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Tennessee CDL Practice Test: Air Brakes - Test 2019

(From the 2019 Tennessee CDL Handbook)
Number of tests: 1
Number of questions: 25
Passing score: 80

Directions: To obtain this endorsement required to drive a vehicle with air brakes, applicants must pass a 20-question test. And to pass the test, applicants must score at least 80%. Test questions are from the Tennessee Commercial Driver Handbook. The School Bus endorsement can be used with the Class A, B, or C CDL. If you need additional information, please contact your local DMV office. You can find your nearest DMV office at Tennessee DMV locations.

You have made 2 errors so far.
1. What kind of force must emergency brakes use?
  • Mechanical

  • Heavy

  • Air pressure

2. Having ABS on only one axle:
  • Will slow the vehicle, but not stop it

  • Can be dangerous

  • Should still give you more control

3. A dual air brake system:
  • Has one air brake system for the left side and right side of the truck

  • Has two separate air brake systems which use a single set of controls

  • Has a single air brake system, but have two sets of controls

4. When going down a steep downgrade,
  • The vehicle should be placed in a lower gear and brakes used to supplement braking

  • The vehicle should be continually downshifted instead of using the brakes

  • The air brakes should be used

5. What part of the truck is the air compressor connected to?
  • Transmission

  • Radiator

  • Engine

6. If the vehicle has air brakes, the air compressor drive belt should be checked before each drive. In what condition should the belt be in?
  • Tight

  • Cracked

  • Loose