Practice question

What is the purpose of the safety relief valve installed on the supply (wet) air reservoir?

  1. To release compressed air to sound the air horn
  2. To protect the system from excessive pressure buildup (typically opening around 150 psi) if the governor fails to cut out
  3. To pump air into flat tyres while driving
  4. To cool the transmission oil

Answer: B — To protect the system from excessive pressure buildup (typically opening around 150 psi) if the governor fails to cut out

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