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Compressed air
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Liquid nitrogen
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Carbon dioxide
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Nebraska CDL Permit Test - Air Brakes
(From the 2021 Nebraska CDL driver handbook)
| 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 two, three or four answer choices. To pass, the applicant must answer at least 20 questions correctly. Test questions come from the Nebraska 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.
Passing grade —
5 or fewer errors
advertising
1.
Air brakes use ____ to function.
2.
A low air pressure warning signal:
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Is not recommended on vehicles with air brakes.
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Is required on vehicles with air brakes.
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Is optional on vehicles with air brakes.
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3.
While driving downhill, you should brake until you reach a speed that is ____ below your safe speed, then release the brake pedal.
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5 mph
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10 mph
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15 mph
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20 mph
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4.
During a static leakage test, what is the maximum leakage rate that is safe for a double combination vehicle?
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3 psi in one minute.
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6 psi in one minute.
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8 psi in one minute.
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5.
You should ____ if the low pressure warning signal activates while you are driving.
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Stop where you are and park
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Exit the roadway as soon as safely possible
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Continue driving normally
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6.
When using the controlled braking method in an emergency situation, you should:
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Apply the brakes as hard as possible without locking the wheels.
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Apply the brakes with about half of your usual force.
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Apply the brakes so the wheels lock.
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Apply the brakes with minimal pressure.
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