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NASCLA Commercial General Building Contractor — Practice Exam

Electrical: practice questions

Our NASCLA Commercial GC bank has 8 questions on this topic. Here are 4 of them with answers; the full mock exam draws from every topic, like the real one.

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Question 1

What must be done before working on de-energized electrical equipment that could be energized?

  1. Wear rubber boots only
  2. Ask the electrician to watch while the work is done on it
  3. Work quickly
  4. Deactivate it and tag (and lock) the controls
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D. Deactivate it and tag (and lock) the controls — OSHA 1926.417.

Question 2

Under OSHA, what type of extension cords must be used with portable tools on construction sites?

  1. Any cord with a plug
  2. Three-wire cords designed for hard or extra-hard usage
  3. Two-wire household cords
  4. Flat lamp cord rated for indoor use in dry locations
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B. Three-wire cords designed for hard or extra-hard usage — OSHA 1926.405(a)(2)(ii)(J).

Question 3

Why must damaged extension cords be removed from service?

  1. They are hard to coil
  2. They lose voltage
  3. Damaged insulation exposes workers to shock and fire hazards
  4. They weigh more than new cords of the same gauge and length
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C. Damaged insulation exposes workers to shock and fire hazards — Inspect cords before each use.

Question 4

How must temporary lights on a construction site be protected?

  1. With tape over the socket
  2. With paint
  3. They need no protection if they hang more than 7 feet above the floor
  4. With guards to prevent accidental contact with the bulb
Show the answer

D. With guards to prevent accidental contact with the bulb — Lamps must not be suspended by their cords unless designed for it (1926.405(a)(2)(ii)).

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