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Free DC CDL Double/Triple Trailers Practice Test 2024

Part of mandatory Entry-Level Driver Training Course Based on 2024 DC commercial driver's license manualAvailable in EN, ES
20questions
4mistakes allowed
80%passing score

This CDL practice test is a great place to start if you’re after the DC Double/Triple Trailers endorsement. Each of the 20 questions is based on the official 2024 CDL manual. The test is designed to prepare you for the Double/Triple Trailers portion of your 2024 Commercial Driver’s License exam. There are several answer options, but only one of them is correct. Every time you answer a question, you’ll get immediate feedback with a detailed explanation, so you won’t need to wait until the end of the test to know the correct answers.

5 out of 5 • 1 votes.

Perfect for

  • First-time DC CDL and CLP applicants
  • CDL holders adding endorsements
  • DC CDL renewal applicants
DC commercial driver's license

What to expect on the actual exam

How many questions20
How many correct answers to pass16
Passing score80%
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List of questions (classic view)

  1. When you're pulling more than one trailer, which trailer should be the first one behind the tractor?
  2. Which of these statements about quick steering movements and doubles/triples is true?
  3. You are driving a 100-foot double trailer combination at 50 mph. The road is dry and visibility is good. You should keep at least ____ seconds of space ahead of you.
  4. Before connecting a converter dolly to a second or third trailer, you should check the height of the trailer. The trailer height is right if
  5. You are driving a 100-foot double trailer combination at 30 mph. The road is dry and visibility is good. You should keep at least ____ seconds of space ahead of you.
  6. With the hand valve on, you should test the trailer brakes by opening the service line valve at the rear of the rig. When you do this, you should hear
  7. Empty trucks
  8. Which of these statements about handling doubles and triples is true?
  9. Before you can supply air to the air tanks of a second trailer, you need to
  10. You are driving with double trailers and must use your brakes to avoid a crash. For emergency braking, you should
  11. How can you be sure that you supplied air to a second trailer?
  12. What is likely to happen if the pintle hook is unlocked while the dolly is still under the second trailer?
  13. You want to hook your combination to a second trailer that does not have spring brakes. To do this without wheel chocks, you should
  14. Which of these statements about managing space to the sides is true?
  15. The crack-the-whip effect that troubles trucks with trailers is most likely to tip over
  16. You are visually checking the coupling of a converter dolly to the rear trailer. How much space should there be between the upper and lower fifth wheel?
  17. You are pulling doubles. A set of trailer wheels goes into a skid. Which of the following is most likely to occur?
  18. You are doing a walk-around inspection of a double or triple trailer rig. You should be sure that the converter dolly air tank drain valves are ______ and the pintle hook is _______.
  19. A converter dolly is
  20. A converter dolly consists of a ______ wheel and ________ axles.

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