NICET Electrical Power Testing
Certification Examination – Level II
Practice Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. Which of the following instruments is best suited for measuring
insulation resistance in high-voltage equipment?
A. Voltmeter
B. Ammeter
C. Megohmmeter
D. Oscilloscope
Rationale: A megohmmeter applies a high DC voltage to insulation
and measures resistance, which is essential for detecting insulation
degradation.
,2. What is the primary purpose of a hipot test?
A. Measure current flow
B. Verify insulation strength
C. Check continuity
D. Measure voltage drop
Rationale: Hipot testing applies high voltage to equipment to ensure
insulation can withstand operational stresses without breaking
down.
3. A relay calibration requires applying a current that is 120% of the
pickup setting. If the pickup is 5 A, what current should be applied?
A. 4 A
B. 5 A
C. 6 A
D. 7 A
Rationale: 120% of 5 A is 5 × 1.2 = 6 A, which ensures the relay trips
above its pickup threshold.
4. During a transformer turns ratio test, the measured ratio is
significantly lower than the nameplate ratio. This most likely indicates:
A. Correct winding operation
B. High insulation resistance
C. Shorted turns in the winding
, D. Overheating
Rationale: A lower turns ratio suggests some turns are shorted,
reducing the effective voltage transformation.
5. Which type of fault is commonly tested during circuit breaker timing
tests?
A. Open circuit
B. Short circuit
C. Ground resistance
D. Low voltage
Rationale: Timing tests simulate short-circuit conditions to ensure
breakers operate within specified response times.
6. When performing an insulation resistance test, the measured
resistance decreases over time. This is usually caused by:
A. Clean, dry insulation
B. Moisture or contamination
C. High ambient temperature
D. Correct test procedure
Rationale: Moisture and contamination reduce insulation resistance,
causing readings to drop during prolonged testing.
, 7. What is the standard unit of measurement for insulation resistance?
A. Ohms
B. Volts
C. Amps
D. Megohms
Rationale: Insulation resistance is typically very high and measured
in megohms (millions of ohms).
8. In a high-voltage test, the voltage is gradually increased until a
predetermined level is reached. This procedure is called:
A. Continuity testing
B. Ground resistance testing
C. Step voltage testing
D. Current injection
Rationale: Step voltage testing gradually increases voltage to
observe insulation behavior under controlled conditions.
9. The primary reason for performing a power factor test on a
transformer is to:
A. Measure temperature
B. Check current flow
C. Assess insulation condition
D. Verify voltage rating
Certification Examination – Level II
Practice Questions And Correct Answers
(Verified Answers) Plus Rationales 2026
Q&A | Instant Download Pdf
1. Which of the following instruments is best suited for measuring
insulation resistance in high-voltage equipment?
A. Voltmeter
B. Ammeter
C. Megohmmeter
D. Oscilloscope
Rationale: A megohmmeter applies a high DC voltage to insulation
and measures resistance, which is essential for detecting insulation
degradation.
,2. What is the primary purpose of a hipot test?
A. Measure current flow
B. Verify insulation strength
C. Check continuity
D. Measure voltage drop
Rationale: Hipot testing applies high voltage to equipment to ensure
insulation can withstand operational stresses without breaking
down.
3. A relay calibration requires applying a current that is 120% of the
pickup setting. If the pickup is 5 A, what current should be applied?
A. 4 A
B. 5 A
C. 6 A
D. 7 A
Rationale: 120% of 5 A is 5 × 1.2 = 6 A, which ensures the relay trips
above its pickup threshold.
4. During a transformer turns ratio test, the measured ratio is
significantly lower than the nameplate ratio. This most likely indicates:
A. Correct winding operation
B. High insulation resistance
C. Shorted turns in the winding
, D. Overheating
Rationale: A lower turns ratio suggests some turns are shorted,
reducing the effective voltage transformation.
5. Which type of fault is commonly tested during circuit breaker timing
tests?
A. Open circuit
B. Short circuit
C. Ground resistance
D. Low voltage
Rationale: Timing tests simulate short-circuit conditions to ensure
breakers operate within specified response times.
6. When performing an insulation resistance test, the measured
resistance decreases over time. This is usually caused by:
A. Clean, dry insulation
B. Moisture or contamination
C. High ambient temperature
D. Correct test procedure
Rationale: Moisture and contamination reduce insulation resistance,
causing readings to drop during prolonged testing.
, 7. What is the standard unit of measurement for insulation resistance?
A. Ohms
B. Volts
C. Amps
D. Megohms
Rationale: Insulation resistance is typically very high and measured
in megohms (millions of ohms).
8. In a high-voltage test, the voltage is gradually increased until a
predetermined level is reached. This procedure is called:
A. Continuity testing
B. Ground resistance testing
C. Step voltage testing
D. Current injection
Rationale: Step voltage testing gradually increases voltage to
observe insulation behavior under controlled conditions.
9. The primary reason for performing a power factor test on a
transformer is to:
A. Measure temperature
B. Check current flow
C. Assess insulation condition
D. Verify voltage rating
