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NASCLA Master/Unlimited Electrical Contractor
Exam | Questions And Answers {With Verified
Answers } Rated A | Qs & Ans 2026 | Digital
Download Pdf
1. What is the primary purpose of the National Electrical Code (NEC)?
A. Increase contractor profits
B. Regulate utility billing
C. Provide minimum safety standards for electrical installations
D. Replace state licensing laws
Rationale: The NEC establishes safety requirements to protect people and
property from electrical hazards.
2. Which organization publishes the NEC?
A. OSHA
B. IEEE
C. National Fire Protection Association (NFPA)
D. NASCLA
Rationale: The NFPA is responsible for publishing and updating the NEC.
3. What does “grounding” primarily protect against?
,©
A. Power outages
B. High utility bills
C. Electric shock and fault currents
D. Overbilling
Rationale: Grounding provides a safe path for fault current to reduce
shock hazards.
4. What is the purpose of a circuit breaker?
A. Increase voltage
B. Store electricity
C. Automatically disconnect a circuit during overload or fault
D. Reduce wire size
Rationale: Circuit breakers protect circuits from overcurrent conditions.
5. What does Ohm’s Law state?
A. P = VI
B. I = P/R
C. V = I × R
D. R = V × P
Rationale:
V=IRV = I RV=IR
VsV_sVs
,©
V
RRR
Ω\OmegaΩ
I=VsR=12.0 V6.0 Ω=2.00 AI = \frac{V_s}{R} =
\frac{12.0\,\mathrm{V}}{6.0\,\Omega} = 2.00\,\mathrm{A}I=RVs=6.0Ω12.0V
=2.00A
Vs = 12.0 V+-R = 6.0 ΩI = 2.00 A
Ohm’s Law defines the relationship between voltage, current, and resistance.
6. What unit measures electrical current?
A. Volt
B. Watt
C. Ampere (Amp)
D. Ohm
Rationale: Amperes measure the flow of electric charge.
7. What is the purpose of a GFCI?
A. Increase voltage
B. Store power
C. Protect against ground faults and shock hazards
D. Improve lighting efficiency
, ©
Rationale: GFCIs detect imbalance in current flow and shut off power
quickly.
8. What does a conduit primarily do?
A. Store electricity
B. Increase current
C. Protect and route electrical wiring
D. Generate power
Rationale: Conduit physically protects electrical conductors.
9. What is voltage?
A. Resistance to flow
B. Power usage
C. Electrical potential difference
D. Wire thickness
Rationale: Voltage is the force that pushes electric current.
10. What is the purpose of a transformer?
A. Store electricity
B. Break circuits
C. Increase or decrease voltage levels
D. Measure resistance
NASCLA Master/Unlimited Electrical Contractor
Exam | Questions And Answers {With Verified
Answers } Rated A | Qs & Ans 2026 | Digital
Download Pdf
1. What is the primary purpose of the National Electrical Code (NEC)?
A. Increase contractor profits
B. Regulate utility billing
C. Provide minimum safety standards for electrical installations
D. Replace state licensing laws
Rationale: The NEC establishes safety requirements to protect people and
property from electrical hazards.
2. Which organization publishes the NEC?
A. OSHA
B. IEEE
C. National Fire Protection Association (NFPA)
D. NASCLA
Rationale: The NFPA is responsible for publishing and updating the NEC.
3. What does “grounding” primarily protect against?
,©
A. Power outages
B. High utility bills
C. Electric shock and fault currents
D. Overbilling
Rationale: Grounding provides a safe path for fault current to reduce
shock hazards.
4. What is the purpose of a circuit breaker?
A. Increase voltage
B. Store electricity
C. Automatically disconnect a circuit during overload or fault
D. Reduce wire size
Rationale: Circuit breakers protect circuits from overcurrent conditions.
5. What does Ohm’s Law state?
A. P = VI
B. I = P/R
C. V = I × R
D. R = V × P
Rationale:
V=IRV = I RV=IR
VsV_sVs
,©
V
RRR
Ω\OmegaΩ
I=VsR=12.0 V6.0 Ω=2.00 AI = \frac{V_s}{R} =
\frac{12.0\,\mathrm{V}}{6.0\,\Omega} = 2.00\,\mathrm{A}I=RVs=6.0Ω12.0V
=2.00A
Vs = 12.0 V+-R = 6.0 ΩI = 2.00 A
Ohm’s Law defines the relationship between voltage, current, and resistance.
6. What unit measures electrical current?
A. Volt
B. Watt
C. Ampere (Amp)
D. Ohm
Rationale: Amperes measure the flow of electric charge.
7. What is the purpose of a GFCI?
A. Increase voltage
B. Store power
C. Protect against ground faults and shock hazards
D. Improve lighting efficiency
, ©
Rationale: GFCIs detect imbalance in current flow and shut off power
quickly.
8. What does a conduit primarily do?
A. Store electricity
B. Increase current
C. Protect and route electrical wiring
D. Generate power
Rationale: Conduit physically protects electrical conductors.
9. What is voltage?
A. Resistance to flow
B. Power usage
C. Electrical potential difference
D. Wire thickness
Rationale: Voltage is the force that pushes electric current.
10. What is the purpose of a transformer?
A. Store electricity
B. Break circuits
C. Increase or decrease voltage levels
D. Measure resistance
