Air Brake Coach
System partsQuestion 13 of 116

A chamber has a diaphragm area of 20 square inches. The air pressure is 10 PSI. What force acts on the push plate?

  1. 10 pounds
  2. 30 pounds
  3. 20 pounds
  4. 200 pounds
Show answer

Correct answer: 200 pounds

Force is pressure times area. 10 PSI on 20 square inches gives 200 pounds.

Source: Air Brake Manual: A Guide for Instructors (Government of Alberta, Alberta Transportation, March/April 2012), Module 4: Service circuits, page 49

Practice system parts

Questions last reviewed: 18 October 2026