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Doubles & Triples Practice Question 7

TDoubles & Triples · Question 7

Safety chains on a converter dolly are required because:

• AThey look professional
• BIf the pintle hook fails, the chains keep the dolly attached and prevent runaway
• CThey carry electrical signal
• DThey are decorative

Correct answer: B. If the pintle hook fails, the chains keep the dolly attached and prevent runaway

Why: Chains are the backup if the primary coupling fails. Inspect for proper rating, secure attachment, and crossing under the tongue to catch the tongue if it drops.

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

• Q49. When pulling triples in mountainous terrain, the most important driving principle is:
• Q2. A 'converter dolly' is:
• Q16. When checking a converter dolly's brakes you should:
• Q29. When approaching an exit ramp with triples, you should:
• Q42. The 'air loss' tolerance with all units coupled is:

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.