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Virginia CDL Permit Test - Air Brakes

Number of questions: 25
Passing score: 20
Directions: 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 answer choices. To pass, the applicant must answer at least 20 questions correctly. Test questions come from the Virginia 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.
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Passing grade —
5 or fewer errors
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1.
Air storage tanks:
Are not allowed on a vehicle.
Hold compressed air for the brakes.
Should be drained of excess air after every trip.
2.
The air storage tanks:
Hold only enough air for one braking cycle.
Hold enough air for the brakes to be used several times if the compressor stops working.
Do not hold air unless there is an emergency.
3.
The air compressor is connected to the:
Transmission.
Engine.
Radiator.
4.
Do not operate a vehicle if any brake drums have cracks that are larger than ____ of the width of the friction area.
One half
One third
One fifth
5.
When an S-cam turns inside a brake drum, the S-cam:
Presses the brake shoes against the inside of the brake drum.
Presses the brake shoes against the brake linings.
Presses the brake linings against the wheel axles.
6.
Air tank drains should:
Only be used by mechanics.
Only be used when it is wet outside.
Be used to drain the tanks completely.
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