EVITP Practice Test: Questions & Answers: Updated Solution

What is the function of the air compressor in the air braking system? (Ans- The air compressor pumps air into the storage tanks (reservoirs). Can be driven by either gears or a V-Belt (most common) What is the function of the governor in the air braking system? (Ans- The governor controls pressure going into the storage tanks. At what level does the governor shut the compressor off? (Ans- 120 psi True or false: The storage tanks hold enough air to allow the brakes to be used in the event the compressor stops working. (Ans- True What is the function of the tank drain valve? (Ans- The tank drain valve, when opened, will allow any moisture or water to be drained from the air tank at its lowest point. How often should the tank drain valve be opened and for how long? (Ans- The tank drain valve should be opened at least once a week for 2 to 3 seconds then closed.What is the safety relief valve on the air brake system? What level will it pop off? (Ans- A safety relief valve protects the braking system from overpressuring. In most vehicles it will pop off at 150 psi, then reset itself. With drum brakes, which actions take place to create enough friction to stop the vehicle? (Ans- The brake shoes and linings push against the inside of the drum to provide friction needed for stopping. What is the function of the air chamber in the air braking system? (Ans- Holds the parking brake spring and applies pressure to a piston that will push on the s-cam. This puts pressure on the slack adjuster then to the brake pads. What does the air supply gauge allow the driver to do? (Ans- The air supply gauge allows the driver to see pressure in the system at all times, it's also used to check for leaks when the system is off