Air Brake (Q Endorsement) Practice · Question
If the air compressor governor 'cuts out' at 125 psi, what should be the typical 'cut-in' pressure?
Air brake systems typically have a pressure differential of about 20-30 psi between cut-out and cut-in. If cut-out is 125 psi, cut-in would generally be around
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Question: If the air compressor governor 'cuts out' at 125 psi, what should be the typical 'cut-in' pressure?
Answer options:
- Approximately 100 psi. ✅ Approximately 85 psi.
- Approximately 115 psi.
- Approximately 95 psi.
Correct answer: Approximately 85 psi.
Explanation: Air brake systems typically have a pressure differential of about 20-30 psi between cut-out and cut-in. If cut-out is 125 psi, cut-in would generally be around 85-100 psi, with 85 psi being a common lower limit.
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