NCCER Electrical Level 2 Certification
Exam Newest 2026 Updated Practice
Exam | 100 Most Tested Questions
Collection & Verified Detailed Answers |
Tutor Verified Success Exam) Graded A+
1. What is the primary purpose of a transformer in an electrical system?
A. Convert AC to DC
B. Increase or decrease voltage
C. Store electrical energy
D. Measure current
Answer: B. Increase or decrease voltage ✔
Rationale: A transformer operates on electromagnetic induction to step up or
step down voltage, not convert current type or store energy.
2. Which instrument is used to measure insulation resistance?
A. Voltmeter
B. Ammeter
C. Megohmmeter
D. Ohmmeter
Answer: C. Megohmmeter ✔
Rationale: A megohmmeter applies high voltage to test insulation integrity,
ensuring safe electrical operation.
,3. According to the NEC, what color is typically used for grounded conductors?
A. Green
B. White or gray
C. Red
D. Black
Answer: B. White or gray ✔
Rationale: The grounded (neutral) conductor is identified by white or gray
insulation per NEC standards.
4. What does Ohm’s Law state?
A. Power equals voltage divided by resistance
B. Voltage equals current times resistance
C. Resistance equals power times voltage
D. Current equals resistance divided by voltage
Answer: B. Voltage equals current times resistance ✔
Rationale: Ohm’s Law (V = IR) defines the relationship between voltage, current,
and resistance.
5. What is the function of a GFCI?
A. Protect against overload
B. Protect against short circuit
C. Protect against ground fault
D. Regulate voltage
Answer: C. Protect against ground fault ✔
Rationale: A Ground Fault Circuit Interrupter detects imbalance between hot
and neutral, preventing electric shock hazards.
6. Which conduit type is best for corrosive environments?
A. EMT
B. RMC
, C. PVC
D. FMC
Answer: C. PVC ✔
Rationale: PVC conduit resists corrosion and moisture, making it ideal for harsh
environments.
7. What is the unit of electrical power?
A. Volt
B. Ampere
C. Watt
D. Ohm
Answer: C. Watt ✔
Rationale: Power is measured in watts (W) and represents energy consumption
rate.
8. What type of motor is commonly used for constant speed applications?
A. Universal motor
B. Induction motor
C. Stepper motor
D. DC motor
Answer: B. Induction motor ✔
Rationale: Induction motors provide reliable constant speed and are widely used
in industrial settings.
9. What does NEC stand for?
A. National Electrical Code
B. National Energy Council
C. New Electrical Circuit
D. Neutral Energy Code
Answer: A. National Electrical Code ✔
Exam Newest 2026 Updated Practice
Exam | 100 Most Tested Questions
Collection & Verified Detailed Answers |
Tutor Verified Success Exam) Graded A+
1. What is the primary purpose of a transformer in an electrical system?
A. Convert AC to DC
B. Increase or decrease voltage
C. Store electrical energy
D. Measure current
Answer: B. Increase or decrease voltage ✔
Rationale: A transformer operates on electromagnetic induction to step up or
step down voltage, not convert current type or store energy.
2. Which instrument is used to measure insulation resistance?
A. Voltmeter
B. Ammeter
C. Megohmmeter
D. Ohmmeter
Answer: C. Megohmmeter ✔
Rationale: A megohmmeter applies high voltage to test insulation integrity,
ensuring safe electrical operation.
,3. According to the NEC, what color is typically used for grounded conductors?
A. Green
B. White or gray
C. Red
D. Black
Answer: B. White or gray ✔
Rationale: The grounded (neutral) conductor is identified by white or gray
insulation per NEC standards.
4. What does Ohm’s Law state?
A. Power equals voltage divided by resistance
B. Voltage equals current times resistance
C. Resistance equals power times voltage
D. Current equals resistance divided by voltage
Answer: B. Voltage equals current times resistance ✔
Rationale: Ohm’s Law (V = IR) defines the relationship between voltage, current,
and resistance.
5. What is the function of a GFCI?
A. Protect against overload
B. Protect against short circuit
C. Protect against ground fault
D. Regulate voltage
Answer: C. Protect against ground fault ✔
Rationale: A Ground Fault Circuit Interrupter detects imbalance between hot
and neutral, preventing electric shock hazards.
6. Which conduit type is best for corrosive environments?
A. EMT
B. RMC
, C. PVC
D. FMC
Answer: C. PVC ✔
Rationale: PVC conduit resists corrosion and moisture, making it ideal for harsh
environments.
7. What is the unit of electrical power?
A. Volt
B. Ampere
C. Watt
D. Ohm
Answer: C. Watt ✔
Rationale: Power is measured in watts (W) and represents energy consumption
rate.
8. What type of motor is commonly used for constant speed applications?
A. Universal motor
B. Induction motor
C. Stepper motor
D. DC motor
Answer: B. Induction motor ✔
Rationale: Induction motors provide reliable constant speed and are widely used
in industrial settings.
9. What does NEC stand for?
A. National Electrical Code
B. National Energy Council
C. New Electrical Circuit
D. Neutral Energy Code
Answer: A. National Electrical Code ✔
