1.The safety valve in the air compressor tank is set to open at:

A. 150 psi
B. 200 psi
C. 100 psi
D. 175 psi

2.The Air Compressor Governor controls:

A. When the brakes should be applied
B. When the air compressor pumps air into the storage tanks
C. When the warning light is activated
D. When the air is released from the tank

3.The Governor stops pumping air when it reaches the "cut out" level, or around:

A. 125 psi
B. 200 psi
C. 225 psi
D. 175 psi

4.The Governor allows the air to start pumping again when it reaches the cut in level, or around:

A. 200 psi
B. 100 psi
C. 150 psi
D. 125 psi

5.You should use the parking brake:

A. Only on steep hills
B. On level surfaces
C. Any time you park
D. When the brakes are hot

6.An air tank is equipped with a drain valve to remove:

A. Air and water
B. Oil and air
C. Water and oil
D. Dirt and oil

7.The air compressor is connected to the engine through:

A. Gears
B. Hoses
C. V Belt
D. Both A and B

8.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. Remove oil from the air lines
C. Reduce the risk of water in the air brake valves in warm weather
D. Remove fuel from the air lines

9.The air tank should be drained how often?

A. Once a week
B. Once a day
C. Every four hours
D. Every two or three days

10.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

11.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

12.Which type of brake is the most common in commercial vehicles?

A. Wedge brakes
B. Disk brakes
C. S Cam brakes
D. Drum brakes

13.An air pressure gauge:

A. Shows how much pressure you are applying to the brakes
B. Is connected to the generator
C. Releases air when you accelerate
D. Prevents brake failure

14.When you apply pressure to the brake pedal, you are:

A. Pushing against a spring and against air pressure to the brakes
B. Releasing air pressure to the brakes
C. Reducing air in the tanks
D. Activating the safety valve

15.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

16.When the low pressure warning is activated, you should:

A. Wait for the air brakes to come on automatically
B. Bring the vehicle to a safe stop while you still control the brakes
C. Monitor your air pressure gauge and maintain highway speeds
D. Pump the brake pedal hard to stop

17.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

18.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

19.To check the slack adjusters on S Cam brakes, you should:

A. Leave the parking brakes on and pull on the slack adjuster
B. Wear gloves and pull hard on each slack adjuster
C. Make sure the slack adjusters move more than one inch each way
D. Drain the air from the system and pull on the slack adjusters

20.With dual air systems, the air pressure should build:

A. From 85 to 100 psi in 45 seconds
B. From 70 to 100 psi in 60 seconds
C. From 85 to 150 psi in 45 seconds
D. From 70 to 150 psi in 60 seconds

21.Compressed air is stored:

A. In the hoses
B. In the engine compartment
C. In the fuel tank
D. In the storage tank

22.A fully charged air system typically has ____ psi:

A. 100
B. 125
C. 150
D. 175

23.To test air leakage rate you should:

A. Leave the engine running and release the service brake
B. Turn off the engine and release the service brake
C. Charge the air system and leave the engine running
D. Depress the brake pedal and monitor the air pressure gauge

24.A combination vehicle air brake system should not lose air faster than:

A. 2 psi per minute
B. 3 psi per 30 seconds
C. 3 psi per minute
D. 4 psi per minute

25.To test your service brakes you should:

A. Stop the vehicle and put the parking brake on
B. Release the parking brake, move forward slowly and depress brakes
C. Put parking brake on and release air pressure
D. Depress brakes when traveling at highway speeds

26.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

27.A duel air brake system:

A. Has two air brake systems and one set of controls
B. Takes less time to build air pressure
C. Has one set of air tanks and hoses
D. Must have two warning alarms

28.Air brakes take longer to stop than hydraulic brakes because:

A. The reaction time is longer for the driver
B. It takes longer for the air to flow through the lines
C. The linings get hotter more quickly
D. None of the above

29.The proper way to go down long grades is to:

A. Use a low gear and push hard on the brakes
B. Let up on the brakes from time to time to cool them
C. Use a low gear and apply light pressure on the brakes
D. Brake on and off down the hill

30.To test the low pressure warning signal, you should do all BUT the following:

A. Shut the engine off
B. Turn the electrical power on
C. Ask a friend to listen for the signal
D. Step on and off the brake pedal to reduce air pressure


Correct answers (Prawidlowe odpowiedzi):

1. A
2. B
3. A
4. B
5. C
6. C
7. D
8. A
9. B
10. D
11. D
12. C
13. A
14. A
15. D
16. B
17. D
18. D
19. B
20. A
21. D
22. B
23. B
24. C
25. B
26. D
27. A
28. B
29. C
30. C


All tests are provided for informational and hypothetical purposes only. shall not be liable for any errors in the content.

Wszystkie testy zawarte na stronach maja jedynie charakter przykladowo - informacyjny. Nie jestesmy odpowiedzialni za ewentualne bledy w zawartosci merytorycznej testow.