CDL AIR BRAKES

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Author:
RalphFolarin
ID:
190920
Filename:
CDL AIR BRAKES
Updated:
2012-12-30 17:43:53
Tags:
CDL
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Description:
CDL AIR BRAKES
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  1. Why must air tanks be drained?

    A. To drain all the air out of the tank.
    B. To keep anyone from moving the vehicle.
    C. To drain moisture and oil out of the tank.
    C. To drain moisture and oil out of the tank.
    (this multiple choice question has been scrambled)
  2. What is a supply pressure gauge used for?

    A. To tell you how much diesel is in the vehicle.
    B. To tell you how much air is in the air tanks.
    C. To tell you how much water is in the air tank.
    B. To tell you how much air is in the air tanks.
    (this multiple choice question has been scrambled)
  3. All vehicles with air brakes must have a low air pressure warning signal.

    A. True
    B. False
    A. True
  4. What are spring brakes?

    A. Brakes used for parking.
    B. The spring on the brake pedal.
    C. If the airbrakes leak down, springs press the brakes on to stop the vehicle.
    C. If the airbrakes leak down, springs press the brakes on to stop the vehicle.
    (this multiple choice question has been scrambled)
  5. Front wheel brakes are good under all conditions.

    A. True
    B. False
    A. True
  6. When you apply your brakes, the air brake system works with an electric switch, by air pressure, to turn on the brake lights.

    A. True
    B. False
    A. True
  7. What do air brakes use to make the brakes work?

    A. Compressed oil
    B. Compressed air
    C. Compressed gas
    B. Compressed air
    (this multiple choice question has been scrambled)
  8. Air brakes are really three different braking systems: service brake, parking brake and emergency brake.

    A. True
    B. False
    A. True
  9. The service brake applies and releases:

    A. The parking brake when you use the parking brake control.
    B. In the event of an emergency.
    C. The brake when you use the brake pedal during normal driving.
    C. The brake when you use the brake pedal during normal driving.
    (this multiple choice question has been scrambled)
  10. The parking brake applies and releases:

    A. The parking brakes when you use the parking brake control.
    B. The brake pedal during normal driving.
    C. In the event of an emergency.
    A. The parking brakes when you use the parking brake control
    (this multiple choice question has been scrambled)
  11. The emergency brake system:

    A. Uses the parking brake to stop the vehicle in the event of a brake system failure.
    B. Uses parts of the service and parking brake system to stop the vehicle in the event of a brake system failure.
    C. Uses the service brake to stop the vehicle in the event of a brake system failure.
    B. Uses parts of the service and parking brake system to stop the vehicle in the event of a brake system failure.
    (this multiple choice question has been scrambled)
  12. The governor controls when the air compressor will pump into the air storage tanks.

    A. True
    B. False
    A. True
  13. The air storage tanks are used to hold compressed air.

    A. True
    B. False
    A. True
  14. When you put on the brakes by pushing down the brake pedal:

    A. The air pressure is reduced to the brake pads.
    B. Compressed air is let go out of the system.
    C. Air pressure is applied to the brake pads.
    C. Air pressure is applied to the brake pads.
    (this multiple choice question has been scrambled)
  15. The S-cam forces the brake shoes away from one another and presses them against the inside of the brake drum. It is called the S-cam because:

    A. It is shaped like the letter N.
    B. It is shaped like the letter S.
    C. It is shaped like the letter Z.
    B. It is shaped like the letter S.
    (this multiple choice question has been scrambled)
  16. The air compressor is connected to the engine through:

    A. V Belt
    B. Gears
    C. Hoses
    D. Both A and C
    D. Both A and C
    (this multiple choice question has been scrambled)
  17. The Air Compressor Governor controls:

    A. When the air is released from the tank
    B. When the warning light is activated
    C. When the brakes should be applied
    D. When the air compressor pumps air into the storage tanks
    D. When the air compressor pumps air into the storage tanks
    (this multiple choice question has been scrambled)
  18. Compressed air is stored:

    A. In the engine compartment
    B. In the hoses
    C. In the storage tank
    D. In the fuel tank
    C. In the storage tank
    (this multiple choice question has been scrambled)
  19. The Governor stops pumping air when it reaches the "cut out" level, or around:

    A. 125 psi
    B. 225 psi
    C. 200 psi
    D. 175 psi
    A. 125 psi
    (this multiple choice question has been scrambled)
  20. The Governor allows the air to start pumping again when it reaches the cut in level, or around:

    A. 125 psi
    B. 100 psi
    C. 200 psi
    D. 150 psi
    B. 100 psi
    (this multiple choice question has been scrambled)
  21. An air tank is equipped with a drain valve to remove:

    A. Oil and air
    B. Air and water
    C. Water and oil
    D. Dirt and oil
    C. Water and oil
    (this multiple choice question has been scrambled)
  22. Some air brake systems have an alcohol evaporator which helps:

    A. Reduce the risk of ice in the air brake valves during cold weather
    B. Reduce the risk of water in the air brake valves in warm weather
    C. Remove oil from the air lines
    D. Remove fuel from the air lines
    A. Reduce the risk of ice in the air brake valves during cold weather
    (this multiple choice question has been scrambled)
  23. The air tank should be drained how often?

    A. Every two or three days
    B. Every four hours
    C. Once a week
    D. Once a day
    D. Once a day
    (this multiple choice question has been scrambled)
  24. The safety valve in the air compressor tank is set to open at:

    A. 175 psi
    B. 200 psi
    C. 100 psi
    D. 150 psi
    D. 150 psi
    (this multiple choice question has been scrambled)
  25. When the safety valve releases air it means that:

    A. The pressure has exceeded 150 psi
    B. Too much air is in the air compressor
    C. Something is wrong, and you should have it checked by a mechanic
    D. All of the above
    D. All of the above
  26. When you apply pressure to the brake pedal, you are:

    A. Releasing air pressure to the brakes
    B. Pushing against a spring and against air pressure to the brakes
    C. Activating the safety valve
    D. Reducing air in the tanks
    B. Pushing against a spring and against air pressure to the brakes
    (this multiple choice question has been scrambled)
  27. Brake drums:

    A. Are bolted to the wheels
    B. Are located at each end of the vehicle's axles
    C. Hold the brake shoes and linings
    D. All of the above
    D. All of the above
  28. Which type of brake is the most common in commercial vehicles?

    A. Drum brakes
    B. Disk brakes
    C. S Cam brakes
    D. Wedge brakes
    C. S Cam brakes
    (this multiple choice question has been scrambled)
  29. An air pressure gauge:

    A. Shows how much pressure you are applying to the brakes
    B. Is connected to the generator
    C. Prevents brake failure
    D. Releases air when you accelerate
    A. Shows how much pressure you are applying to the brakes
    (this multiple choice question has been scrambled)
  30. All vehicles with air bakes are required to have a low pressure warning signal. This could be:

    A. A red light
    B. A wig wag mechanical arm
    C. A buzzer
    D. Any one of the above
    D. Any one of the above
  31. When the low pressure warning is activated, you should:

    A. Monitor your air pressure gauge and maintain highway speeds
    B. Bring the vehicle to a safe stop while you still control the brakes
    C. Pump the brake pedal hard to stop
    D. Wait for the air brakes to come on automatically
    B. Bring the vehicle to a safe stop while you still control the brakes
    (this multiple choice question has been scrambled)
  32. A dual air brake system:

    A. Has two air brake systems and one set of controls
    B. Must have two warning alarms
    C. Has one set of air tanks and hoses
    D. Takes less time to build air pressure
    A. Has two air brake systems and one set of controls
    (this multiple choice question has been scrambled)
  33. An emergency brake:

    A. Is required on commercial vehicles
    B. Must be held on by mechanical force
    C. Could be activated by the loss of air pressure
    D. All of the above
    D. All of the above
  34. To check the slack adjusters on S Cam brakes, you should:

    A. Drain the air from the system and pull on the slack adjusters
    B. Wear gloves and pull hard on each slack adjuster
    C. Make sure the slack adjusters move more than one inch each way
    D. Leave the parking brakes on and pull on the slack adjuster
    B. Wear gloves and pull hard on each slack adjuster
    (this multiple choice question has been scrambled)
  35. To test the low pressure warning signal, you should do all BUT the following:

    A. Ask a friend to listen for the signal
    B. Step on and off the brake pedal to reduce air pressure
    C. Shut the engine off
    D. Turn the electrical power on
    A. Ask a friend to listen for the signal
    (this multiple choice question has been scrambled)
  36. With dual air systems, the air pressure should build:

    A. From 70 to 100 psi in 60 seconds
    B. From 70 to 150 psi in 60 seconds
    C. From 85 to 100 psi in 45 seconds
    D. From 85 to 150 psi in 45 seconds
    C. From 85 to 100 psi in 45 seconds
    (this multiple choice question has been scrambled)
  37. A fully charged air system typically has ____ psi:

    A. 125
    B. 175
    C. 100
    D. 150
    A. 125
    (this multiple choice question has been scrambled)
  38. To test air leakage rate you should:

    A. Charge the air system and leave the engine running
    B. Turn off the engine and release the service brake
    C. Depress the brake pedal and monitor the air pressure gauge
    D. Leave the engine running and release the service brake
    B. Turn off the engine and release the service brake
    (this multiple choice question has been scrambled)
  39. A combination vehicle air brake system should not lose air faster than:

    A. 3 psi per 30 seconds
    B. 4 psi per minute
    C. 3 psi per minute
    D. 2 psi per minute
    C. 3 psi per minute
    (this multiple choice question has been scrambled)
  40. To check the air compressor governor "cut in" and "cut out" pressures:

    A. Run the engine at a fast idle
    B. Step on and off the brake to reduce tank pressure
    C. Monitor the air pressure gauge
    D. All of the above
    D. All of the above
  41. To test your service brakes you should:

    A. Put parking brake on and release air pressure
    B. Depress brakes when traveling at highway speeds
    C. Release the parking brake, move forward slowly and depress brakes
    D. Stop the vehicle and put the parking brake on
    C. Release the parking brake, move forward slowly and depress brakes
    (this multiple choice question has been scrambled)
  42. Stab braking occurs when you:

    A. Press on the brake pedal as hard as you can
    B. Release the brakes when the wheels lock up
    C. Apply the brakes when the wheels start rolling
    D. All of the above
    D. All of the above
  43. Air brakes take longer to stop than hydraulic brakes because:

    A. The linings get hotter more quickly
    B. The reaction time is longer for the driver
    C. It takes longer for the air to flow through the lines
    D. None of the above
    C. It takes longer for the air to flow through the lines
    (this multiple choice question has been scrambled)
  44. The proper way to go down long grades is to:

    A. Brake on and off down the hill
    B. Use a low gear and push hard on the brakes
    C. Let up on the brakes from time to time to cool them
    D. Use a low gear and apply light pressure on the brakes
    D. Use a low gear and apply light pressure on the brakes
    (this multiple choice question has been scrambled)
  45. You should use the parking brake:

    A. On level surfaces
    B. Only on steep hills
    C. Any time you park
    D. When the brakes are hot
    C. Any time you park
    (this multiple choice question has been scrambled)

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