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Answer :
Final answer:
The correct option is: a. Trailer hand valve. The Trailer Hand Valve is the knob you actuate to supply air to a semi-truck or similar large vehicle's trailer. This valve controls the air pressure supplied to the trailer's brakes, releasing them and enabling the trailer to move.
Explanation:
In the context of operating a semi-truck or similar large vehicle, the knob you would actuate to supply air to your trailer is the Trailer Hand Valve. This knob, often on the vehicle's dashboard, controls the air pressure supplied to the trailer's brakes. When you actuate this valve, it releases air into the trailer's brake system, allowing the brakes to release and the trailer to move. But note, the use of the trailer hand valve while driving can potentially cause a jackknife if not used properly. Other options listed such as a) the tractor protection valve, b) the service brake pedal, and c) the accelerator pedal, while also parts of the vehicle's air brake system, do not directly control the supply of air to the trailer.
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