Practice question

On the Colorado CDL General Knowledge test, what is the proper RPM range for shifting gears in most commercial diesel engines?

  1. 500 to 1,000 RPM
  2. 1,000 to 1,500 RPM (the "sweet spot" for most diesel engines)
  3. 2,500 to 3,500 RPM
  4. 4,000 to 5,000 RPM

Answer: B — 1,000 to 1,500 RPM (the "sweet spot" for most diesel engines)

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

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