2026 Free Arizona DMV Class B Air Brakes Test 1 (25 Questions And Complete Answers)
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An alcohol evaporator is especially important:
1. In cold weather.
2. In hot weather.
3. In dry weather.
1. In cold weather.
2. In hot weather.
3. In dry weather.
In cold weather.
A safety valve is set to open at ____ pounds per square inch (psi).
1. 100
2. 150
3. 200
1. 100
2. 150
3. 200
150
An application pressure gauge shows:'
1. How much air pressure is being applied to the brakes.
2. How much air pressure is available.
3. How much air pressure is required to stop a vehicle.
1. How much air pressure is being applied to the brakes.
2. How much air pressure is available.
3. How much air pressure is required to stop a vehicle.
How much air pressure is being applied to the brakes.
'4. Friction in an S-cam brake is caused when the brake shoes and linings:
1. Press against the outside of the brake drum.
2. Press against the inside of the brake drum.
3. Push against each other.
1. Press against the outside of the brake drum.
2. Press against the inside of the brake drum.
3. Push against each other.
Press against the inside of the brake drum.
5'. Do not operate a vehicle if any brake drums have cracks that are larger than ____ of the width of the friction area.
1. One half
2. One third
3. One fifth
1. One half
2. One third
3. One fifth
One half
6'. If air pressure drops to a level between ____, a visual low pressure warning signal should have already activated.
1. 55 and 75 psi.
2. 80 and 95 psi.
3. 65 and 100 psi.
1. 55 and 75 psi.
2. 80 and 95 psi.
3. 65 and 100 psi.
55 and 75 psi.
'7. How much distance will an air brake-equipped vehicle need to come to a complete stop if it is traveling at 55 mph under ideal driving conditions?
1. 300 feet
2. 100 feet
3. 450 feet
1. 300 feet
2. 100 feet
3. 450 feet
450 feet
Why should you regularly drain the air tanks?
1. Because compressed air contains some water and the water collects in the tanks
2. Because the air gets old and needs to be replaced
3. To allow for a change in pressure
1. Because compressed air contains some water and the water collects in the tanks
2. Because the air gets old and needs to be replaced
3. To allow for a change in pressure
Because compressed air contains some water and the water collects in the tanks
If the safety relief valve in the air brake system releases air:
1. The compressor needs more air.
2. There is something wrong with the brakes.
3. You may continue driving.
1. The compressor needs more air.
2. There is something wrong with the brakes.
3. You may continue driving.
There is something wrong with the brakes.
A low air pressure warning signal should activate:
1. When tank pressure falls below 120 psi.
2. When tank pressure falls below 60 psi.
3. When tank pressure falls below 10 psi.
4. When tank pressure falls below 5 psi.
1. When tank pressure falls below 120 psi.
2. When tank pressure falls below 60 psi.
3. When tank pressure falls below 10 psi.
4. When tank pressure falls below 5 psi.
When tank pressure falls below 60 psi.
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