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Journeyman Electrician Exam (NEC-based)

Scenarios: practice questions

Our Journeyman Electrician bank has 15 questions on this topic. Here are 3 of them with answers; the full mock exam draws from every topic, like the real one.

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Question 1

Lights dim when a large motor starts. What is the likely cause?

  1. An overvoltage on the utility side when the motor starts up
  2. Voltage drop from high inrush current
  3. A blown fuse
  4. A ground fault
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B. Voltage drop from high inrush current — Motor starting current can be several times running current.

Question 2

A homeowner asks for a 240-volt circuit for a 30-amp EV charger used continuously. What breaker is needed?

  1. 30-amp
  2. 35-amp
  3. 50-amp
  4. 40-amp
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D. 40-amp — 30 A × 125% = 37.5 A; next standard size is 40 A.

Question 3

A conduit run has five 90-degree bends between boxes. What should be done?

  1. Use smaller wire
  2. Add a pull box so no section exceeds 360 degrees of bends
  3. Pull harder
  4. Nothing
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B. Add a pull box so no section exceeds 360 degrees of bends — Excessive bends damage insulation.

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