How Many Questions Are on the Tennessee CDL General Knowledge Test?

Unlike Tennessee's regular permit test, which has an explicit 60-minute time limit, the CDL general knowledge test's length and passing score come from federal regulation (49 CFR Part 383), and Tennessee doesn't publish a separate time cap for it.

The test covers commercial driving fundamentals common to nearly every CDL applicant nationwide, including vehicle inspection, air brakes, cargo securement, and hours-of-service rules.

Tennessee's commercial learner's permit (CLP) costs $14 for Class A or $13 for Class B/C, and is valid for 12 months.

The official test draws from a broad, federally-defined set of topics rather than any single area, which is why understanding the reasoning behind a rule matters more than memorizing an isolated fact.

Our free Tennessee CDL practice tests cover 17 topic areas, including hours-of-service, cargo securement, and air brakes, so you can see which areas need more review.

Rather than mirroring the exact 50-question format, dmvwrittenexam.com splits its 100+ original Tennessee CDL questions into multiple practice tests, giving you more total repetitions across more topics than one official-length test would.

Each question includes an explanation and a source reference, so you learn why an answer is correct instead of memorizing a letter.