Nevada C-2 Electrical Contractor Exam
Practice Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. What is the primary purpose of the National Electrical Code (NEC)?
A. To provide design preferences for electricians
B. To establish minimum safety standards for electrical installations
C. To regulate electrical pricing
D. To certify electricians
Answer: B
The NEC sets minimum safety standards to protect people and
property from electrical hazards, not to dictate design preferences or
pricing.
2. What does ampacity refer to in electrical conductors?
A. Voltage rating
B. Current-carrying capacity
C. Resistance value
D. Insulation thickness
Answer: B
Ampacity is the maximum current a conductor can safely carry
without exceeding its temperature rating.
3. Which type of circuit breaker trips instantly during a short circuit?
A. Thermal breaker
B. Magnetic breaker
C. Hydraulic breaker
D. Time-delay breaker
Answer: B
, Magnetic breakers respond immediately to high fault currents such
as short circuits.
4. What is the standard voltage for a typical residential outlet in the
United States?
A. 60 volts
B. 120 volts
C. 240 volts
D. 480 volts
Answer: B
Most residential outlets operate at 120 volts for general-purpose use.
5. What color insulation is typically used for grounded (neutral)
conductors?
A. Black
B. Red
C. White or gray
D. Green
Answer: C
Neutral conductors are identified by white or gray insulation per NEC
standards.
6. What is the purpose of a grounding electrode system?
A. Increase voltage
B. Stabilize voltage to earth and dissipate fault current
C. Reduce current flow
D. Insulate circuits
Answer: B
Grounding systems connect electrical systems to earth to stabilize
voltage and safely dissipate faults.
7. Which tool is used to measure electrical resistance?
A. Ammeter
B. Voltmeter
C. Ohmmeter
D. Wattmeter
Answer: C
An ohmmeter measures resistance in ohms within a circuit.
, 8. What does GFCI stand for?
A. Ground Fault Circuit Interrupter
B. General Fault Circuit Indicator
C. Ground Frequency Current Indicator
D. General Flow Circuit Interrupter
Answer: A
GFCIs protect against electric shock by detecting ground faults and
interrupting the circuit.
9. Where are GFCI outlets typically required?
A. Bedrooms
B. Living rooms
C. Bathrooms and kitchens
D. Attics only
Answer: C
GFCIs are required in wet or damp locations like bathrooms and
kitchens to prevent shock hazards.
10. What is the function of a transformer?
A. Store electricity
B. Convert electrical energy to mechanical energy
C. Change voltage levels
D. Measure power
Answer: C
Transformers increase or decrease voltage levels using
electromagnetic induction.
11. Which conductor type is most commonly used for residential
wiring?
A. Aluminum
B. Copper
C. Steel
D. Brass
Answer: B
Copper is widely used due to its excellent conductivity and durability.
12. What is a short circuit?
A. A high-resistance connection
B. A direct connection between hot and neutral or ground
Practice Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. What is the primary purpose of the National Electrical Code (NEC)?
A. To provide design preferences for electricians
B. To establish minimum safety standards for electrical installations
C. To regulate electrical pricing
D. To certify electricians
Answer: B
The NEC sets minimum safety standards to protect people and
property from electrical hazards, not to dictate design preferences or
pricing.
2. What does ampacity refer to in electrical conductors?
A. Voltage rating
B. Current-carrying capacity
C. Resistance value
D. Insulation thickness
Answer: B
Ampacity is the maximum current a conductor can safely carry
without exceeding its temperature rating.
3. Which type of circuit breaker trips instantly during a short circuit?
A. Thermal breaker
B. Magnetic breaker
C. Hydraulic breaker
D. Time-delay breaker
Answer: B
, Magnetic breakers respond immediately to high fault currents such
as short circuits.
4. What is the standard voltage for a typical residential outlet in the
United States?
A. 60 volts
B. 120 volts
C. 240 volts
D. 480 volts
Answer: B
Most residential outlets operate at 120 volts for general-purpose use.
5. What color insulation is typically used for grounded (neutral)
conductors?
A. Black
B. Red
C. White or gray
D. Green
Answer: C
Neutral conductors are identified by white or gray insulation per NEC
standards.
6. What is the purpose of a grounding electrode system?
A. Increase voltage
B. Stabilize voltage to earth and dissipate fault current
C. Reduce current flow
D. Insulate circuits
Answer: B
Grounding systems connect electrical systems to earth to stabilize
voltage and safely dissipate faults.
7. Which tool is used to measure electrical resistance?
A. Ammeter
B. Voltmeter
C. Ohmmeter
D. Wattmeter
Answer: C
An ohmmeter measures resistance in ohms within a circuit.
, 8. What does GFCI stand for?
A. Ground Fault Circuit Interrupter
B. General Fault Circuit Indicator
C. Ground Frequency Current Indicator
D. General Flow Circuit Interrupter
Answer: A
GFCIs protect against electric shock by detecting ground faults and
interrupting the circuit.
9. Where are GFCI outlets typically required?
A. Bedrooms
B. Living rooms
C. Bathrooms and kitchens
D. Attics only
Answer: C
GFCIs are required in wet or damp locations like bathrooms and
kitchens to prevent shock hazards.
10. What is the function of a transformer?
A. Store electricity
B. Convert electrical energy to mechanical energy
C. Change voltage levels
D. Measure power
Answer: C
Transformers increase or decrease voltage levels using
electromagnetic induction.
11. Which conductor type is most commonly used for residential
wiring?
A. Aluminum
B. Copper
C. Steel
D. Brass
Answer: B
Copper is widely used due to its excellent conductivity and durability.
12. What is a short circuit?
A. A high-resistance connection
B. A direct connection between hot and neutral or ground
