Answer :
Final answer:
The tractor protection valve is vital for maintaining safety in tractor-trailer operations, designed to automatically close within the pressure range of 60-80 psi to prevent air pressure loss in the tractor. The correct answer is (b).
Explanation:
The tractor protection valve is designed to ensure the safety of both the tractor and the trailer in a tractor-trailer combination by maintaining air pressure within a safe range. The correct answer to the question, 'The tractor protection valve is designed to close automatically if the air pressure falls into the specified pressure range by the manufacturer', is b) 60-80 psi. T
his pressure range is critical because it prevents the loss of air pressure in the tractor, ensuring that the vehicle can be safely stopped. The tractor protection valve acts as a safeguard, ensuring that the tractor's brakes will be operational, even if the trailer experiences a significant air leak.
