Driving · Commercial
CDL Tank Vehicles (N) Endorsement Test
The knowledge test for the N endorsement: inspecting tankers, high center of gravity, liquid surge, baffles and bulkheads, outage, and driving a tank vehicle smoothly.
Questions last checked against the official sources on October 10, 2026.
The real exam at a glance
- Questions
- 20 (varies by state)
- To pass
- 80% (16 of 20)
- Time
- About 20 minutes (varies by state)
- Test type
- Knowledge test only
- Based on
- Section 8 of your state's CDL manual
What you'll practise
Try a question
Which valves does the manual tell you to check on a tank vehicle?
- Only the fuel tank vent valve
- Only the air tank drain valves on the tractor
- Intake, discharge and cut-off valves
- Only the radiator drain valve
Show the answer
C. Intake, discharge and cut-off valves — Check the intake, discharge and cut-off valves (CDL Manual 8.1.1)
Sample questions by topic (in English)
- Endorsement rules
- Inspecting tank vehicles
- Liquid surge
- Bulkheads and baffles
- Outage and loading
- Safe driving rules
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Questions about the CDL Tank Vehicles
Is this the official CDL Tank Vehicles?
No. Semplr is independent and not affiliated with the exam body. We write every question ourselves, in the official format and at the official level.
What is the real CDL Tank Vehicles like?
Questions: 20 (varies by state). To pass: 80% (16 of 20). Time: About 20 minutes (varies by state). Test type: Knowledge test only. Based on: Section 8 of your state's CDL manual.
How is my practice marked?
Instantly. You see your score against the pass mark, and an explanation for every question — including the ones you got right.
Can I take it on my phone?
Yes. The whole mock exam works on a phone, and your progress is saved in your browser.
Ready for a full run?
One sitting, real timing, then your score against the pass mark.
Start the free mock exam