Manitoba Airbrake Practice Exam

At what pressure level will the safety valve open to allow excess air to escape?

1. 100 psi

2. 120 psi

3. 150 psi

4. 200 psi

The correct answer is: 150 psi

The safety valve is designed to open and release excess air when the pressure inside a system reaches a certain level. It is important for this valve to only open when necessary to prevent malfunction or damage to the system. The other options, A, B, and D, may be too low or too high of a pressure for the safety valve to properly function. Option C, at 150 psi, is the most likely pressure level for the safety valve to open and release excess air. Therefore, it is the correct answer.