Commercial Drivers' License (CDL) Information
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Air Brakes Sample Test G

1. The air compressor is connected to the engine through:
A Gears
B Hoses
C V Belt
D Both A and B

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. Compressed air is stored:
A In the hoses
B In the engine compartment
C In the fuel tank
D In the storage tank

4. 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

5. 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

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. 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

8. 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

9. 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

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

Score =
Correct answers:






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