Apprentice Electrician Licensing Exam
Questions and Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A |
Instant Download Pdf
1. Which of the following is the primary purpose of a ground wire in
an electrical circuit?
A. To carry current to the load
B. To reduce voltage drop
C. To provide a path for electrical faults to prevent shock
D. To increase circuit efficiency
C. To provide a path for electrical faults to prevent shock
Rationale: The ground wire is a safety feature that provides a low-
resistance path to earth in case of a fault, protecting users from electric
shock and preventing damage to equipment.
2. What is the standard color for a grounded (neutral) conductor in
residential wiring?
, A. Black
B. White
C. Green
D. Red
B. White
Rationale: In North American residential wiring, the neutral conductor is
always identified by white insulation, while black or red is typically used
for hot wires.
3. According to the NEC, what is the minimum height for outlets
installed in residential kitchens?
A. 12 inches
B. 15 inches
C. 18 inches
D. 24 inches
B. 15 inches
Rationale: NEC guidelines require that kitchen countertop receptacles be
installed no less than 15 inches above the countertop to ensure
accessibility and code compliance.
4. What device automatically interrupts power in the event of an
overload or short circuit?
A. Transformer
, B. Circuit breaker
C. Contactor
D. Relay
B. Circuit breaker
Rationale: Circuit breakers are safety devices designed to interrupt
electrical flow when excessive current is detected, preventing
overheating and potential fire hazards.
5. Which of the following tools is primarily used to measure
electrical current?
A. Voltmeter
B. Ohmmeter
C. Ammeter
D. Megohmmeter
C. Ammeter
Rationale: An ammeter is specifically designed to measure the current in
amperes flowing through a circuit, either in series or via clamp-on
design.
6. When wiring a 120-volt, single-phase circuit, what is the typical
color code for the hot wire?
A. White
B. Black
, C. Green
D. Blue
B. Black
Rationale: The hot conductor in a single-phase 120-volt circuit is
typically black (sometimes red), while the neutral is white and the
ground is green or bare.
7. What is the maximum number of outlets allowed on a 15-ampere,
120-volt branch circuit in a dwelling unit according to the NEC?
A. 6
B. 8
C. 10
D. 12
C. 10
Rationale: The NEC recommends a maximum of 10 outlets for a 15-
ampere general-purpose branch circuit to prevent overloads.
8. Which of the following types of conduit is non-metallic and
resistant to corrosion?
A. EMT (Electrical Metallic Tubing)
B. RMC (Rigid Metal Conduit)
C. PVC (Polyvinyl Chloride)
D. IMC (Intermediate Metal Conduit)
Questions and Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A |
Instant Download Pdf
1. Which of the following is the primary purpose of a ground wire in
an electrical circuit?
A. To carry current to the load
B. To reduce voltage drop
C. To provide a path for electrical faults to prevent shock
D. To increase circuit efficiency
C. To provide a path for electrical faults to prevent shock
Rationale: The ground wire is a safety feature that provides a low-
resistance path to earth in case of a fault, protecting users from electric
shock and preventing damage to equipment.
2. What is the standard color for a grounded (neutral) conductor in
residential wiring?
, A. Black
B. White
C. Green
D. Red
B. White
Rationale: In North American residential wiring, the neutral conductor is
always identified by white insulation, while black or red is typically used
for hot wires.
3. According to the NEC, what is the minimum height for outlets
installed in residential kitchens?
A. 12 inches
B. 15 inches
C. 18 inches
D. 24 inches
B. 15 inches
Rationale: NEC guidelines require that kitchen countertop receptacles be
installed no less than 15 inches above the countertop to ensure
accessibility and code compliance.
4. What device automatically interrupts power in the event of an
overload or short circuit?
A. Transformer
, B. Circuit breaker
C. Contactor
D. Relay
B. Circuit breaker
Rationale: Circuit breakers are safety devices designed to interrupt
electrical flow when excessive current is detected, preventing
overheating and potential fire hazards.
5. Which of the following tools is primarily used to measure
electrical current?
A. Voltmeter
B. Ohmmeter
C. Ammeter
D. Megohmmeter
C. Ammeter
Rationale: An ammeter is specifically designed to measure the current in
amperes flowing through a circuit, either in series or via clamp-on
design.
6. When wiring a 120-volt, single-phase circuit, what is the typical
color code for the hot wire?
A. White
B. Black
, C. Green
D. Blue
B. Black
Rationale: The hot conductor in a single-phase 120-volt circuit is
typically black (sometimes red), while the neutral is white and the
ground is green or bare.
7. What is the maximum number of outlets allowed on a 15-ampere,
120-volt branch circuit in a dwelling unit according to the NEC?
A. 6
B. 8
C. 10
D. 12
C. 10
Rationale: The NEC recommends a maximum of 10 outlets for a 15-
ampere general-purpose branch circuit to prevent overloads.
8. Which of the following types of conduit is non-metallic and
resistant to corrosion?
A. EMT (Electrical Metallic Tubing)
B. RMC (Rigid Metal Conduit)
C. PVC (Polyvinyl Chloride)
D. IMC (Intermediate Metal Conduit)
