Welcome to the Air Brake Quiz 1. Responsibility for ensuring that the braking system is operational finally rests with the:DriverCompany mechanicMaintenance crewCompany or owner2. 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 adjusted3. 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 pressureIt saves wear on the compressorIt keeps dirt and water out of the linesThe brake circuit becomes a back-up air tank4. If the brakes are out of adjustment, the force of the spring brakes when applied will be:GreaterThe sameLessVariable5. In a 105 PSI system, the governor will cause the compressor to return to its pumping stage at a pressure of:65 PSI85 PSI105 PSI95 PSI6. Reservoirs should be drained at least:Bi-weeklyMonthlyDailyWeekly7. The foot valve:Automatically adjusts to braking requirementsNeeds reservoir pressure to control it to within 10 PSIContinuously maintain applied pressure when in useShould be used instead of the hand valve8. If your brakes do not seem to be holding even when air pressure is sufficient, you should:Continue normally, as long as you have some braking powerTravel at a reduced speedStop, check the brakes and make adjustmentsReport the condition at the end of the trip9. The main purpose of the hand valve is to:Control the amount of application air directed to the trailer brakesSupplement the other braking systemAct as an emergency brake if the foot valve failsControl the amount of application air directed to the tractor brakes10. To stop a vehicle, the energy of motion is turned into:Heat in the brake lining and drumsMoisture in the reservoirsFrictionTraction11. The final factor in determining if a vehicle will move is the amount of:FrictionInertiaTractionPower12. The weight of a vehicle is doubled. To stop in the same distance, the braking power must be increased:6 times4 times2 times8 times13. When a compressor discharge line is broken, total loss of air is prevented by the:Two-way check valveGovernor valveOne-way check valveRelay valve14. The low pressure warning device activates at:85 PSI40 PSI60 PSI50 PSI15. 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 chambersBe less than the reservoir pressureBe the same as the reservoir pressureBe greater than reservoir pressure16. In a dual circuit air system, air from the primary and secondary air reservoirs is directed to:The front wheel limiting valveThe one-way check valveThe foot valveThe relay valve17. When necessary, a driver should use the manual front wheel limiting valve on slippery roads:To reduce the brake application pressure by 50 percentTo cut out the front wheel brakesInstead of the hand valveTo reduce the brake application by 25 percent18. 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 tank19. In a dual circuit air system, the valve that protects the primary circuit from air loss in the secondary circuit is the:Limiting valveTwo-way check valveEmergency relay valveDual circuit foot valve20. A tug test on the trailer brakes should be done with the:Hand valve appliedParking brake and hand valve appliedParking brake appliedFoot valve applied Your Name Time is Up!