Nebraska 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 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.
You have made error so far
Passing grade —
5 or fewer errors
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1.
What happens if the air pressure in a system's air tanks falls below 60 psi?
A warning light will come on.
The vehicle will not shift out of gear.
The front lights will flash.
The vehicle should stop.
2.
What is a wig wag?
A type of warning system
A tube used to move air from the compressor to the tanks
A noise made by air brakes when used
A part within the braking unit that allows air to move freely
3.
A tank endorsement is:
Only required when transporting gases.
Only required when transporting liquids.
Required to transport both liquids and gases.
Optional when transporting hazardous materials.
4.
When the spring brakes are on, you should never:
Turn on the lights.
Turn off the vehicle.
Push down the brake pedal.
5.
Air pressure should build up in a single air system within:
15 minutes.
12 minutes.
Three minutes.
6.
What kind of force do emergency brakes use?
Air pressure
Mechanical
Heavy
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