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At what air pressure must the low air pressure warning signal come on?
Correct answer(s):
- 60 psi
Which of the following statements is true regarding front wheel braking?
Correct answer(s):
- Front wheel braking is good under all conditions
Which of the following is the most common type of foundation brake?
Correct answer(s):
- S-cam drum brake
What psi level is the safety relief valve set to open at?
Correct answer(s):
- 150 psi
What is the alcohol evaporator’s primary purpose?
Correct answer(s):
- Put alcohol into the air system
What is the name of the device that pumps air into the air storage tanks?
Correct answer(s):
- Air compressor
What are the three types of brake systems used in a commercial vehicle air brake system?
Correct answer(s):
- Service brake, parking brake, emergency brake
What type of air do air brakes use?
Correct answer(s):
- Compressed air
Which device allows you to remove oil and water from the air brake systems?
Correct answer(s):
- Air tank drain
What does it mean when the safety valve opens and releases air?
Correct answer(s):
- The pressure has exceeded 150 psi
- Something is wrong, and a mechanic needs to check it
What should the air pressure loss be in a single vehicle with a fully charged air system?
Correct answer(s):
- Less than 2 psi per minute
In a combination vehicle, what should the air pressure loss be with a fully charged air system?
Correct answer(s):
- Less than 3 psi per minute
Where is compressed air stored?
Correct answer(s):
- Main reservoirs
Which of the following devices indicates how much air pressure you are applying to your brakes?
Correct answer(s):
- Application pressure gauge
Which of the following devices can be used as the low air pressure warning signal?
Correct answer(s):
- Any of a buzzer, red warning light, or a mechanical arm (wig wag)
What is a wig-wag?
Correct answer(s):
- A mechanical arm that comes into view when the air pressure falls below 60 psi
What is a modulating control valve?
Correct answer(s):
- A lever used to apply the spring brakes gradually
What does the Air Compressor Governor control?
Correct answer(s):
- When the air compressor pumps air into the storage tanks
Dr. Linus Carl Pauling is the only person to have won two Nobel Prizes individually for:
Correct answer(s):
- Chemistry in 1954, peace prize in 1962
The committee of the Norwegian Parliament awards the prize for:
Correct answer(s):
- Peace