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Practice test 10 of 10

Mississippi CDL — Air Brakes Practice Test 10

The Mississippi CDL — Air Brakes knowledge test has ~25 questions; you need ~20 correct (80%) to pass.

This practice test follows that format: 25 questions, pass with 20 correct. Answer every page, then grade it to see the answers and explanations.

Questions 1–10 of 25

  1. 1.During the governor check with the engine at a fast idle, how can you tell the governor has cut out the compressor?
  2. 2.On an air-braked vehicle, the final air brake checks take the place of which part of the seven-step inspection?
  3. 3.As brake drums overheat and expand on a long downgrade, why does braking get weaker?
  4. 4.Which statement about wedge brakes is accurate?
  5. 5.During the final air brake check, with the engine idling, how do you lower tank pressure to see whether the compressor cuts back in?
  6. 6.You find you need more and more application pressure to hold the same speed. Besides fading brakes, what else can cause this?
  7. 7.You are driving an air-braked truck at 55 mph on dry pavement when you spot a hazard. With good traction and brakes, about how much road will you cover from seeing it to stopping?
  8. 8.During the walk-around, what are you checking for on the air hoses that feed the brake chambers?
  9. 9.A parked truck slowly loses all its air overnight through a small leak. Why does its parking brake keep holding?
  10. 10.In stop-and-go traffic you keep pressing and releasing the brake pedal far more than you need to. What could this lead to?

0 of 25 answered