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NASCLA Commercial General Building Contractor — Practice Exam

Doors, windows and glazing: practice questions

Our NASCLA Commercial GC bank has 10 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

What is the purpose of a low-e coating on glass?

  1. To reduce radiant heat transfer through the glass
  2. To tint the glass dark
  3. To make the glass shatterproof
  4. To block all visible light from entering the room
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A. To reduce radiant heat transfer through the glass — It improves the window's energy performance.

Question 2

At what height must door hardware be mounted under the 2010 ADA Standards?

  1. 34 to 48 inches above the floor
  2. Any height that is convenient
  3. 48 to 60 inches above the floor
  4. 24 to 36 inches above the floor
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A. 34 to 48 inches above the floor — Hardware must be operable without tight grasping or twisting (ADA 404.2.7).

Question 3

What must be done to a labeled fire door assembly in the field?

  1. Cut louvers in it to improve airflow between rooms
  2. Keep it as labeled; don't modify it in ways the listing doesn't allow
  3. Remove the label after installation
  4. Add a doorstop to hold it open
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B. Keep it as labeled; don't modify it in ways the listing doesn't allow — Field changes can void the rating.

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