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Combination Vehicles Practice Question 62

Required for Class ACombination Vehicles · Question 62

When the trailer landing gear sticks during raising or lowering, you should:

• AForce it with a long bar
• BInspect for binding, lubricate, and have it serviced before the next trip
• CIgnore it
• DDisconnect the trailer immediately

Correct answer: B. Inspect for binding, lubricate, and have it serviced before the next trip

Why: Forcing damaged landing gear leads to expensive repairs or injury. Service binding gear and use the proper crank speeds (high gear vs. low gear).

How this question fits the Combination test

Articulated vehicles fail in unique ways: trailer swing under braking, rearward amplification under steering, and jackknife under loss of traction. Combination Vehicle knowledge is required for any Class A applicant under 49 CFR 383.111.

Study technique for this topic

Walk through the coupling sequence verbally until it's second nature. Know the safe-rolling rearward amplification factor, the difference between trailer service brakes and parking brakes, and what creates the conditions for a tractor jackknife.

Related Combination practice questions

• Q40. When approaching an intersection in a combination vehicle, you should:
• Q53. The blind spots of a tractor-trailer include:
• Q3. The kingpin is part of the:
• Q16. A loaded trailer with a high center of gravity is most prone to roll over:
• Q29. A leaky air line between tractor and trailer will most likely cause:

Continue your CDL preparation

The Combination Vehicles portion of the CDL knowledge exam covers more than this single question. Use this site's full Combination Vehicles 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.