Practice question

Air tank drains:

  1. Allow rain water to enter air tanks.
  2. Are used to drain water and oil from air tanks.
  3. Should never be opened.
  4. Must remain open while driving.

Answer: B — Are used to drain water and oil from air tanks.

The correct answer is shown above. Try the full quiz for additional practice.

Practice more: North Dakota CDL Air Brakes Test 2 →