90. You want to inspect the trailer supports. You should place the tractor transmission in which gear after you have uncoupled the trailer?
Detailed Explanation
The correct answer is "b. Neutral.". This question tests combination vehicles knowledge and the safest action expected of a commercial driver. For a differently worded version of this question, identify the hazard first and then choose the answer that preserves control, visibility, or legal compliance.
Correct Answer: b. Neutral.
Why This Matters on the CDL Test
This question tests whether you can distinguish systems that add gear ratios from a transmission that shifts automatically. Review multi-speed rear axles, auxiliary transmissions, automatic-transmission ranges, and safe shifting because those concepts appear together in the CDL manual.
How to Remember It
Say the rule in your own words, then explain why the wrong answers are unsafe or incomplete. That habit makes similar Combination Vehicles questions easier when the exam changes the wording.
Answer Review
Choose "b. Neutral." because this answer matches the safe CDL action for coupling and trailer support inspection. On the knowledge test, the safest answer is usually the one that protects space, control, visibility, legal compliance, or inspection accuracy before the vehicle is put at risk.
Why the other answers are weaker
- a. Low reverse."a. Low reverse." does not best answer this coupling and trailer support inspection question. When you see a similar option on the CDL permit test, compare it against the exact safety rule and choose the answer that prevents the most immediate risk.
- c. High reverse."c. High reverse." does not best answer this coupling and trailer support inspection question. When you see a similar option on the CDL permit test, compare it against the exact safety rule and choose the answer that prevents the most immediate risk.
Test-Day Checklist
- Read the question once for the topic, then read it again for the exact CDL action being tested in Combination Vehicles.
- Eliminate answers that sound convenient but skip an inspection, warning sign, or safety step.
- Say the correct rule out loud before moving on so you can recognize it when the exam changes the wording.
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Start Practice TestRelated Questions
17. The front trailer supports are up and the trailer is resting on the tractor. Make sure:
34. Where should the tractor be when you inspect landing gear after uncoupling the trailer?
50. The iron trailer supports are up and the trailer is resting on the tractor. Make sure:
66. What gear should the tractor engine be in after you uncouple from the trailer and are inspecting the trailer supports?
1. You are coupling a semi trailer to your tractor but have not yet backed under. The trailer is at the right height when:
Keep Studying Combination Vehicles
Question pages help you review one rule at a time. To build test-day speed, move back into the full Combination Vehicles practice test and answer a mixed set without looking at the explanation first.
State CDL Practice Paths
After you understand this answer, use a state practice path to connect the federal CDL rule with the DMV test pages drivers search for most.