Electrical Contractor Licensing Exam
Question And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A
Instant Download Pdf
1. What is the primary purpose of grounding an electrical system?
A. To increase voltage
B. To stabilize current
C. To provide a safe path for fault current
D. To reduce resistance
Rationale: Grounding safely directs fault current to earth, reducing shock
and fire hazards.
2. Which device protects against overloads and short circuits?
A. Receptacle
B. Junction box
C. Circuit breaker
D. Transformer
Rationale: A circuit breaker interrupts current flow when overload or
short-circuit conditions occur.
3. What is the standard color for a grounded (neutral) conductor?
A. Red
B. Green
C. White
D. Blue
Rationale: The NEC requires white or gray insulation for grounded
(neutral) conductors.
,4. Which wire color is used for equipment grounding conductors?
A. Black
B. Green
C. White
D. Blue
Rationale: Green or bare conductors are used for equipment grounding.
5. What unit is used to measure electrical resistance?
A. Watt
B. Volt
C. Ampere
D. Ohm
Rationale: Electrical resistance is measured in ohms.
6. Which component reduces voltage in a power system?
A. Generator
B. Transformer
C. Circuit breaker
D. Motor
Rationale: A transformer can step voltage up or down by electromagnetic
induction.
7. What type of current is supplied to most residential homes?
A. Direct current
B. Alternating current
C. Pulsating current
D. Static current
Rationale: Homes are supplied with alternating current (AC).
8. What does GFCI stand for?
A. Ground Fault Circuit Indicator
B. Grounded Fault Current Interrupter
C. Ground Fault Circuit Interrupter
D. Grounded Function Control Interface
Rationale: GFCI devices interrupt circuits when ground faults are detected.
, 9. What is the minimum burial depth for residential underground wiring
(direct burial cable) in most NEC applications?
A. 6 inches
B. 12 inches
C. 24 inches
D. 36 inches
Rationale: NEC commonly requires 24 inches for direct burial cable.
10.Which type of conduit is non-metallic and flexible?
A. EMT
B. RMC
C. FMC
D. PVC
Rationale: PVC conduit is non-metallic and corrosion-resistant.
11.What device measures electrical current?
A. Voltmeter
B. Ohmmeter
C. Ammeter
D. Wattmeter
Rationale: An ammeter measures the flow of current in amperes.
12.What does NEC stand for?
A. National Electrical Council
B. National Electrical Code
C. National Energy Commission
D. National Electric Certification
Rationale: NEC stands for National Electrical Code.
13.What is the color code for ungrounded (hot) conductors?
A. Green
B. White
C. Black
D. Gray
Rationale: Black is typically used for ungrounded (hot) conductors.
Question And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A
Instant Download Pdf
1. What is the primary purpose of grounding an electrical system?
A. To increase voltage
B. To stabilize current
C. To provide a safe path for fault current
D. To reduce resistance
Rationale: Grounding safely directs fault current to earth, reducing shock
and fire hazards.
2. Which device protects against overloads and short circuits?
A. Receptacle
B. Junction box
C. Circuit breaker
D. Transformer
Rationale: A circuit breaker interrupts current flow when overload or
short-circuit conditions occur.
3. What is the standard color for a grounded (neutral) conductor?
A. Red
B. Green
C. White
D. Blue
Rationale: The NEC requires white or gray insulation for grounded
(neutral) conductors.
,4. Which wire color is used for equipment grounding conductors?
A. Black
B. Green
C. White
D. Blue
Rationale: Green or bare conductors are used for equipment grounding.
5. What unit is used to measure electrical resistance?
A. Watt
B. Volt
C. Ampere
D. Ohm
Rationale: Electrical resistance is measured in ohms.
6. Which component reduces voltage in a power system?
A. Generator
B. Transformer
C. Circuit breaker
D. Motor
Rationale: A transformer can step voltage up or down by electromagnetic
induction.
7. What type of current is supplied to most residential homes?
A. Direct current
B. Alternating current
C. Pulsating current
D. Static current
Rationale: Homes are supplied with alternating current (AC).
8. What does GFCI stand for?
A. Ground Fault Circuit Indicator
B. Grounded Fault Current Interrupter
C. Ground Fault Circuit Interrupter
D. Grounded Function Control Interface
Rationale: GFCI devices interrupt circuits when ground faults are detected.
, 9. What is the minimum burial depth for residential underground wiring
(direct burial cable) in most NEC applications?
A. 6 inches
B. 12 inches
C. 24 inches
D. 36 inches
Rationale: NEC commonly requires 24 inches for direct burial cable.
10.Which type of conduit is non-metallic and flexible?
A. EMT
B. RMC
C. FMC
D. PVC
Rationale: PVC conduit is non-metallic and corrosion-resistant.
11.What device measures electrical current?
A. Voltmeter
B. Ohmmeter
C. Ammeter
D. Wattmeter
Rationale: An ammeter measures the flow of current in amperes.
12.What does NEC stand for?
A. National Electrical Council
B. National Electrical Code
C. National Energy Commission
D. National Electric Certification
Rationale: NEC stands for National Electrical Code.
13.What is the color code for ungrounded (hot) conductors?
A. Green
B. White
C. Black
D. Gray
Rationale: Black is typically used for ungrounded (hot) conductors.
