Q
93. The trailer air supply control (also known as the tractor protection valve control) should automatically close when the air pressure falls to between:
Combination Vehiclesmedium
Aa. 60 and 80 psi.
Bb. 45 and 60 psi.
Cc. 20 and 45 psi.
Detailed Explanation
The correct answer is "c. 20 and 45 psi.". This is based on federal CDL regulations and safety standards.
Correct Answer: c. 20 and 45 psi.
Advertisement
Ready to practice for real?
Take our free, full-length Combination Vehicles practice test. Simulates the actual DMV exam with timed questions.
Start Practice TestRelated Questions
To prevent a rollover, a driver should:
combination-vehiclesmedium
7. You supply air to the trailer tanks by:
combination-vehiclesmedium
When traveling more slowly than 40 mph, maintain at least ____ of following distance per every 10 feet of your vehicle.
combination-vehicleseasy
Trailers with low underneath clearance may be difficult to drive:
combination-vehiclesmedium
18. You have a major leak in the service line and you put on the brakes. Service air pressure will escape and cause the:
combination-vehiclesmedium
Advertisement