Welcome to the Air Brake Quiz 1. 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 adjusted2. If your brakes do not seem to be holding even when air pressure is sufficient, you should:Travel at a reduced speedStop, check the brakes and make adjustmentsContinue normally, as long as you have some braking powerReport the condition at the end of the trip3. 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 valveLimiting valveTwo-way check valveEmergency relay valve4. The main purpose of the hand valve is to:Control the amount of application air directed to the tractor brakesSupplement the other braking systemControl the amount of application air directed to the trailer brakesAct as an emergency brake if the foot valve fails5. To stop a vehicle, the energy of motion is turned into:Moisture in the reservoirsTractionHeat in the brake lining and drumsFriction6. When necessary, a driver should use the manual front wheel limiting valve on slippery roads:To reduce the brake application pressure by 50 percentInstead of the hand valveTo cut out the front wheel brakesTo reduce the brake application by 25 percent7. The final factor in determining if a vehicle will move is the amount of:TractionPowerInertiaFriction8. 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 tankIf you did not, you could never build up system pressureIt saves wear on the compressorIt keeps dirt and water out of the lines9. A tug test on the trailer brakes should be done with the:Parking brake appliedParking brake and hand valve appliedHand valve appliedFoot valve applied10. 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 PSI11. In a dual circuit air system, air from the primary and secondary air reservoirs is directed to:The foot valveThe relay valveThe front wheel limiting valveThe one-way check valve12. When a compressor discharge line is broken, total loss of air is prevented by the:Governor valveRelay valveOne-way check valveTwo-way check valve13. If the brakes are out of adjustment, the force of the spring brakes when applied will be:GreaterThe sameVariableLess14. When the foot and hand valve are operated at maximum at the same time, the application pressure will:Be the same as the reservoir pressureCompound the force exerted on the brake chambersBe less than the reservoir pressureBe greater than reservoir pressure15. Responsibility for ensuring that the braking system is operational finally rests with the:Company mechanicDriverCompany or ownerMaintenance crew16. The weight of a vehicle is doubled. To stop in the same distance, the braking power must be increased:2 times6 times8 times4 times17. The low pressure warning device activates at:40 PSI50 PSI85 PSI60 PSI18. The foot valve:Automatically adjusts to braking requirementsShould be used instead of the hand valveContinuously maintain applied pressure when in useNeeds reservoir pressure to control it to within 10 PSI19. Reservoirs should be drained at least:MonthlyDailyWeeklyBi-weekly20. The 20 lb range between the cut-in and cut-out of the governor serves to:Cool the compressorRemove impurities from the linesGive the system a pressure variationReduce condensation in the wet tank Your Name Time is Up!