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CDL Tanker Endorsement

  • 60 free practice questions, every one explained · no signup
  • Timed mock exam (25 questions, 40 minutes) — free
  • Study guide: free to read online

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01

Test what you know · free, all of it

Four ways to practise.

The same 60 questions, dealt four ways. Pick the one that fits the time you have.

By section
Pick Bulk Liquids & Surge, Driving Safely, Inspection. An explanation appears the moment you answer.
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02

Learn what the questions test

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The three chapters, free online

every chapter free online
  1. 1Bulk Liquids and Liquid SurgeBulk Liquids & Surge · 40% of the exam — the largest sectionRead free →
  2. 2Tank Vehicle InspectionInspection · 30%Read free →
  3. 3Safe Tank Vehicle DrivingDriving Safely · 30%Read free →
03

Before you sit

Know the exam you're walking into.

Free study guideEvery section, online
04

See the questions first

Two from the bank, answered.

Real items, with the answer marked and the reason written out — the same format as all 60.

Bulk Liquids & Surge

What is 'liquid surge' in a tank vehicle?

  1. AThe foaming of liquid caused by rough road surfaces
  2. BThe leakage of liquid past a faulty valve
  3. CThe wave action of liquid that moves back and forth when the vehicle changes speedCorrect
  4. DThe buildup of vapor pressure inside a sealed tank

Why: Liquid surge is the movement of liquid in partially filled tanks. When the driver brakes, the liquid surges forward and can push the truck ahead, then rock it backward. This wave action can strongly affect vehicle handling and control.

Driving Safely

What is the main reason tank vehicles roll over more easily than other trucks?

  1. ATheir extra-wide tires
  2. BTheir high center of gravity combined with liquid surgeCorrect
  3. CTheir low ground clearance
  4. DTheir light overall weight

Why: Tank vehicles carry weight high off the ground and the liquid inside can surge and shift. This high center of gravity plus surging cargo makes them easy to tip in curves and sudden maneuvers. Driving slowly and smoothly is the best defense against rollover.

Read all 60 questions with answers →

06

The exam itself

CDL Tanker Endorsement, by the numbers.

Questions60
SectionsBulk Liquids & Surge · Inspection · Driving Safely
Our bank60 questions · updated September 2026Written from state DMV (under FMCSA standards)
LanguagesEnglish
Sourcestate DMV (under FMCSA standards)
07

Helpful resources

The board's own page, and what else helps.

Find your state's DMV CDL page →

Recommended prep — books & tools

  • Barron's CDL: Commercial Driver's License Test

    Trusted prep brand covering general knowledge plus the tanker endorsement.

    See it on Amazon →

This section contains affiliate links. As an Amazon Associate, PrepPass earns from qualifying purchases. We may earn a commission if you buy through these links, at no extra cost to you.

08

CDL Exams & Endorsements

On the same path.

CDL Air Brakes60 free questions · mock 25 q / 40 minCDL Combination Vehicles60 free questions · mock 20 q / 40 minCDL General Knowledge120 free questions · mock 50 q / 60 min · guide $9.99

All 7 exams in CDL Exams & Endorsements →

09

Questions

Asked before starting.

Is the practice really free, or does it stop after a few questions?

All 60 questions, the timed mock and the report are free with no sign-up. A free account only adds saving your progress.

Is your mock the same as the real CDL Tanker Endorsement?

No. Ours is 25 questions in 40 minutes; the real exam is 60 questions. Use the mock for stamina and section timing, not as a score predictor.

Practice questions are AI-assisted study material written from state DMV (under FMCSA standards) and reviewed by PrepPass — for practice only, not official exam questions. Bank updated September 2026. PrepPass is an independent study resource and is not affiliated with, endorsed by, or approved by state DMV (under FMCSA standards). Always confirm current exam details with state DMV (under FMCSA standards).
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