DISTRICT OF COLUMBIA CDL AIR BRAKES PRACTICE TEST
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The air brakes endorsement applies to applicants who wish to drive a vehicle with air brakes in Class A, B, or C CDL. To drive a vehicle with air brakes, you must pass the air brake component of the District of Columbia CDL knowledge test. The DC CDL air brakes test consists of 25 questions, and you'll need at least 20 correct answers to pass (80%). The test covers the information found in the air brakes section of the District of Columbia CDL Manual. Take this DC CDL practice test now to prepare for the actual air brakes test!
1.
If stopped on a hill, how can you start moving without rolling back?
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Release the parking brake before you have applied enough engine power to keep from rolling back.
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Partly engage the clutch before you take your right foot off the brake, put on the parking brake if necessary.
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Press on the gas pedal, even if you have to roll back a little.
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None of the above.
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2.
Which of the following is a reason why air tanks must be drained?
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Your transmission fluid may drain out.
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Your brakes may fail due to the water freezing.
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The governor may stop the compressor from pumping air.
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Your battery fluid may drain out.
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3.
If you must make an emergency stop, you should:
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apply the brakes as hard as you can to lock them.
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brake in a way that will keep your vehicle in a straight line.
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use the hand brake before the brake pedal.
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None of the above.
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4.
Passive railroad crossings:
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have at least one traffic control device.
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should never be crossed using a CMV.
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do not have traffic control devices.
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usually have a person directing traffic.
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5.
Perception Distance + Reaction Distance + Brake Lag Distance + Braking Distance = ?
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Partial Stopping Distance
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Stopping Distance - (minus) Brake Fade Distance
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Total Air Pressure
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Total Stopping Distance
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