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Free Tanker Endorsement Practice Test Online

Official exam: CDL Tanker Vehicle Endorsement

Take a free Tanker Endorsement practice test online: a full 40-question paper with every answer explained, no sign-up, scored by topic. The full 102-question bank and the timed simulator are $14.99 for 30 days.

First published: September 2, 2026Bank updated: September 2, 2026Published by CertQuestUSA · review process
TL;DR

CDL Tanker Vehicle Endorsement: a 102-question practice bank for the real CDL Permit & Endorsement Exams standard, 2 full papers of 40 questions each with no repeats, every question written to the regulation it comes from.

Where these questions come from

Every question in this bank cites a source -- primarily FMCSA CDL Manual (77%) and 49 CFR (23%) of this exam's citations.

Take a full practice test free. 40 real questions built to the exam's domain weights, every answer explained, no sign-up required, with a domain-by-domain score at the end.
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2
full papers, no repeats
40
questions per paper
102
questions in the bank
What this exam covers
5 real sample questions
What causes liquid surge in a partially filled cargo tank?
A. Movement of the liquid inside the tank as the vehicle speeds up, slows down, or turns
B. Air trapped in the vapor recovery line
C. The pressure relief valve cycling open and closed
D. Uneven tire pressure between the drive axles
Show answer and reasoning

Correct answer: A. Movement of the liquid inside the tank as the vehicle speeds up, slows down, or turns

  • B: Vapor recovery lines vent vapor, not liquid, and trapped air does not create the surge wave described in the manual.
  • C: The relief valve responds to internal tank pressure; it does not cause the liquid wave itself.
  • D: Tire pressure affects handling generally but is not the cause of liquid surge described in the manual.
Source: FMCSA CDL Manual §8.2.2
A tanker is coming to a stop on an icy road. What can happen when the surging liquid wave reaches the front of the tank?
A. The wave can push the stopped truck forward, potentially into an intersection
B. The tank will automatically vent to relieve pressure
C. The brakes will lock regardless of driver input
D. The outage space will fill completely, sealing the tank
Show answer and reasoning

Correct answer: A. The wave can push the stopped truck forward, potentially into an intersection

  • B: Venting responds to internal pressure buildup, not to the forward push described from surge on ice.
  • C: Surge does not override the brake system directly; it pushes the vehicle mass, not the brake mechanism.
  • D: Outage is expansion space for temperature change, unrelated to surge pushing the truck.
Source: FMCSA CDL Manual §8.2.2
Besides retest and marking requirements, 49 CFR 383.119(a) also requires the tank endorsement test to cover "operating practices and procedures" described how?
A. Not otherwise specified elsewhere in the listed test content areas
B. Only those published by the vehicle manufacturer
C. Only those specific to a single named carrier
D. Operating practices are excluded entirely from the tank endorsement test
Show answer and reasoning

Correct answer: A. Not otherwise specified elsewhere in the listed test content areas

  • B: The regulation’s catch-all language is not limited to manufacturer-published practices alone.
  • C: The regulation is a federal testing standard, not tied to one specific carrier’s internal practices.
  • D: The regulation explicitly includes a catch-all category for operating practices and procedures not otherwise specified.
Source: 49 CFR 383.119(a)
Why does 49 CFR 180.405 matter to a driver hauling hazardous liquids, even though the driver is not the one certifying the tank’s specification?
A. The driver is operating equipment that must already conform to an authorized DOT/MC specification, and the driver’s pre-trip inspection should catch obvious non-conformance signs like damage or missing markings
B. It does not matter to drivers at all since it only governs manufacturers
C. It only applies to tank vehicles operated outside the United States
D. It replaces the driver’s pre-trip inspection duty entirely
Show answer and reasoning

Correct answer: A. The driver is operating equipment that must already conform to an authorized DOT/MC specification, and the driver’s pre-trip inspection should catch obvious non-conformance signs like damage or missing markings

  • B: While manufacturers and tank testers bear certification duties, the driver’s inspection responsibility for the equipment they operate remains relevant.
  • C: The regulation is a domestic DOT hazardous materials transportation standard, not limited to international operation.
  • D: Tank specification conformance does not replace the driver’s separate pre-trip inspection duty under other provisions.
Source: 49 CFR 180.405
What is the function of baffles inside a liquid cargo tank?
A. Bulkheads with holes that let liquid flow through while helping control forward-and-backward surge
B. Solid dividers that completely separate the tank into sealed compartments
C. External braces that reinforce the tank shell against rollover
D. Filters that remove sediment from the liquid before unloading
Show answer and reasoning

Correct answer: A. Bulkheads with holes that let liquid flow through while helping control forward-and-backward surge

  • B: Solid, sealed dividers describe bulkheads used to create separate compartments, not baffles.
  • C: Baffles are internal surge-control devices, not external structural reinforcement.
  • D: Baffles are not filtration devices; they do not remove sediment.
Source: FMCSA CDL Manual §8.2.4
Real-world data for this exam
Heavy and Tractor-Trailer Truck Drivers: real median wageMay 2025$58,640/yrPart of the real CDL Driver career pathExplore ›

Frequently asked questions

Where can I take a free Tanker Endorsement practice test online?
Right here. CertQuestUSA's free Tanker Endorsement practice test online is a full 40-question practice paper built to the real exam's domain weights, with every answer explained, with no sign-up and no credit card, and shows your score by topic at the end. The full 102-question bank, with every answer explained and cited to the regulation it comes from, is $14.99 for a 30-day pass that never renews.
How many questions are on the CertQuestUSA CDL Tanker Vehicle Endorsement practice test?
102 questions total, split into 2 full papers of 40 each with no repeats across papers.
What topics does the CDL Tanker Vehicle Endorsement test cover?
10 domains, with the heaviest weight on Inspecting Tank Vehicles (13%), Liquid Surge and Movement (13%), and Baffled, Bulkhead, and Smooth Bore Tank Design (12%).
Where do CertQuestUSA's CDL Tanker Vehicle Endorsement questions come from?
Primarily FMCSA CDL Manual (77%) and 49 CFR (23%) of this bank's citations -- computed directly from this exam's own question sources, not a generic description.
Is there a free CDL Tanker Vehicle Endorsement practice test?
Yes -- one full 40-question practice paper built to the exam's domain weights, free with no sign-up, with every answer explained and a domain-by-domain score at the end.
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