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CDL Tank Vehicle Endorsement practice test

This free CDL tank vehicle endorsement practice test covers the knowledge test you take on top of your CDL, with original questions written from the federal knowledge requirements in 49 CFR Part 383.

  • Multiple-choice knowledge test
  • 80% to pass (49 CFR 383.135)
  • item count set by your state
Start 20 free questions What’s inside
  • No signup to start
  • Every answer includes a source note
  • Updated October 22, 2026

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Driving & Licenses · Exam prep

CDL Tank Vehicle Endorsement practice test: how the exam works and how to prepare

Original practice questions on the tank vehicle endorsement, written from the federal knowledge requirements in 49 CFR Part 383 and the public CDL manual facts; not official state test questions. The real CDL Tank Vehicle Endorsement test at a glance: Multiple-choice knowledge test, 80% to pass (49 CFR 383.135), item count set by your state. Use these free CDL Tank Vehicle Endorsement practice questions to learn the format and read the explanation and source note behind every answer.

80% is the federal threshold in 49 CFR 383.135. The regulation sets the percentage only — your state driver licensing agency sets how many questions the test has.

  • Learn the tank vehicle topics in the order your state manual teaches them
  • Use the free 20 first, then work the full bank by topic and retest what you missed
  • Read every explanation, including why the wrong options fail
  • Check your state's CDL manual for local numbers and rules before test day
Official format

The real test at a glance

What it takes to pass the CDL Tank Vehicle Endorsement test

80% to pass · question count set by your state

Quick Summary: The official CDL Tank Vehicle Endorsement knowledge test requires a minimum passing score of 80%. Format: Multiple-choice knowledge test. Sourced directly from official state testing blueprints.
  • Multiple-choice knowledge test
  • 80% to pass (49 CFR 383.135)
  • item count set by your state

80% is the federal threshold in 49 CFR 383.135. The regulation sets the percentage only — your state driver licensing agency sets how many questions the test has.

80
practice questions
20
free, no signup
80%
published threshold
40
questions per simulation

Topic coverage

Topics covered in this bank

80 original questions mapped to the listed source topics. Bars show how many questions each topic gets.

Original practice questions on the tank vehicle endorsement, written from the federal knowledge requirements in 49 CFR Part 383 and the public CDL manual facts; not official state test questions.

View full topic blueprint & drills →

Drill down by official testing module:

Inspection10Baffles compartments10Emergency systems10

From the question bank

Try 3 more real questions

Answer in your head, then check. Every explanation cites the official source.

  1. Q1Tank endorsement

    A tank endorsement is needed to haul liquid or liquid gas in tanks with an individual rated capacity of more than how much?

    1. AMore than 55 gallons
    2. BMore than 500 gallons
    3. CMore than 1,000 gallons
    4. DMore than 119 gallons
    Show answer

    D. More than 119 gallons The introduction to Section 8 sets two thresholds. Each tank must be rated at more than 119 gallons, and the tanks together must reach an aggregate rated capacity of 1,000 gallons or more. The 55 gallon, 500 gallon and 1,000 gallon figures are not the per-tank test, because the 1,000 gallons applies only to the combined rated capacity of all tanks on the vehicle.

  2. Q2Tank endorsement

    Does the liquid or gas have to be a hazardous material for a tank endorsement to be required?

    1. AYes, only hazardous liquids need the endorsement
    2. BYes, but only if it is also flammable
    3. CNo, the liquid or gas does not have to be hazardous
    4. DNo, but only for tanks of more than 5,000 gallons
    Show answer

    C. No, the liquid or gas does not have to be hazardous The manual states that a tank endorsement is required for certain vehicles hauling liquids or gases, and that the load does not have to be a hazardous material. Hazard class, flammability and a 5,000 gallon size are not conditions, so a milk, water or fuel tanker of the rated size needs the endorsement just like a hazardous one.

  3. Q3Inspection

    On all tank vehicles, what is the most important item to check for?

    1. ALeaks around the tank, valves and hoses
    2. BTyre wear on the drive axle tyres
    3. CMirror aim on both sides of the cab
    4. DWiper blade condition and washer fluid
    Show answer

    A. Leaks around the tank, valves and hoses Check under and around the vehicle for signs of leaking before loading, unloading or driving. Tyres, mirrors and wipers matter on every vehicle, but on a tank vehicle a leak means lost cargo and possible harm, so the shell, valves and hoses come first in the inspection.

All 20 free questions with answers Take them as a timed quiz

Study plan

How to pass the CDL Tank Vehicle Endorsement

The order that works: learn the rules, drill until they’re automatic, then use the exam simulator to check consistency.

  1. 1

    Learn the tank vehicle topics in the order your state manual teaches them

  2. 2

    Use the free 20 first, then work the full bank by topic and retest what you missed

  3. 3

    Read every explanation, including why the wrong options fail

  4. 4

    Check your state's CDL manual for local numbers and rules before test day

Exam simulator

Sit a timed mock test for the Tanker

One question at a time against a real countdown, no feedback until you submit, flag questions to come back to, then a score against the pass mark with a by-topic breakdown and every answer explained. Topics are mixed across the whole bank, and a retake is a new draw.

Try the free mock test

The free mock test runs 20 questions from the free set, once. Unlocking adds full-length runs of 40 questions from the whole bank. A practice mock test, not an official replica.

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20 q
Full run
40 q
Practice clock
40 min
Pass mark
80%

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  • All 80 questions, every topic
  • 40-question timed exam simulator; see the score note below
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80% is the federal threshold in 49 CFR 383.135. The regulation sets the percentage only — your state driver licensing agency sets how many questions the test has.

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Everything free for the CDL Tank Vehicle Endorsement test

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About these questions

Written by QuizCram from the official source and verified against its text — never copied from a real exam. Original practice questions on the tank vehicle endorsement, written from the federal knowledge requirements in 49 CFR Part 383 and the public CDL manual facts; not official state test questions.

Questions last updated
October 22, 2026
Bank version
v1 · 80 questions

Good to know

CDL Tank Vehicle Endorsement FAQ

Federal rules set the 80% passing threshold but not a question count. Each state writes its own test, so confirm the number with your state agency.

No. These are original practice questions on the tank vehicle endorsement. Your state licensing agency writes and scores the real test, and its CDL manual is the final word on local rules.

Yes. Open the exam simulator and sit a timed mock test of 20 questions built from the free questions, once, with no signup. Unlocking the exam adds full-length runs of 40 questions in 40 minutes (a practice clock), as many as you like, each a new draw from the whole bank.

The exam's agency publishes no topic weights, so it mixes topics in proportion to the question bank, favouring questions you missed before and never repeating one within a run. A retake is a new draw, so you will meet different questions. It is a practice mock test, not an official replica of the real exam.

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