Air Brake Examination PDF

1. Brakes convert the energy of a moving vehicle info: ANS. C a. Water b. Compressed air c. Heat. d. Noise 2. Air compressors are powered directly by the engine or by using ANS. A a. Belts and pulleys. b. Brackets and supports c. Chains and sprockets...

1. Brakes convert the energy of a moving vehicle info: ANS. C a. Water b. Compressed air c. Heat. d. Noise 2. Air compressors are powered directly by the engine or by using ANS. A a. Belts and pulleys. b. Brackets and supports c. Chains and sprockets d. Belts and chains 3. The compressed air in an air brake system is stored in: ANS. A a. The vehicle’s air tanks b. The air compressor governor c. The brake chambers d. The air lines and valves 4. Alcohol evaporators may be used to: ANS. C a. Add water to the air brake system to prevent freezing b. Heat the air brake system to help prevent freezing. c. Help prevent moisture in the air brake system from freezing d. Remove water vapor from the air brake system 5. When a spring brake chamber has been disabled by a “caging bolt” or other mechanism: ANS. D a. It looks the same to a driver b. The spring brake will still apply c. The service brake will not apply d. The spring brake will not apply 6. Trailer couplers or ‘gladhands’ are usually: ANS. D a. Painted the same colour as the vehicle b. Cross-connected when colours are matched c. Yellow and black to avoid cross-connection d. Colour matched and designed to prevent cross-connection 7. Wedge brakes components include: ANS. A a. Brake drums and brake shoes b. Camshafts and brake calipers c. Rotors and brake drums  d. Calipers and rotors 8. Brake fade can result in: ANS. A a. High brake temperatures b. High air compressor temperature c. High air brake system pressure d. Driving at high altitudes 9. Anti-lock braking systems (ABS) use waring indicator lights to indicate: ANS. B a. The system temperature b. Malfunctions of the system c. Wheel skidding d. None of the above 10. When a vehicle’s brakes do not comply with the Ontario Highway Traffic Act and regulations: ANS. D a. Only the driver may be charged. b. Only the vehicle operator may be charged c. The driver will not be charged d. Both the vehicle operator and the driver may be charged 11. Driver must be careful when conducting an inspection of the air brake system to avoid: ANS. D a. Unexpected vehicle movement b. Compressed air exhausting from components c. Moving vehicle parts d. All the above 12. When inspecting brake drums and rotors, the driver must look for: ANS. B a. Brake calipers or rotors that are not the same colour b. Broken or cracked brake drums or rotors c. Brake drums or shoes that are not the correct size d. Square ports and markings 13. When inspecting the air compressor, the driver must look for: ANS. A a. Insecure mounting bracket or fasteners b. Improper governor setting c. Loose air tank brackets or fasteners d. All of the above 14. An air compressor governor should cut-in approximately 20 to 25 psi ANS. A  a. Below cut-out pressure setting b. Above cut-in pressure setting c. Above cut-out pressure setting d. Below cut-in pressure setting 15. The air loss rate on a single vehicle (bus, tractor or truck) must not exceed: ANS. A a. 3 psi per minute b. 6 psi per minute c. 8 psi per minute d. 1 psi per minute 16. When an air brake system contains a major defect you must: ANS. D a. Drive the vehicle slowly on the highway b. Drive the vehicle to the nearest service station c. Drive the vehicle back to the terminal d. Not drive or operate the vehicle on any road or highway 17. A reliable method for inspecting brake adjustment on a brake having an exposed pushrod is: ANS. A a. Measuring the applied pushrod stroke b. Checking air pressure drop on brake application c. Checking for a 90-degree angle when brakes are applied d. Rolling the vehicle forward and applying the brakes 18. When measuring the applied pushrod stroke on brakes having exposed pushrods, air pressure must be between: ANS. B a. 100 and 120 psi b. 90 and 100 psi c. 100 and 135 psi d. 60 and 120 psi 19. A brake having an exposed pushrod is out of adjustment when: ANS. A a. The pushrod stroke exceeds the adjustment limit of the brake chamber b. The angle between the slack adjuster and pushrod is less than 90 degrees c. The angle between the slack adjuster and pushrod is more than 90 degrees d. Air pressure drops more than 8 psi when brakes are applied. 20. Repair and re-adjustment of all types of air brakes may be performed by: ANS. C a. Licensed drivers b. Certified drivers c. Certified technicians  d. Drivers with a valid air brake endorsement 21. Hydraulic brake systems use: ANS. D a. Steam b. Compressed air c. Water d. Brake fluid 22. Air compressors are mounted directly onto the engine or by using: ANS. B a. Pulleys b. Brackets and fasteners c. Sprockets d. Belts and chains 23. Air tanks must be drained regularly because: ANS. A a. This is where moisture and oil collect b. Tanks will develop too much pressure c. Tanks will overheat d. This is where primary and secondary air collect 24. The brake pedal in an air brake system is used to: ANS. C a. Apply vehicle spring bakes b. Raise and lower air brake system pressure c. Apply vehicle service brakes d. Apply trailer service brakes only 25. A spring brake control valve is normally: ANS. D a. Located in the same position in all commercial vehicles b. Pulled to release and pushed to apply the service brakes c. A toggle-type valve located in the same position in all vehicles d. A push/pull type valve located near the driver 26. When trailer couplers or ‘gladhands’ are cross-connected: ANS. C a. Trailer service and spring brakes will function correctly b. The trailer spring brakes will release and function correctly c. Trailer service and spring brakes will not function correctly d. Trailer service brakes will function correctly 27. A vehicle’s brakes must do more work when: ANS. C a. The vehicle carries less weight b. The vehicle goes slower  c. The vehicle carries more weight d. All of the above 28. When brake chamber pushrod stroke exceeds the adjustment limit: ANS. D a. The spring brakes will still work normally b. Vehicle stopping distances become shorter c. Vehicle braking capacity will increase d. Braking ability is reduced 29. Air brake systems must comply with the Ontario Highway Traffic Act and regulations: ANS. D a. Only when the vehicle is being tested b. Only during an annual safety inspection c. Only when they are inspected by enforcement personnel d. At all times when being driven or operated on any road or highway 30. When conducting an inspection of the air brake system, the vehicle should be parked securely on a: ANS. D a. Hill with the wheels turned toward the curb b. Level surface and in any location c. Hill with the wheels turned away for the curb d. Level surface and in a safe location 31. When inspecting the foundation brake components, the driver must look for: ANS. D a. Brake lining that is not against the drum when brakes are applied b. Brake lining that is too thin or cracked c. Grease or oil on the brake lining d. All of the above 32. When inspecting visible air brake hoses and tubes, the driver must check for: ANS. D a. Audible air leak b. Damaged or worn air line c. Improper fitting used to connect or repair an air line d. All of the above 33. To test the low air warning device, the ignition switch must be turned on and air pressure must be: ANS. C a. Raised from the normal operating range until the device activates b. Raised from zero until the device de-activates. c. Reduced from the normal operating range until the device activates  d. Reduced from 60 psi until the device de-activates 34. Air compressor cut-in pressure must never be less than: ANS. C a. 60 psi b. 120 psi c. 80 psi d. 135 psi 35. Drivers who are certified to re-adjust air brakes may do so: ANS. B a. All commercial vehicles b. Vehicles with manual slack adjusters c. Vehicles with automatic slack adjusters d. Trucks, tractors and buses only 36. The brake system on most large commercial vehicles use: ANS. A a. Compressed air to apply the brakes b. Steam to apply the brakes c. Water to apply the brakes d. Brake fluid to apply the brakes 37. The governor controls air compressor: ANS. C a. Temperature b. Speed and pressure c. Cut-in and cut-out pressures d. Temperature and speed 38. To check the air pressure in a vehicle’s air brake system, a driver: ANS. A a. Reads the gauges on the instrument panel b. Makes a full brake application c. Operates the engine at fast idle d. Waits for governor cut-out 39. Manually-operated front wheel limiting valves are: ANS. A a. Used to reduce the for e of the service brakes on the front steering axle b. Only found on new vehicles to disable front steering axle brakes c. Used to limit the number of times that brakes can be applied d. Used to reduce the brake force on trailer axle brakes 40. When air brake system pressure drops below 60 psi the spring brakes: ANS. B a. Will automatically release b. Will automatically apply  c. Must be manually applied d. Must be manually released 41. The trailer had valve is used to: ANS. D a. Release the trailer spring brakes b. Apply the trailer spring brakes c. Release the towing vehicle spring brakes d. Apply the trailer service brakes 42. A vehicle’s brakes must do more work when: ANS. B a. The vehicle goes slower b. The vehicle goes faster c. The vehicle carries less weight d. None of the above 43. Using anti-lock braking system (ABS) to prevent the wheels from locking: ANS. B a. Causes the brakes to go out of adjustment more easily b. Helps maintain steering control during emergency braking c. Causes poor steering and directional stability in all driving situations d. Can cause loss of steering control 44. Anti-lock braking systems (ABS) use waring indicator lights to indicate: ANS. B a. The system temperature b. Malfunction of the system c. Wheel skidding d. None of the above 45. To prevent vehicle movement during an inspection of the air brake system, a driver should use: ANS. C a. The service brakes b. The spring brakes c. Wheel chocks or blocks d. The brake pedal 46. When inspecting the brake chambers, the driver must look for: ANS. D a. Air leaks, cracks and manufactured holes b. Manufactured air leaks and cracks c. Contaminated brake lining d. Air leaks, cracks and non-manufactured holes 47. The low air warning device must activate before air pressure drops to: ANS. C  a. 90 psi b. 75 psi c. 55 psi d. 45 psi 48. A properly functioning air brake system: ANS. D a. Will lose air at a noticeable rate b. Has many noticeable air leaks c. Will lose air at a noticeable rate when the engine is not running d. Should not have any noticeable air leaks 49. When air brakes are applied or released, the brakes will respond: ANS. A a. After a split-second delay b. Directly and immediately c. Slower at slow speed d. Faster at high speed 50. The normal operating pressure range for air brake systems is: ANS. D a. 60 to 120 psi b. 0 to 150 psi c. 120 to 135 psi d. 100 to 120 psi 51. Vehicles with air brakes must have air pressure gauges that indicated the pressure in the: ANS. D a. Brake chambers b. Air compressor c. Air compressor governor d. Primary and secondary air tanks 52. Air brake chamber pushrod stroke is the result of: ANS. C a. Moisture entering the air tanks b. Compressed air entering the air tanks c. Compressed air entering the brake chamber d. Brakes that are out of adjustment 53. When a vehicle’s service brakes fail to apply, emergency brakes can be applied by using the: ANS. B a. Brake pedal b. Spring brake control valve c. Tractor protection valve  d. Trailer hand valve 54. A trailer supply valve is usually: ANS. D a. Located in the same position in all commercial vehicles b. Pulled to release spring braes and pushed to apply service brakes c. A toggle-type valve that supplies air to the trailer and is located in the same position on all vehicles d. A push/pull type valve located near the driver that supplies air to the trailer 55. When inspecting the brake chambers on each side of a steering axle, the driver must ensure that slack adjusters are: ANS. A a. The same effective length and brake chambers are the same size b. The same effective length and brake chambers are not the same size c. Not the same effective length and brake chambers are the same size d. Not the same size and brake chambers are not the same effective length 56. To test air pressure build-up time, the engine must be running at: ANS. B a. 400 to 500 rpm b. 600 to 900 rpm c. 2000 to 2100 rpm d. 1000 to 1500 rpm 57. To the tractor protection valve, the driver must check for air exhausting from the: ANS. C a. Trailer supply line with the trailer air supply valve open (pushed in) b. Trailer supply line with the trailer air supply valve closed (pulled out) c. Trailer service line with the trailer supply valve closed (pulled out) d. Trailer service line with the trailer supply valve open (pushed in) 58. Drivers who are certified to re-adjust air brakes may do so on: ANS. B a. All commercial vehicles b. Vehicles with manual slack adjusters c. Vehicles with automatic slack adjusters d. Trucks, tractors and buses only 59. The type of air brake components on most large commercial vehicles are either: ANS. D a. Drum or hydraulic brakes b. Air or disc brakes c. Wet or dry brakes d. Drum or disc brakes 60. Safety valves prevent: ANS. C a. Overheating of the air tanks b. Draining of the air tanks c. Overpressure of the air brake system d. All of the above 61. Each air brake chamber style, type and size has a specific: ANS. B a. Colour b. Adjustment limit c. Mounting position d. All of the above 62. High brake temperatures can result from: ANS. D a. Repeated brake use driving down a long or steep hill b. Repeated brake use in stop and go traffic c. Severe braking d. All of the above 63. When testing air pressure build-up time, pressure must build from 85 to 100 within: ANS. C a. 1 minute b. 3 minutes c. 2 minutes d. 4 minutes 64. A tractor protection valve is defective if the trailer supply valve is closed (pulled out) and air exhausts from the: ANS. A a. Trailer service line with the brae pedal pressed b. Trailer supply line with the brake pedal pressed c. Trailer service line with the brake pedal released d. Trailer supply line with brake pedal released 65. Spring brake chambers: ANS. A a. Are larger than service brake chambers b. Are smaller than service brake chambers c. Always have square ports d. Are less likely to be out of adjustment than service brake chambers 66. The air brake system on a trailer includes: ANS. D a. Air tanks and air compressors b. Air tanks and automatic evaporator valves  c. Wet and dry air tanks d. Air tanks and automatic spring brake application 67. Brake fade can result from: ANS. A a. High brake temperatures b. High air compressor temperature c. High air brake system pressure d. Driving at high altitudes 68. When inspecting the air compressor, the driver must look for: ANS. A a. Insecure mounting bracket or fasteners b. Improper governor setting c. Loose air tank brackets or fasteners d. All of the above 69. Trailer spring brakes must apply automatically when the: ANS. C a. Trailer supply valve is opened (pushed in) b. Spring brake valve is opened (pushed in) c. Trailer supply valve is closed (pulled out) d. Trailer hand valve is released 70. Air compressors: ANS. C a. Are filled with brake fluid b. Generate heat to stop a vehicle c. Force air into a smaller space d. All of the above 71. Air tanks must be drained regularly because: ANS. A a. This is where moisture and oil collect b. Tanks will develop too much pressure c. Tanks will overheat d. This is where primary and secondary air collect 72. An air dryer removes moisture, which is expelled when the: ANS. C a. Low air warning device activates b. Driver applies the service brakes c. Compressor reaches cut-out pressure d. Spring brakes are applied 73. Trailer couplers or ‘gladhands’ are used to connect the: ANS. B a. Towing vehicle supply line to the trailer service line  b. Towing vehicle air brake system to the trailer air brake system c. Towing vehicle service line to the trailer supply line d. Lights on the trailer to the towing vehicle 74. A trailer with ‘spring brake’ priority allows the trailer spring brakes to release before: ANS. B a. Towing vehicle service brakes will operate b. Trailer service brakes will operate c. Trailer spring brakes will release d. Trailer service brakes will release 75. To test the spring brakes, the driver should apply them and attempt to move the vehicle by: ANS. B a. Applying full engine power in a high gear b. Applying engine power gently in a low gear c. Applying the service brakes in any gear d. Releasing the spring brakes in any gear 76. If a vehicle moves while the spring brakes are applied, the vehicle has: ANS. A a. Defective spring brakes b. Properly adjusted service brakes c. A defective brake pedal d. Properly adjusted spring brakes 77. ‘S’ cam brake components include: ANS. C a. Rotors and brake drums b. Camshafts and brake calipers c. Camshafts and brake shoes d. Calipers and rotors 78. Disc brake components include: ANS. D a. Rotors and brake drums b. Camshafts and brake calipers c. Camshafts and brake shoes d. Calipers and rotors 79. Wedge brake components include: ANS. A a. Brake drums and brake shoes b. Camshafts and brake calipers c. Rotors and brake drums  d. Calipers and rotors 80. An air tank drain valve that fails to function: ANS. B a. Is a normal condition of the air brake system b. Is a defect of the air brake system c. Indicates a defective air compressor governor d. Indicates a defective brake pedal