Practice question

What does an air dryer do?

  1. It eliminates tank draining forever
  2. It removes moisture from compressed air before it enters the supply tank
  3. It applies the spring brakes for parking
  4. It measures pushrod stroke

Answer: B — It removes moisture from compressed air before it enters the supply tank

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

Practice more: Ontario Air Brake Z Test Practice Questions - Ontario Air Brake (Z Endorsement) Knowledge Test Exam →