Alabama Electrical Contractor Licensing
Examination Master Electrician
Examination Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
1. A branch circuit supplying general lighting in a dwelling unit is typically
limited to:
A. 10 amps
B. 15 amps
C. 20 amps
D. 30 amps
Correct Answer: C. 20 amps
Rationale: A 20-amp branch circuit is the standard minimum capacity for
general lighting and receptacle circuits in dwelling units under typical electrical
code practice. It provides adequate capacity while maintaining safety and
preventing conductor overheating.
2. The primary purpose of grounding in an electrical system is to:
A. Increase voltage
B. Provide a return path for normal current
C. Stabilize voltage and provide a fault current path
D. Reduce conductor resistance
,Correct Answer: C. Stabilize voltage and provide a fault current path
Rationale: Grounding ensures that under fault conditions, excess current is safely
directed to earth, helping protective devices operate quickly while stabilizing
system voltage during normal operation.
3. The minimum burial depth for PVC conduit carrying 120V residential branch
circuits is generally:
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
Correct Answer: C. 18 inches
Rationale: Typical NEC guidelines require approximately 18 inches of cover for
PVC conduit in residential branch circuit installations to protect wiring from
physical damage and environmental exposure.
4. What device protects circuits from overloads and short circuits?
A. Transformer
B. Circuit breaker
C. Capacitor
D. Relay
Correct Answer: B. Circuit breaker
Rationale: Circuit breakers automatically interrupt current flow during overload
or short-circuit conditions, preventing conductor damage and fire hazards.
5. Ohm’s Law is expressed as:
A. P = IV
B. V = IR
, C. I = PR
D. R = VI
Correct Answer: B. V = IR
Rationale: Ohm’s Law defines the relationship between voltage, current, and
resistance, forming the basis for electrical circuit calculations.
6. The function of a transformer is to:
A. Convert AC to DC
B. Store electrical energy
C. Change voltage levels
D. Limit current flow
Correct Answer: C. Change voltage levels
Rationale: Transformers operate using electromagnetic induction to step voltage
up or down while maintaining frequency.
7. A GFCI primarily protects against:
A. Overvoltage
B. Ground faults and electric shock
C. Short circuits only
D. Lightning strikes
Correct Answer: B. Ground faults and electric shock
Rationale: Ground Fault Circuit Interrupters detect imbalance between hot and
neutral conductors, rapidly disconnecting power to prevent shock hazards.
8. The standard color for grounded (neutral) conductors is:
A. Red
B. Black
C. White or gray
D. Green
, Correct Answer: C. White or gray
Rationale: White or gray insulation is universally used to identify grounded
(neutral) conductors for safety and code compliance.
9. Conduit used in corrosive environments is most commonly:
A. EMT
B. Rigid metal conduit
C. PVC conduit
D. Flexible metal conduit
Correct Answer: C. PVC conduit
Rationale: PVC conduit resists corrosion and moisture, making it ideal for harsh
or underground environments.
10.The purpose of a fuse is to:
A. Regulate voltage
B. Store energy
C. Open a circuit during excessive current flow
D. Increase current flow
Correct Answer: C. Open a circuit during excessive current flow
Rationale: Fuses melt under excessive current conditions, providing overcurrent
protection by breaking the circuit.
11.Which instrument is used to measure current?
A. Voltmeter
B. Ohmmeter
C. Ammeter
D. Wattmeter
Examination Master Electrician
Examination Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A | Instant
Download Pdf
1. A branch circuit supplying general lighting in a dwelling unit is typically
limited to:
A. 10 amps
B. 15 amps
C. 20 amps
D. 30 amps
Correct Answer: C. 20 amps
Rationale: A 20-amp branch circuit is the standard minimum capacity for
general lighting and receptacle circuits in dwelling units under typical electrical
code practice. It provides adequate capacity while maintaining safety and
preventing conductor overheating.
2. The primary purpose of grounding in an electrical system is to:
A. Increase voltage
B. Provide a return path for normal current
C. Stabilize voltage and provide a fault current path
D. Reduce conductor resistance
,Correct Answer: C. Stabilize voltage and provide a fault current path
Rationale: Grounding ensures that under fault conditions, excess current is safely
directed to earth, helping protective devices operate quickly while stabilizing
system voltage during normal operation.
3. The minimum burial depth for PVC conduit carrying 120V residential branch
circuits is generally:
A. 6 inches
B. 12 inches
C. 18 inches
D. 24 inches
Correct Answer: C. 18 inches
Rationale: Typical NEC guidelines require approximately 18 inches of cover for
PVC conduit in residential branch circuit installations to protect wiring from
physical damage and environmental exposure.
4. What device protects circuits from overloads and short circuits?
A. Transformer
B. Circuit breaker
C. Capacitor
D. Relay
Correct Answer: B. Circuit breaker
Rationale: Circuit breakers automatically interrupt current flow during overload
or short-circuit conditions, preventing conductor damage and fire hazards.
5. Ohm’s Law is expressed as:
A. P = IV
B. V = IR
, C. I = PR
D. R = VI
Correct Answer: B. V = IR
Rationale: Ohm’s Law defines the relationship between voltage, current, and
resistance, forming the basis for electrical circuit calculations.
6. The function of a transformer is to:
A. Convert AC to DC
B. Store electrical energy
C. Change voltage levels
D. Limit current flow
Correct Answer: C. Change voltage levels
Rationale: Transformers operate using electromagnetic induction to step voltage
up or down while maintaining frequency.
7. A GFCI primarily protects against:
A. Overvoltage
B. Ground faults and electric shock
C. Short circuits only
D. Lightning strikes
Correct Answer: B. Ground faults and electric shock
Rationale: Ground Fault Circuit Interrupters detect imbalance between hot and
neutral conductors, rapidly disconnecting power to prevent shock hazards.
8. The standard color for grounded (neutral) conductors is:
A. Red
B. Black
C. White or gray
D. Green
, Correct Answer: C. White or gray
Rationale: White or gray insulation is universally used to identify grounded
(neutral) conductors for safety and code compliance.
9. Conduit used in corrosive environments is most commonly:
A. EMT
B. Rigid metal conduit
C. PVC conduit
D. Flexible metal conduit
Correct Answer: C. PVC conduit
Rationale: PVC conduit resists corrosion and moisture, making it ideal for harsh
or underground environments.
10.The purpose of a fuse is to:
A. Regulate voltage
B. Store energy
C. Open a circuit during excessive current flow
D. Increase current flow
Correct Answer: C. Open a circuit during excessive current flow
Rationale: Fuses melt under excessive current conditions, providing overcurrent
protection by breaking the circuit.
11.Which instrument is used to measure current?
A. Voltmeter
B. Ohmmeter
C. Ammeter
D. Wattmeter
