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Delaware Doubles / Triples (T) practice test

20 questions · 80% to pass · Required to pull more than one trailer.

How to use this practice test

Read each question, click an answer, and the correct choice is highlighted with a short explanation referencing the underlying CDL Manual concept. Your live score appears at the top of the page. Refresh to reset.

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  1. 1. Most state DMV CDL handbooks state that before uncoupling a rear trailer, you should:

  2. 2. A converter dolly:

  3. 3. Experienced commercial drivers know that when picking up trailers in a triple, the order should be:

  4. 4. Rearward amplification (the "crack-the-whip" effect):

  5. 5. Pulling triples is restricted in many:

  6. 6. According to the FMCSA CDL Manual, rearward amplification (the "crack-the-whip" effect):

  7. 7. Doubles and triples are more likely to roll over because:

  8. 8. When picking up trailers in a triple, the order should be:

  9. 9. According to the FMCSA CDL Manual, a converter dolly:

  10. 10. Most state DMV CDL handbooks state that pulling triples is restricted in many:

  11. 11. Per federal regulations, doubles and triples are more likely to roll over because:

  12. 12. In real-world commercial driving, when coupling a converter dolly to a second trailer, you should:

  13. 13. When taking the CDL knowledge exam, rearward amplification (the "crack-the-whip" effect):

  14. 14. When operating a CMV in interstate commerce, when pulling doubles or triples, the heaviest trailer should be:

  15. 15. Experienced commercial drivers know that before uncoupling a rear trailer, you should:

  16. 16. During a pre-trip inspection, when picking up trailers in a triple, the order should be:

  17. 17. During a pre-trip inspection, when pulling doubles or triples, the heaviest trailer should be:

  18. 18. When operating a CMV in interstate commerce, a converter dolly:

  19. 19. Before uncoupling a rear trailer, you should:

  20. 20. Per federal regulations, pulling triples is restricted in many:

About the Doubles / Triples (T) exam

Doubles and Triples is required to operate a combination with two or three trailers. The exam covers proper coupling order, converter dolly operation, pintle hooks, weight distribution, off-tracking, and managing the rearward amplification (the "crack-the-whip" effect) when steering.

This Delaware-specific edition uses the same federal source material every U.S. state adopts. The Delaware DMV administers the actual exam at its service centers. Bring your CDL handbook for any last-minute reference; it’s free at every Delaware DMV office.

Once you’re consistently scoring above 90% on this practice set, you’re well above the 80% required to pass the official Delaware exam. Drill the questions you miss most often, then take the test cold once a day for a week leading up to your appointment.

Tips that actually work

  • Read every answer choice before clicking. CDL questions are famous for "best answer" wording where two choices look right.
  • Don’t memorize question text — learn the underlying rule. The DMV reshuffles wording constantly.
  • Keep a list of the questions you miss. Re-drill them in isolation until you can’t miss them.
  • Practice in short, frequent sessions. Two 20-minute sessions per day beats one two-hour cram.

What happens after I pass?

Passing the knowledge test earns you a Commercial Learner’s Permit (CLP). You must hold the CLP for at least 14 days before you can take the road skills test, and you must drive with a CDL-holding instructor in the cab during that period. Once you pass the road skills test, your CDL is issued.