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Doubles & Triples Practice Question 28

TDoubles & Triples · Question 28

For triples, the air system must be:

• AIdentical to a single
• BCharged through three trailers and three sets of glad hands; allow extra time to charge fully
• CDisconnected at the rear
• DPressurized to 200 psi

Correct answer: B. Charged through three trailers and three sets of glad hands; allow extra time to charge fully

Why: Triples have more volume and more connections; expect longer charging times and more places for leaks. Test the warning device after each connection.

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

• Q51. A 'lunette ring' is:
• Q4. Rearward amplification:
• Q17. A 'turntable' on a converter dolly:
• Q31. When parked overnight, you should:
• Q44. A driver should never attempt to:

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.