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Nevada C-2 Electrical Contractor Exam
Practice Test Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A Instant Download
Pdf
___________________________________________________________________
1. What is the primary purpose of a grounding electrode system?
A. To increase voltage
B. To reduce current flow
C. To stabilize voltage to earth during faults
D. To prevent conductor overheating
Rationale: A grounding electrode system helps stabilize system voltage and
safely dissipates fault currents into the earth.
2. Which NEC article covers grounding and bonding?
A. Article 110
B. Article 220
C. Article 250
D. Article 250
Rationale: NEC Article 250 specifically addresses grounding and bonding
requirements.
, 3. What device protects against overloads and short circuits?
A. Transformer
B. Relay
C. Circuit breaker
D. Capacitor
Rationale: Circuit breakers are designed to interrupt current during overloads
and short circuits.
4. What color insulation is typically used for grounded conductors?
A. Green
B. Red
C. Black
D. White or gray
Rationale: NEC requires grounded conductors to be identified by white or gray
insulation.
5. What is the minimum working clearance in front of a 480V panelboard
under normal conditions?
A. 2 feet
B. 3 feet
C. 4 feet
D. 5 feet
Rationale: NEC 110.26 generally requires at least 3 feet of working clearance for
equipment operating at 480V.
6. Which instrument measures electrical resistance?
A. Ammeter
B. Voltmeter
C. Wattmeter
D. Ohmmeter
Rationale: An ohmmeter is specifically designed to measure resistance.
, 7. What does GFCI stand for?
A. Ground Fault Current Interrupter
B. Ground Feed Circuit Isolator
C. Ground Fault Circuit Interrupter
D. Ground Feed Current Interrupter
Rationale: GFCI devices protect people from shock by interrupting current during
ground faults.
8. What is the typical frequency of AC power in the United States?
A. 50 Hz
B. 60 Hz
C. 120 Hz
D. 240 Hz
Rationale: Standard AC power frequency in the U.S. is 60 hertz.
9. Which conductor size has the larger diameter?
A. 12 AWG
B. 10 AWG
C. 8 AWG
D. 14 AWG
Rationale: As AWG numbers decrease, conductor diameter increases.
10.What type of fire extinguisher is used for energized electrical fires?
A. Class A
B. Class B
C. Class C
D. Class D
Rationale: Class C extinguishers are intended for energized electrical equipment
fires.
11.What law states that voltage equals current times resistance?
Nevada C-2 Electrical Contractor Exam
Practice Test Questions And Correct
Answers (Verified Answers) Plus
Rationales 2026 Q&A Instant Download
___________________________________________________________________
1. What is the primary purpose of a grounding electrode system?
A. To increase voltage
B. To reduce current flow
C. To stabilize voltage to earth during faults
D. To prevent conductor overheating
Rationale: A grounding electrode system helps stabilize system voltage and
safely dissipates fault currents into the earth.
2. Which NEC article covers grounding and bonding?
A. Article 110
B. Article 220
C. Article 250
D. Article 250
Rationale: NEC Article 250 specifically addresses grounding and bonding
requirements.
, 3. What device protects against overloads and short circuits?
A. Transformer
B. Relay
C. Circuit breaker
D. Capacitor
Rationale: Circuit breakers are designed to interrupt current during overloads
and short circuits.
4. What color insulation is typically used for grounded conductors?
A. Green
B. Red
C. Black
D. White or gray
Rationale: NEC requires grounded conductors to be identified by white or gray
insulation.
5. What is the minimum working clearance in front of a 480V panelboard
under normal conditions?
A. 2 feet
B. 3 feet
C. 4 feet
D. 5 feet
Rationale: NEC 110.26 generally requires at least 3 feet of working clearance for
equipment operating at 480V.
6. Which instrument measures electrical resistance?
A. Ammeter
B. Voltmeter
C. Wattmeter
D. Ohmmeter
Rationale: An ohmmeter is specifically designed to measure resistance.
, 7. What does GFCI stand for?
A. Ground Fault Current Interrupter
B. Ground Feed Circuit Isolator
C. Ground Fault Circuit Interrupter
D. Ground Feed Current Interrupter
Rationale: GFCI devices protect people from shock by interrupting current during
ground faults.
8. What is the typical frequency of AC power in the United States?
A. 50 Hz
B. 60 Hz
C. 120 Hz
D. 240 Hz
Rationale: Standard AC power frequency in the U.S. is 60 hertz.
9. Which conductor size has the larger diameter?
A. 12 AWG
B. 10 AWG
C. 8 AWG
D. 14 AWG
Rationale: As AWG numbers decrease, conductor diameter increases.
10.What type of fire extinguisher is used for energized electrical fires?
A. Class A
B. Class B
C. Class C
D. Class D
Rationale: Class C extinguishers are intended for energized electrical equipment
fires.
11.What law states that voltage equals current times resistance?
