D. MC
NM-B wire is standard for indoor residential branch circuits.
2. What is the primary purpose of a ground fault circuit interrupter
(GFCI)?
A. Protect equipment from overcurrent
B. Prevent arc faults
C. Protect people from electric shock
D. Reduce energy consumption
GFCI trips when it detects leakage current to prevent electric
shock.
3. Which tool is used to measure current without breaking the
circuit?
A. Voltmeter
, B. Ohmmeter
C. Clamp meter
D. Continuity tester
Clamp meters allow measurement of current without
disconnecting the circuit.
4. According to NEC, the minimum height for service conductors
above finished grade is:
A. 6 ft
B. 8 ft
C. 10 ft
D. 12 ft
NEC requires service conductors to maintain clearance of at least
12 ft above grade.
5. What metal is commonly used for ductwork in HVAC systems?
A. Aluminum
B. Galvanized steel
C. Copper
D. Stainless steel
Galvanized steel is durable, corrosion-resistant, and widely used
for ducts.
6. In sheet-metal work, the purpose of a brake is to:
A. Cut metal
B. Flatten surfaces
C. Bend metal
D. Drill holes
A brake allows precise bending of sheet metal.
7. The ampacity of a conductor is defined as:
A. Voltage drop per foot
B. Maximum current a conductor can safely carry
, C. Resistance of a wire
D. Conductor’s insulation type
Ampacity is the safe current-carrying capacity of a conductor.
8. What is the standard gauge of residential NM-B wiring for 20-amp
circuits?
A. 14 AWG
B. 12 AWG
C. 10 AWG
D. 8 AWG
12 AWG is rated for 20-amp circuits.
9. Which of the following tools is essential for duct seam sealing?
A. Hammer
B. Caulking gun
C. Drill
D. Vice
Sealants are applied using a caulking gun to prevent air leakage.
10. When installing metal ductwork, the minimum overlap for a
seam is:
A. 0.5 inch
B. 1 inch
C. 1.5 inch
D. 2 inches
Proper overlap ensures structural integrity and airtightness.
11. What is the function of a disconnect switch in electrical
installations?
A. Step down voltage
B. Isolate equipment for maintenance
C. Measure current
EXAM AND SHEET-METAL WORKER
JOURNEYMAN EXAM PRACTICE
QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) PLUS RATIONALES
2026 Q&A | INSTANT DOWNLOAD PDF
1. Which type of wire is commonly used for branch circuits in
residential buildings?
A. THHN
B. NM-B
C. UF
D. MC
NM-B wire is standard for indoor residential branch circuits.
2. What is the primary purpose of a ground fault circuit interrupter
(GFCI)?
A. Protect equipment from overcurrent
B. Prevent arc faults
C. Protect people from electric shock
D. Reduce energy consumption
GFCI trips when it detects leakage current to prevent electric
shock.
3. Which tool is used to measure current without breaking the
circuit?
A. Voltmeter
, B. Ohmmeter
C. Clamp meter
D. Continuity tester
Clamp meters allow measurement of current without
disconnecting the circuit.
4. According to NEC, the minimum height for service conductors
above finished grade is:
A. 6 ft
B. 8 ft
C. 10 ft
D. 12 ft
NEC requires service conductors to maintain clearance of at least
12 ft above grade.
5. What metal is commonly used for ductwork in HVAC systems?
A. Aluminum
B. Galvanized steel
C. Copper
D. Stainless steel
Galvanized steel is durable, corrosion-resistant, and widely used
for ducts.
6. In sheet-metal work, the purpose of a brake is to:
A. Cut metal
B. Flatten surfaces
C. Bend metal
D. Drill holes
A brake allows precise bending of sheet metal.
7. The ampacity of a conductor is defined as:
A. Voltage drop per foot
B. Maximum current a conductor can safely carry
, C. Resistance of a wire
D. Conductor’s insulation type
Ampacity is the safe current-carrying capacity of a conductor.
8. What is the standard gauge of residential NM-B wiring for 20-amp
circuits?
A. 14 AWG
B. 12 AWG
C. 10 AWG
D. 8 AWG
12 AWG is rated for 20-amp circuits.
9. Which of the following tools is essential for duct seam sealing?
A. Hammer
B. Caulking gun
C. Drill
D. Vice
Sealants are applied using a caulking gun to prevent air leakage.
10. When installing metal ductwork, the minimum overlap for a
seam is:
A. 0.5 inch
B. 1 inch
C. 1.5 inch
D. 2 inches
Proper overlap ensures structural integrity and airtightness.
11. What is the function of a disconnect switch in electrical
installations?
A. Step down voltage
B. Isolate equipment for maintenance
C. Measure current
