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Practice test 5 of 10

Virginia CDL — Air Brakes Practice Test 5

The Virginia 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.What has testing shown about using the front wheel brakes on slippery surfaces?
  2. 2.How does the controlled braking method work in an emergency stop?
  3. 3.Even when a vehicle has an alcohol evaporator, what daily cold-weather task is still required (unless the tanks drain automatically)?
  4. 4.Which foundation-brake design is the most common on air-brake vehicles?
  5. 5.A visible low-air-pressure warning must activate before tank pressure drops below what level?
  6. 6.Some buses have dual parking control valves with a separate air tank. What is that separate tank for?
  7. 7.On a long grade, if you must keep increasing application pressure just to hold the same speed, what is most likely happening?
  8. 8.When inspecting brake drums, a crack is too long if it is longer than what?
  9. 9.Why is it important to drain the air storage tanks?
  10. 10.At about what pressure is the safety relief valve usually set to open?

0 of 25 answered