- A 500 gallons or more only
- B 100 gallons
- C 5,000 gallons or more only
- D Used to transport liquid or gaseous materials in tanks of 1,000 gallons or more (singly or in combination) Correct answer
Why this is the correct answer
Federal definition: tanks with 1,000-gallon or more capacity (rated total or in combination) trigger the Tanker endorsement requirement.
How this topic appears on the test
The Tanker CDL exam covers Bulk liquid as a recurring theme. Test-writers favor questions that probe whether the applicant has internalized the safe operating procedure, not merely memorized the rule. When you encounter a question on this topic, slow down and verify that the answer you've chosen describes what a careful, defensive driver would actually do — not what is technically permissible.
If you missed this question, that's exactly the right outcome of a practice session: the goal is to surface gaps before the actual test. Open your state CDL manual to the Bulk liquid section and re-read the relevant subchapter. Then come back and run through the rest of the Tanker practice exam.
For drivers preparing for the Tanker CDL exam, additional context — including federal manual excerpts, employer hiring practices, and DOT medical guidance — is widely available from industry resources. Continue reading on a recommended industry resource for further detail. Always cross-check anything you read with the current edition of your state CDL manual, since enforcement guidance is updated periodically.