Alaska Journeyman Electrician Exam Verified
Questions, Correct Answers, and Detailed
Explanations for Science Students||Already Graded
A+
1. What is the maximum allowable voltage drop for branch circuits in
a dwelling?
A. 2%
B. 3%
C. 5%
D. 10%
Answer: B. 3%
Rationale: NEC recommends a maximum voltage drop of 3% for
branch circuits to ensure efficient operation of electrical equipment.
2. Which conductor material is most commonly used for residential
wiring?
A. Aluminum
B. Copper
C. Silver
D. Iron
Answer: B. Copper
Rationale: Copper is preferred due to its high conductivity, durability,
and ease of installation.
3. What is the minimum depth a 120V residential circuit must be
buried in soil without a raceway?
A. 12 inches
B. 18 inches
C. 24 inches
D. 6 inches
Answer: A. 12 inches
Rationale: NEC Table 300.5 specifies 12 inches minimum for
nonmetallic-sheathed cable (NM) in direct burial.
,4. What is the NEC standard for ground-fault protection in dwelling
unit receptacles?
A. AFCI
B. GFCI
C. ELCI
D. TFCI
Answer: B. GFCI
Rationale: Ground-Fault Circuit Interrupters (GFCIs) are required in
areas like kitchens, bathrooms, and outdoors to protect against
shock.
5. Which type of conduit is permitted for underground installation
without additional protection?
A. EMT
B. RMC
C. PVC
D. FMC
Answer: C. PVC
Rationale: PVC conduit is rated for direct burial and provides
corrosion resistance in underground installations.
6. What is the primary purpose of an AFCI?
A. Prevent overvoltage
B. Protect against ground faults
C. Prevent arcing faults
D. Limit current
Answer: C. Prevent arcing faults
Rationale: Arc-Fault Circuit Interrupters (AFCIs) protect circuits from
fires caused by arcing.
7. In a 120/240V single-phase system, what is the voltage between
the two hot conductors?
A. 120V
B. 208V
C. 240V
, D. 480V
Answer: C. 240V
Rationale: The two hot conductors are 180° out of phase, producing
240V between them.
8. Which NEC article covers low-voltage landscape lighting?
A. Article 300
B. Article 411
C. Article 500
D. Article 725
Answer: B. Article 411
Rationale: NEC Article 411 addresses low-voltage lighting systems,
including installation requirements and protection.
9. What is the minimum rating of a feeder breaker supplying a 30A
branch circuit?
A. 15A
B. 20A
C. 30A
D. 40A
Answer: C. 30A
Rationale: A feeder must be rated equal to or greater than the branch
circuit it supplies to prevent overload.
10. Which conductor color is typically used for a grounded (neutral)
wire?
A. Black
B. White
C. Red
D. Green
Answer: B. White
Rationale: NEC standardizes white (or gray) as the color for neutral
conductors.
Questions, Correct Answers, and Detailed
Explanations for Science Students||Already Graded
A+
1. What is the maximum allowable voltage drop for branch circuits in
a dwelling?
A. 2%
B. 3%
C. 5%
D. 10%
Answer: B. 3%
Rationale: NEC recommends a maximum voltage drop of 3% for
branch circuits to ensure efficient operation of electrical equipment.
2. Which conductor material is most commonly used for residential
wiring?
A. Aluminum
B. Copper
C. Silver
D. Iron
Answer: B. Copper
Rationale: Copper is preferred due to its high conductivity, durability,
and ease of installation.
3. What is the minimum depth a 120V residential circuit must be
buried in soil without a raceway?
A. 12 inches
B. 18 inches
C. 24 inches
D. 6 inches
Answer: A. 12 inches
Rationale: NEC Table 300.5 specifies 12 inches minimum for
nonmetallic-sheathed cable (NM) in direct burial.
,4. What is the NEC standard for ground-fault protection in dwelling
unit receptacles?
A. AFCI
B. GFCI
C. ELCI
D. TFCI
Answer: B. GFCI
Rationale: Ground-Fault Circuit Interrupters (GFCIs) are required in
areas like kitchens, bathrooms, and outdoors to protect against
shock.
5. Which type of conduit is permitted for underground installation
without additional protection?
A. EMT
B. RMC
C. PVC
D. FMC
Answer: C. PVC
Rationale: PVC conduit is rated for direct burial and provides
corrosion resistance in underground installations.
6. What is the primary purpose of an AFCI?
A. Prevent overvoltage
B. Protect against ground faults
C. Prevent arcing faults
D. Limit current
Answer: C. Prevent arcing faults
Rationale: Arc-Fault Circuit Interrupters (AFCIs) protect circuits from
fires caused by arcing.
7. In a 120/240V single-phase system, what is the voltage between
the two hot conductors?
A. 120V
B. 208V
C. 240V
, D. 480V
Answer: C. 240V
Rationale: The two hot conductors are 180° out of phase, producing
240V between them.
8. Which NEC article covers low-voltage landscape lighting?
A. Article 300
B. Article 411
C. Article 500
D. Article 725
Answer: B. Article 411
Rationale: NEC Article 411 addresses low-voltage lighting systems,
including installation requirements and protection.
9. What is the minimum rating of a feeder breaker supplying a 30A
branch circuit?
A. 15A
B. 20A
C. 30A
D. 40A
Answer: C. 30A
Rationale: A feeder must be rated equal to or greater than the branch
circuit it supplies to prevent overload.
10. Which conductor color is typically used for a grounded (neutral)
wire?
A. Black
B. White
C. Red
D. Green
Answer: B. White
Rationale: NEC standardizes white (or gray) as the color for neutral
conductors.
