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Doubles & Triples Practice Question 38

TDoubles & Triples · Question 38

The fifth wheel on a converter dolly:

• AIs decorative
• BFunctions exactly like a tractor fifth wheel and must be inspected and properly engaged
• CLocks the wheels
• DHolds the spare tire

Correct answer: B. Functions exactly like a tractor fifth wheel and must be inspected and properly engaged

Why: The dolly's fifth wheel does the same job as the tractor's. Inspect for proper engagement, locked jaws, secured release lever, and grease.

How this question fits the Doubles/Triples test

Each additional articulation point multiplies rearward amplification. A driver pulling triples must steer earlier, brake sooner, and inspect twice as much equipment as a single-trailer driver.

Study technique for this topic

Learn the correct trailer placement order by weight, the procedure for converting a single to a double, and the special inspection items unique to converter dollies and pintle hook assemblies.

Related Doubles/Triples practice questions

• Q6. Coupling a converter dolly to a second trailer involves:
• Q19. The rear trailer in a triple can swing how much more than the tractor on a quick steering …
• Q32. A driver of doubles/triples should keep a minimum following distance of:
• Q46. The converter dolly tongue is:
• Q59. Mirror checks for doubles/triples should be:

Continue your CDL preparation

The Doubles & Triples portion of the CDL knowledge exam covers more than this single question. Use this site's full Doubles & Triples bank to drill every topic, then test yourself with one of our state-specific practice sets to confirm you are ready for the actual DMV exam in your state. Always check your state's CDL handbook for any local addenda before the test day.

If you are still building your overall CDL foundation, start with the General Knowledge bank — every CDL applicant must pass it — and then work outward to the endorsements you plan to add.