Welcome to the Air Brake Quiz 1. Why should you lock the tractor glad hands to each other, or use dummy couplers when you are NOT towing a trailer?It keeps dirt and water out of the linesThe brake circuit becomes a back-up air tankIt saves wear on the compressorIf you did not, you could never build up system pressure2. 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 tripTravel at a reduced speedStop, check the brakes and make adjustmentsContinue normally, as long as you have some braking power3. The weight of a vehicle is doubled. To stop in the same distance, the braking power must be increased:6 times2 times8 times4 times4. When a trailer without spring parking brakes is disconnected and left parked, you should make sure:The trailer is dynamitedThe wheels are blockedThe air lines are sealedThe brakes are properly adjusted5. When necessary, a driver should use the manual front wheel limiting valve on slippery roads:Instead of the hand valveTo reduce the brake application by 25 percentTo reduce the brake application pressure by 50 percentTo cut out the front wheel brakes6. A tug test on the trailer brakes should be done with the:Parking brake and hand valve appliedFoot valve appliedHand valve appliedParking brake applied7. The 20 lb range between the cut-in and cut-out of the governor serves to:Cool the compressorReduce condensation in the wet tankRemove impurities from the linesGive the system a pressure variation8. The main purpose of the hand valve is to:Supplement the other braking systemControl the amount of application air directed to the tractor brakesControl the amount of application air directed to the trailer brakesAct as an emergency brake if the foot valve fails9. In a 105 PSI system, the governor will cause the compressor to return to its pumping stage at a pressure of:85 PSI95 PSI105 PSI65 PSI10. In a dual circuit air system, air from the primary and secondary air reservoirs is directed to:The relay valveThe front wheel limiting valveThe one-way check valveThe foot valve11. When a compressor discharge line is broken, total loss of air is prevented by the:Governor valveOne-way check valveRelay valveTwo-way check valve12. When the foot and hand valve are operated at maximum at the same time, the application pressure will:Be the same as the reservoir pressureBe less than the reservoir pressureCompound the force exerted on the brake chambersBe greater than reservoir pressure13. The foot valve:Continuously maintain applied pressure when in useAutomatically adjusts to braking requirementsNeeds reservoir pressure to control it to within 10 PSIShould be used instead of the hand valve14. Responsibility for ensuring that the braking system is operational finally rests with the:DriverCompany or ownerCompany mechanicMaintenance crew15. To stop a vehicle, the energy of motion is turned into:FrictionTractionMoisture in the reservoirsHeat in the brake lining and drums16. Reservoirs should be drained at least:Bi-weeklyMonthlyWeeklyDaily17. If the brakes are out of adjustment, the force of the spring brakes when applied will be:VariableGreaterThe sameLess18. The low pressure warning device activates at:85 PSI60 PSI50 PSI40 PSI19. The final factor in determining if a vehicle will move is the amount of:PowerFrictionTractionInertia20. 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 valveEmergency relay valveDual circuit foot valveLimiting valve Your Name Time is Up!