Delaware Tanker Endorsement Test (DE) 2026

4.9 out of 5 (53 votes)
80% Passing score
20 Questions
4 Mistakes allowed
Get ready to ace your Delaware CDL tanker endorsement test with our comprehensive Delaware CDL tanker practice test. This driving test practice is meticulously designed to cover all critical aspects, ensuring you gain the knowledge and confidence needed to excel. With 20 carefully crafted questions, you will be tested on essential topics including liquid surge, weight distribution, emergency protocols, regulatory compliance, and vehicle inspection. Our Delaware drivers license test practice mirrors the multiple-choice format used in the actual DMV written permit test, allowing you to hone your skills in eliminating incorrect answers and identifying the correct ones. Understanding the challenges of managing liquid surge is crucial for any tanker vehicle operator. Our Delaware DMV practice test places a strong emphasis on this aspect, preparing you for the real-world scenarios that significantly impact vehicle stability and handling. Regular specialized inspections are another critical component of tanker vehicle operation, and our CDL tanker test ensures you are well-versed in the procedures to keep your tank and vehicle components in optimal condition. Whether you hold a commercial driver's license or a commercial learner's permit, our Delaware tanker endorsement test is an indispensable tool for your preparation. This DMV test practice is focused solely on the specific endorsement, featuring questions that you will encounter on the actual CDL permit test. Moreover, the Delaware CDL tanker practice test draws from a large pool of questions, providing a varied and thorough preparation experience. It's important to note that obtaining a commercial driver's license requires passing both the specific endorsement test and the general knowledge test. If you need additional study resources, we also offer general knowledge prep tests to complement your preparation. Dive into our Delaware CDL tanker endorsement test and equip yourself with the necessary knowledge to succeed.
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Sample Delaware Tanker Test Questions

Question 1

What feature identifies a smooth-bore liquid tank?

  1. A It is divided into several sealed compartments
  2. B It contains perforated baffles
  3. C It has no internal baffles to slow liquid movement
  4. D It is equipped with additional insulation

Correct answer: C – It has no internal baffles to slow liquid movement

A smooth-bore tank is an unbaffled liquid tank with nothing inside to slow the liquid’s flow. This allows strong forward-and-back surge, particularly while starting or stopping. Drivers must use extra caution and make smooth, controlled changes in speed when operating these tank vehicles.

Source: Delaware Commercial Driver’s Manual — § 8.2.5, “Un-baffled Tanks”

Question 2

Before attempting to extinguish a fire involving a tank vehicle, what should you do?

  1. A Move close to the flames to identify the cargo
  2. B Make sure the fire will not spread farther
  3. C Open the tank to release pressure
  4. D Wait for a mechanic before notifying emergency services

Correct answer: B – Make sure the fire will not spread farther

Before trying to extinguish a vehicle fire, take steps to keep it from spreading. Park in an open area away from buildings, trees, brush, vehicles, and other things that could ignite, and notify emergency services. Do not open a tank or other cargo enclosure merely to investigate the fire.

Source: Delaware Commercial Driver’s Manual — § 2.21.3, “Fire Fighting”

Question 3

If a tank leaks and causes a spill, what financial consequence is possible?

  1. A You may be held liable for cleanup costs
  2. B You can never be responsible for cleanup costs
  3. C You are automatically responsible for every cleanup expense
  4. D The shipper must always handle the cleanup alone

Correct answer: A – You may be held liable for cleanup costs

A tank driver must inspect under and around the vehicle for evidence of leaks and must not transport liquid or gas in a leaking tank. If a spill occurs, the driver or carrier may face cleanup liability. The manual does not state that liability is automatic in every case.

Source: Delaware Commercial Driver’s Manual — § 8.1.1, “Leaks”

Question 4

For the tank-vehicle endorsement definition, each tank counted toward the 1,000-gallon aggregate threshold must have an individual rated capacity greater than how many gallons?

  1. A 50 gallons
  2. B 75 gallons
  3. C 100 gallons
  4. D 119 gallons

Correct answer: D – 119 gallons

Federal CDL rules define a tank vehicle using tanks with an individual rated capacity greater than 119 gallons and a combined rated capacity of at least 1,000 gallons. The tanks may be permanently or temporarily attached to the vehicle or chassis. A driver operating a commercial motor vehicle that meets this definition needs the tank vehicle endorsement.

Source: Delaware Commercial Driver’s Manual — § 8, “Tank Vehicles”, 49 CFR § 383.5 – Definitions, 49 CFR § 383.93(b)–(c) – Endorsements

Question 5

A tank vehicle with a high center of gravity is safer and more stable than one with a low center of gravity.

  1. A True
  2. B False

Correct answer: B – False

A high center of gravity makes a tank vehicle top-heavy and easier to roll over. Liquid tankers are particularly vulnerable because their cargo can surge and shift while the vehicle is moving. Drivers should take curves and entrance or exit ramps well below posted advisory speeds when necessary to prevent rollover.

Source: Delaware Commercial Driver’s Manual — § 8.2.1, “High Center of Gravity”

Question 6

What movement are baffles primarily designed to reduce inside a liquid tank?

  1. A Expansion caused by temperature changes
  2. B Forward-and-back liquid surge
  3. C All side-to-side liquid movement
  4. D The total weight of the liquid

Correct answer: B – Forward-and-back liquid surge

Baffles are bulkheads with openings that allow liquid to pass through while slowing its forward-and-back movement. They reduce longitudinal surge during acceleration and braking. Baffles do not eliminate side-to-side surge, so rollover risk remains when the tank vehicle turns or changes direction.

Source: Delaware Commercial Driver’s Manual — § 8.2.4, “Baffled Tanks”

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