Manitoba Airbrake Practice Exam

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At what pressure level will the safety valve open to allow excess air pressure 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 when the air pressure in a system reaches a certain level to prevent any excess pressure from building up and causing damage. In this scenario, options A, B, and D all have lower pressure levels than C, meaning the safety valve would not open until the pressure reaches 150 PSI. This could potentially lead to an unsafe build-up of pressure before the valve opens. Option C, 150 PSI, is the correct answer as it is the highest pressure level listed and is most likely to trigger the safety valve to open at a safe level.

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