Air Brakes
This endorsement is required for driving a vehicle with air brakes. To receive this endorsement, applicants must pass a written test. The test consists of 25 multiple choice questions. Each question has three or four answer choices. To pass, the applicant must answer at least 20 questions correctly. Test questions come from the North Carolina Commercial Driver License Manual. Questions come from the chapter covering: Air Brakes. The Air Brakes endorsement may be used with the Class A, B or C CDL.
Number of Questions
25
Passing Score
20
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To Pass
0
Correct
0
Incorrect
0
16. When traveling down a steep downgrade, the best way to use your brakes is to:
Apply the brakes only near the bottom of the downgrade.
Ride the brakes all the way down the hill.
Apply consistent pressure to the brake pedal all the way down the hill.
Apply the brakes for a few seconds, then release the brakes for a few seconds. Continue to repeat these steps as you travel down the hill.
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17. When a brake pedal is pressed and the S-cam is turned, the S-cam:
Presses the brake shoes against the inside of the brake drum.
Releases air from the air tanks.
Presses the brake lining against the wheel.
Tightens the brake drum onto the axle.
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18. ____ make up the emergency brake system.
Parts of the parking and service brake systems
Only parts of the service brake system
Only parts of the parking brake system
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19. When traveling down a steep downgrade:
The vehicle should be continually downshifted in the place of using the brakes.
The vehicle should be driven on the shoulder.
Shift into a lower gear, then use brakes to supplement the braking effect of the engine.
The air brakes should be used.
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21. How is water and compressor oil removed from the bottom of an air storage tank?
A sponge is used to soak up the water and oil.
A drain valve is opened to remove the water and oil from the tank.
The water and oil are removed automatically as the brakes are used.
The water and oil are siphoned out of the tank.
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