Saskatchewan Air Brake Practice Questions - Saskatchewan Air Brake (Endorsement A) Exam

How does the low air warning switch mechanically operate, and why does it require an electrical connection to function?

It is a solar-powered sensor that detects air density inside the cab It is a pressure-sensitive diaphragm switch that opens or closes electrical contacts, completing a circuit to power the dash light and buzzer It uses engine oil pressure to complete a mechanical warning circuit It uses high-pressure air to sound a mechanical whistle directly from the tank

Correct Answer:

It is a pressure-sensitive diaphragm switch that opens or closes electrical contacts, completing a circuit to power the dash light and buzzer

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