Practice question

After finishing a pre-trip inspection, you should:

  1. Close the service line valve.
  2. Remove the service line valve.
  3. Leave the emergency line valve open.
  4. Leave the rear shut-off valves open.

Answer: A — Close the service line valve.

The correct answer is shown above. Try the full quiz for additional practice.

Practice more: Pennsylvania CDL HazMat Test 2 →