Welcome to the Air Brake Quiz 1. The weight of a vehicle is doubled. To stop in the same distance, the braking power must be increased:8 times6 times2 times4 times2. The low pressure warning device activates at:40 PSI50 PSI85 PSI60 PSI3. Responsibility for ensuring that the braking system is operational finally rests with the:Company or ownerCompany mechanicMaintenance crewDriver4. The final factor in determining if a vehicle will move is the amount of:InertiaTractionFrictionPower5. In a dual circuit air system, air from the primary and secondary air reservoirs is directed to:The foot valveThe one-way check valveThe relay valveThe front wheel limiting valve6. When a compressor discharge line is broken, total loss of air is prevented by the:One-way check valveGovernor valveRelay valveTwo-way check valve7. In a dual circuit air system, the valve that protects the primary circuit from air loss in the secondary circuit is the:Dual circuit foot valveTwo-way check valveEmergency relay valveLimiting valve8. The 20 lb range between the cut-in and cut-out of the governor serves to:Give the system a pressure variationCool the compressorReduce condensation in the wet tankRemove impurities from the lines9. When a trailer without spring parking brakes is disconnected and left parked, you should make sure:The wheels are blockedThe trailer is dynamitedThe air lines are sealedThe brakes are properly adjusted10. If your brakes do not seem to be holding even when air pressure is sufficient, you should:Report the condition at the end of the tripContinue normally, as long as you have some braking powerStop, check the brakes and make adjustmentsTravel at a reduced speed11. If the brakes are out of adjustment, the force of the spring brakes when applied will be:LessThe sameVariableGreater12. When the foot and hand valve are operated at maximum at the same time, the application pressure will:Be greater than reservoir pressureBe less than the reservoir pressureBe the same as the reservoir pressureCompound the force exerted on the brake chambers13. Why should you lock the tractor glad hands to each other, or use dummy couplers when you are NOT towing a trailer?The brake circuit becomes a back-up air tankIt keeps dirt and water out of the linesIf you did not, you could never build up system pressureIt saves wear on the compressor14. In a 105 PSI system, the governor will cause the compressor to return to its pumping stage at a pressure of:65 PSI105 PSI95 PSI85 PSI15. When necessary, a driver should use the manual front wheel limiting valve on slippery roads:To reduce the brake application by 25 percentTo cut out the front wheel brakesTo reduce the brake application pressure by 50 percentInstead of the hand valve16. Reservoirs should be drained at least:Bi-weeklyMonthlyDailyWeekly17. The main purpose of the hand valve is to:Act as an emergency brake if the foot valve failsSupplement the other braking systemControl the amount of application air directed to the tractor brakesControl the amount of application air directed to the trailer brakes18. A tug test on the trailer brakes should be done with the:Parking brake appliedHand valve appliedFoot valve appliedParking brake and hand valve applied19. The foot valve:Continuously maintain applied pressure when in useShould be used instead of the hand valveAutomatically adjusts to braking requirementsNeeds reservoir pressure to control it to within 10 PSI20. To stop a vehicle, the energy of motion is turned into:Moisture in the reservoirsTractionFrictionHeat in the brake lining and drums Your Name Time is Up!