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Free Industrial Electrician Practice Questions

10 free, exam-style Industrial Electrician (NCCER) (Industrial Electrician) practice questions with answers and explanations. No signup required. Work through them below, then take the full free Industrial Electrician practice test to study every exam domain.

The Industrial Electrician exam has 100 questions and runs 3 hours.

Question 1

An electrician has shut down a piece of equipment, isolated the energy source, and applied a personal lock and tag to the disconnect. What must be done before any work begins on the circuit?

  1. Verify a zero-energy state by testing the circuit with a meter
  2. Notify all affected employees that the repair work is now starting
  3. Briefly remove the lock to confirm the equipment will not restart
  4. Apply a second backup lock to the same disconnecting means
Show answer & explanation

Correct answer: A - Verify a zero-energy state by testing the circuit with a meter

Question 2

An electrician is determining the boundary that protects a worker from the pressure wave, intense sound, and flying molten debris released during a high-current fault. This hazard is BEST described as:

  1. Electric shock, as current passes through the body
  2. A ground fault returning on the equipment path
  3. An arc flash, radiating intense heat and light
  4. An arc blast, producing the pressure wave and debris
Show answer & explanation

Correct answer: D - An arc blast, producing the pressure wave and debris

Question 3

An equipment grounding conductor (EGC) is sized based on the rating of the overcurrent device protecting the circuit. Which NEC table provides this sizing?

  1. Table 250.66
  2. Table 250.122
  3. Table 310.16
  4. Table 250.102(C)(1)
Show answer & explanation

Correct answer: B - Table 250.122

Question 4

At the service equipment, the main bonding jumper connects the grounded (neutral) conductor to the equipment grounding system. The conductor that makes this same connection at a separately derived system, such as a transformer secondary, is the:

  1. Grounding electrode conductor, run to building steel
  2. Equipment grounding conductor of the feeder
  3. System bonding jumper, made at the secondary
  4. Grounded service conductor from the utility
Show answer & explanation

Correct answer: C - System bonding jumper, made at the secondary

Question 5

Three 30-ohm resistors are connected in parallel across a single source. What is the total resistance of the circuit?

  1. 10 ohms
  2. 30 ohms
  3. 90 ohms
  4. 0.1 ohms
Show answer & explanation

Correct answer: A - 10 ohms

Question 6

In a series circuit containing three resistors of different values, which electrical quantity has the same value through every resistor in the circuit?

  1. The voltage dropped across each individual resistor
  2. The power that is dissipated by each resistor
  3. The resistance value of each individual resistor
  4. The current, which is the same at every point
Show answer & explanation

Correct answer: D - The current, which is the same at every point

Question 7

To measure the amount of current flowing through a load, an ammeter must be connected:

  1. In parallel, across the load terminals
  2. In series, so all load current flows through it
  3. Across the output terminals of the source
  4. Between the grounded and grounding conductors
Show answer & explanation

Correct answer: B - In series, so all load current flows through it

Question 8

When terminating aluminum conductors in a mechanical lug, an electrician applies an antioxidant (oxide-inhibiting) compound to the connection PRIMARILY to:

  1. Lubricate the strands so the conductor seats fully in the lug
  2. Improve the flexibility of the conductor as it is bent into place
  3. Prevent the formation of high-resistance aluminum oxide
  4. Seal the finished termination against airborne moisture intrusion
Show answer & explanation

Correct answer: C - Prevent the formation of high-resistance aluminum oxide

Question 9

The RMS (effective) value of a sinusoidal AC voltage is equal to the peak voltage multiplied by approximately:

  1. 0.707
  2. 1.414
  3. 1.732
  4. 0.637
Show answer & explanation

Correct answer: A - 0.707

Question 10

What is the synchronous speed of a 6-pole, three-phase induction motor that is connected to a 60 Hz power supply?

  1. 3,600 rpm
  2. 1,800 rpm
  3. 900 rpm
  4. 1,200 rpm
Show answer & explanation

Correct answer: D - 1,200 rpm

What's on the Industrial Electrician exam

The Industrial Electrician (NCCER) (Industrial Electrician) exam is organized into 25 knowledge domains. These free practice questions are drawn from across them so you can see where you're strong and where to study:

  1. Safety for Electricians - Module 26102 8% of exam
  2. Introduction to Electrical Circuits - Module 26103 4% of exam
  3. Electrical Theory - Module 26104 5% of exam
  4. Wireways, Raceways, and Fittings - Module 26108 4% of exam
  5. Conductors and Cables - Module 26109 2% of exam
  6. Electrical Test Equipment - Module 26112 5% of exam
  7. Alternating Current - Module 26201 4% of exam
  8. Motors: Theory and Application - Module 26202 4% of exam
  9. Conduit Bending - Module 26204 4% of exam
  10. Pull and Junction Boxes - Module 26205 4% of exam
  11. Conductor Installations - Module 26206 4% of exam
  12. Cable Tray - Module 26207 4% of exam
  13. Conductor Terminations and Splices - Module 26208 5% of exam
  14. Grounding and Bonding - Module 26209 6% of exam
  15. Conductor Selection and Calculations - Module 26302 3% of exam
  16. Hazardous Locations - Module 26304 4% of exam
  17. Overcurrent Protection - Module 26305 4% of exam
  18. Distribution Equipment - Module 26306 3% of exam
  19. Transformers - Module 26307 4% of exam
  20. Motor Calculations - Module 26309 3% of exam
  21. Motor Controls - Module 26311 4% of exam
  22. Specialty Transformers - Module 26406 3% of exam
  23. Advanced Controls - Module 26407 3% of exam
  24. Heat Tracing and Freeze Protection - Module 26409 3% of exam
  25. Medium-Voltage Terminations/Splices - Module 26411 3% of exam

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