Welcome to the Air Brake Quiz 1. The final factor in determining if a vehicle will move is the amount of: Friction Traction Power Inertia2. Why should you lock the tractor glad hands to each other, or use dummy couplers when you are NOT towing a trailer? If you did not, you could never build up system pressure The brake circuit becomes a back-up air tank It saves wear on the compressor It keeps dirt and water out of the lines3. To stop a vehicle, the energy of motion is turned into: Heat in the brake lining and drums Traction Friction Moisture in the reservoirs4. If the brakes are out of adjustment, the force of the spring brakes when applied will be: Greater Variable Less The same5. When necessary, a driver should use the manual front wheel limiting valve on slippery roads: To reduce the brake application by 25 percent Instead of the hand valve To reduce the brake application pressure by 50 percent To cut out the front wheel brakes6. The foot valve: Needs reservoir pressure to control it to within 10 PSI Should be used instead of the hand valve Automatically adjusts to braking requirements Continuously maintain applied pressure when in use7. Responsibility for ensuring that the braking system is operational finally rests with the: Company or owner Driver Company mechanic Maintenance crew8. In a 105 PSI system, the governor will cause the compressor to return to its pumping stage at a pressure of: 105 PSI 95 PSI 85 PSI 65 PSI9. The main purpose of the hand valve is to: Act as an emergency brake if the foot valve fails Control the amount of application air directed to the tractor brakes Supplement the other braking system Control the amount of application air directed to the trailer brakes10. The 20 lb range between the cut-in and cut-out of the governor serves to: Reduce condensation in the wet tank Cool the compressor Remove impurities from the lines Give the system a pressure variation11. In a dual circuit air system, air from the primary and secondary air reservoirs is directed to: The relay valve The one-way check valve The foot valve The front wheel limiting valve12. The low pressure warning device activates at: 60 PSI 40 PSI 50 PSI 85 PSI13. In a dual circuit air system, the valve that protects the primary circuit from air loss in the secondary circuit is the: Two-way check valve Emergency relay valve Dual circuit foot valve Limiting valve14. When a compressor discharge line is broken, total loss of air is prevented by the: Two-way check valve Relay valve Governor valve One-way check valve15. Reservoirs should be drained at least: Bi-weekly Monthly Weekly Daily16. A tug test on the trailer brakes should be done with the: Hand valve applied Foot valve applied Parking brake and hand valve applied Parking brake applied17. If your brakes do not seem to be holding even when air pressure is sufficient, you should: Travel at a reduced speed Stop, check the brakes and make adjustments Report the condition at the end of the trip Continue normally, as long as you have some braking power18. When the foot and hand valve are operated at maximum at the same time, the application pressure will: Compound the force exerted on the brake chambers Be greater than reservoir pressure Be the same as the reservoir pressure Be less than the reservoir pressure19. When a trailer without spring parking brakes is disconnected and left parked, you should make sure: The trailer is dynamited The brakes are properly adjusted The wheels are blocked The air lines are sealed20. The weight of a vehicle is doubled. To stop in the same distance, the braking power must be increased: 4 times 2 times 6 times 8 times Your Name Time is Up!