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Engineering Technician

NICET Electrical Power Testing Level II Exam Practice Test

Electrical power testing examines the condition and operation of equipment used in power systems. Practice questions cover measurement and test procedures for transformers, motors, grounding systems, protective relays, voltage regulators, and high-voltage insulation. They emphasize interpreting readings in context, following approved connections and test sequences, and recognizing when a result may indicate an equipment or setup problem.

Exam overview

Exam providerNational Institute for Certification in Engineering Technologies
Exam codeNot listed
CategoryEngineering Technician

About the NICET Electrical Power Testing Level II Exam

The work represented in these questions requires technicians to connect test equipment correctly, verify outputs at the test leads, and follow safe procedures for isolated equipment. Measurement tasks include comparing three-phase motor winding resistance, accounting for temperature when interpreting transformer insulation-resistance results, and moving an auxiliary probe during fall-of-potential grounding tests. Other scenarios address dielectric withstand and capacitance or dissipation-factor testing, where changes in leakage current or insulation losses help characterize condition. Protection and control checks include confirming relay settings against a coordination study, testing trip-circuit operation, routing primary current through the intended sensing path, and checking regulator wiring against approved diagrams. The practical skill is distinguishing a meaningful equipment response from a test setup, connection, or measurement issue before recording and reporting results.

Sample Practice Questions

Review a selection from this exam's published US Practice Tests practice bank.

Question 1

During an acceptance test, a transformer winding's insulation-resistance reading changes substantially with temperature. Which practice best supports a valid comparison with a previous result?

  1. ACompare readings without recording temperature because resistance is temperature independent
  2. BRecord winding temperature and use an appropriate temperature correction or comparison basis
  3. CIncrease test voltage until the reading matches the previous value
  4. DUse the lowest reading from any test duration as the temperature-corrected result
Show answerCorrect answer: B

Insulation resistance varies with temperature. Recording temperature and applying an accepted correction method, where applicable, helps distinguish a real insulation-condition change from a temperature-related difference.

Question 2

A protective relay’s settings are being reviewed against a coordination study. What is the most useful first check for confirming that the settings were entered as intended?

  1. ACompare the relay’s displayed or downloaded settings with the approved settings record
  2. BIncrease every pickup setting by the same percentage
  3. CConfirm only that the relay has power
  4. DDisconnect the trip output and assume the settings are unchanged
Show answerCorrect answer: A

Comparing the actual relay settings with the approved settings record directly identifies entry or configuration discrepancies. The review should use controlled records and follow the applicable work process.

Question 3

A technician measures the resistance of a grounding electrode system using a fall-of-potential method. What is the general purpose of moving the auxiliary potential probe during the test?

  1. ATo locate a stable region of the potential gradient for estimating electrode resistance
  2. BTo increase the current rating of the grounding conductor
  3. CTo determine the phase sequence of the supply
  4. DTo measure the electrode's insulation resistance at operating voltage
Show answerCorrect answer: A

In the fall-of-potential method, the potential probe is repositioned to assess the voltage gradient in the soil. A stable portion of the measured profile supports a more reliable estimate of the grounding system's resistance.

Question 4

A technician is testing a protective device using a portable test set. Why should the test set’s output be verified at the intended test leads before connecting them to the device?

  1. ATo confirm the output is within the expected range and the leads are connected to the correct output
  2. BTo increase the device’s pickup setting temporarily
  3. CTo bypass the device’s internal sensing circuit
  4. DTo ensure the device is isolated from its enclosure ground
Show answerCorrect answer: A

Verifying the test-set output and lead connections helps prevent incorrect test values, miswiring, or damage to the device. Use the test set’s rated limits and the device manufacturer’s instructions when selecting outputs and connections.

Question 5

A technician is performing a dielectric withstand test on isolated equipment. What does a steadily increasing leakage current during the voltage hold most strongly suggest?

  1. AThe test circuit is automatically correcting its voltage
  2. BInsulation condition may be deteriorating or a discharge may be developing
  3. CThe equipment has reached thermal equilibrium and is necessarily safe
  4. DThe test voltage is below the instrument's measurement range
Show answerCorrect answer: B

A rising leakage current during a sustained dielectric test can indicate developing insulation breakdown, surface tracking, or another deterioration mechanism. The test should be stopped according to the approved procedure if the current exceeds limits or shows an unacceptable trend.

Question 6

A technician is performing a primary-current test on a protection circuit. Why is it important to route the test conductor through the intended sensing path and in the specified direction?

  1. AThe conductor’s path and direction determine whether the intended sensing element responds as expected
  2. BThe direction sets the insulation resistance of the circuit
  3. CThe routing changes the nominal system frequency
  4. DThe direction eliminates the need to verify test current
Show answerCorrect answer: A

Primary-current tests depend on the current passing through the intended sensing element in the correct path. Incorrect routing or direction can produce misleading results or fail to exercise the intended protection function. Follow equipment-specific test instructions.

Question 7

When checking a protective relay’s trip circuit, what does a successful functional test of the trip output primarily verify?

  1. AThat the relay’s internal clock is synchronized to the utility
  2. BThat the relay output can operate the intended trip path under the test conditions
  3. CThat the circuit breaker has the required interrupting rating
  4. DThat the current transformer ratio matches the nameplate
Show answerCorrect answer: B

A trip-circuit functional check verifies operation of the relay output and the connected control path included in the test, such as wiring and trip-coil actuation when those components are within scope. It does not establish breaker interrupting capability or CT ratio.

How to use this practice test

The free practice bank contains 50 questions. Each session presents up to 20 random questions, with results shown after the session. Use a session to work through equipment-testing scenarios, then review any missed items by identifying the measurement purpose, connection requirement, or interpretation issue involved.

Preparation tips

  • For insulation-resistance comparisons, note winding temperature and determine whether readings need temperature correction before judging a change.
  • Review fall-of-potential test geometry and how relocating the potential probe helps assess whether the measured resistance is stable.
  • Trace relay and trip-circuit diagrams from settings and sensing inputs through the output path; verify test-lead placement and current direction before testing.
  • Compare three-phase winding-resistance readings across corresponding terminals, and consider connection quality and temperature when investigating imbalance.
  • Distinguish the information provided by dielectric withstand, insulation resistance, capacitance, and dissipation-factor tests.
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