Practice question

What is the danger of using the trailer hand valve to stop a skid?

  1. It can lock trailer wheels and make a trailer skid or jackknife worse
  2. It always straightens the trailer
  3. It only operates headlights
  4. It reduces all braking force to zero

Answer: A — It can lock trailer wheels and make a trailer skid or jackknife worse

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

Practice more: Missouri CDL General Knowledge Practice Questions - Missouri Commercial Driver License General Knowledge Test Exam →