Alberta Air Brake (Q) Knowledge Test Practice Questions - Alberta Air Brake (Q Endorsement) Knowledge Test Exam - Variant 2

During Alberta's tractor protection check, at what pressure should the trailer air supply valve pop out?

At 40 to 60 PSI or higher At exactly 10 PSI only At 120 to 135 PSI Only after pressure reaches zero

Correct Answer:

At 40 to 60 PSI or higher

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