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Tennessee 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 or four answer choices. To pass, the applicant must answer at least 20 questions correctly. Test questions come from the Commercial Driver Guide. 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.
If the spring brakes are on, you should:
Not use the brake pedal.
Press the accelerator.
Move the steering wheel.
2.
Which part of the truck is the air compressor connected to?
The transmission
The engine
The radiator
The door latch
3.
Why do large vehicles use air brakes?
Other brake systems squeak too loudly.
Air brakes are very effective systems.
Other braking systems are hard to come by.
4.
Some air brake systems introduce alcohol into the system to:
Make the brakes work without squeaking.
Prevent ice from forming in the brake system.
Prevent people from breathing the air from the system.
5.
A tank endorsement is:
Only required when transporting gases.
Only required when transporting liquids.
Required when transporting both liquids and gases.
Optional when transporting hazardous materials.
6.
Before driving a vehicle with air brakes, you should ensure that the spring brakes come on automatically when:
Air pressure falls below 45 psi.
Air pressure falls below 20 psi.
Driving downhill.
Driving uphill.
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