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CDL Air Brakes Practice Test 4

By Dave Evangelisti / March 20, 2023

Time limit: 0

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Question 1 of 10

1. Question
Which device allows you to remove oil and water from the air brake systems?
- a. Air tank drain
- b. Safety valve
- c. Alcohol evaporator
- d. Treadle valve
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Question 2 of 10

2. Question
What does it mean when the safety valve opens and releases air?
- a. The pressure has exceeded 150 psi
- b. The system is fully charged
- c. Something is wrong, and a mechanic needs to check it
- d. A and C
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Question 3 of 10

3. Question
What should the air pressure loss be in a single vehicle with a fully charged air system?
- a. Less than 2 psi per minute
- b. Less than 3 psi per minute
- c. Less than 4 psi per minute
- d. Less than 5 psi per minute
Correct

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Question 4 of 10

4. Question
In a combination vehicle, what should the air pressure loss be with a fully charged air system?
- a. Less than 2 psi per minute
- b. Less than 3 psi per minute
- c. Less than 4 psi per minute
- d. Less than 5 psi per minute
Correct

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Question 5 of 10

5. Question
Where is compressed air stored?
- a. Air compressor
- b. Pressure gauge
- d. Main reservoirs
- d. Service and emergency air lines
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Question 6 of 10

6. Question
Which of the following devices indicates how much air pressure you are applying to your brakes?
- a. Application pressure gauge
- b. Low air pressure warning signal
- c. Governor
- d. Supply pressure gauge
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Question 7 of 10

7. Question
Which of the following devices can be used as the low air pressure warning signal?
- a. A buzzer
- b. Red warning light
- c. A mechanical arm (wig wag)
- d. Any of the above
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Question 8 of 10

8. Question
What is a wig-wag?
- a. A device that cuts the normal air pressure to the front brakes by half
- b. A mechanical arm that comes into view when the air pressure falls below 60 psi
- c. Another name for a brake pedal
- d. A lever used to apply the spring brakes gradually
Correct

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Question 9 of 10

9. Question
What is a modulating control valve?
- a. A device that controls when the air compressor will pump air into the air storage tanks.
- b. A device that cuts the normal air pressure to the front brakes by half.
- c. A valve used to drain oil and water from the air storage tanks.
- d. A lever used to apply the spring brakes gradually
Correct

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Question 10 of 10

10. Question
What does the Air Compressor Governor control?
- a. When the air is released from the tank
- b. When air pressure is cut to the front brakes
- c. When the air compressor pumps air into the storage tanks
- d. When water and oil are automatically expelled from the storage tanks
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