Washington Tanker Endorsement Practice Test (WA) 2

4.9 out of 5 (87 votes)
80% Passing score
20 Questions
4 Mistakes allowed
If you're preparing for your Washington state CDL tanker endorsement, this Washington CDL tanker endorsement test is an essential tool to ensure you're ready for the road. WA's unique geography and bustling commerce demand that drivers are well-versed in handling tanker vehicles safely and effectively. Whether you're navigating the tight streets of Seattle during Seafair or transporting goods across the Cascades, mastering the intricacies of tanker driving is crucial. This CDL tanker practice test offers 20 carefully crafted questions designed to challenge your understanding of critical topics such as managing liquid surge, maintaining weight stability, and adhering to the rigorous safety procedures that are part of everyday tanker operations. These questions are sourced directly from the official Washington state State Driver's Manual, ensuring that the content you're practicing is exactly what you'll face on the actual Washington CDL tanker test. Remember, if it's not in the manual, it won't be on the test-making this WA CDL practice test a reliable resource for your preparation. With each question, you'll receive immediate feedback and detailed explanations, helping you understand the reasoning behind correct and incorrect answers. This feature not only helps you learn but also reinforces key concepts necessary for safe tanker operation. The Washington state tanker endorsement test goes beyond basic knowledge, diving into the complexities of tanker vehicles' high center of gravity, which makes them more prone to tipping-a critical factor when driving on Washington's winding mountain roads or through the dense urban areas. At the end of your WA practice written driving test, you'll receive a comprehensive summary of your performance. This recap highlights any questions you missed and provides the correct answers, offering you a valuable opportunity to review and solidify your knowledge. Aiming to score at least 16 out of 20 correct answers will put you on the right track toward earning your endorsement and ensuring you're equipped to handle one of the most demanding roles in commercial driving. So whether you're hauling through Spokane's agricultural heartland or the industrial hubs along the Columbia River, this knowledge test practice is your gateway to mastering the challenges of tanker vehicle operation in Washington state.
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Sample Washington Tanker Test Questions

Question 1

Which driver action can cause a tank vehicle to skid?

  1. A Applying too much acceleration
  2. B Braking too hard
  3. C Steering too sharply
  4. D Any of these

Correct answer: D – Any of these

A tank vehicle can skid if the driver over-steers, over-accelerates, or over-brakes. A skid involving the drive or trailer wheels may develop into a jackknife. The Washington State Commercial Driver Guide instructs drivers to take action to restore wheel traction whenever a skid begins.

Source: Washington State Commercial Driver Guide — § 8.3.5, “Skids”

Question 2

A tanker may roll over even at the posted speed for which roadway features?

  1. A Highway curves
  2. B On-ramp curves
  3. C Off-ramp curves
  4. D All of these

Correct answer: D – All of these

Liquid tankers have a high center of gravity, making them top-heavy and especially prone to rollovers. Tests cited in the CDL guide show that tankers can overturn at posted curve speeds. Drivers should take highway curves and on- and off-ramp curves well below posted speeds, slowing before the curve and accelerating slightly through it.

Source: Washington State Commercial Driver Guide — §§ 8.2.1 and 8.3.3, “High Center of Gravity” and “Curves”

Question 3

A CMV carries an empty 1,200-gallon storage container on a flatbed. The container was not designed for transportation and is temporarily attached. How is the CMV classified?

  1. A As a tank vehicle because the container exceeds 119 gallons
  2. B As a tank vehicle because the container is attached to the trailer
  3. C As a tank vehicle because the container holds at least 1,000 gallons
  4. D It is not considered a tank vehicle

Correct answer: D – It is not considered a tank vehicle

Federal regulation expressly excludes this situation from the tank-vehicle definition. A CMV carrying an empty storage container rated at 1,000 gallons or more is not a tank vehicle when the container was not designed for transportation and is temporarily attached to a flatbed trailer. Every condition in this exception must be present.

Source: 49 CFR § 383.5 — Definitions

Question 4

Why does operating a liquid tank vehicle require specialized driving skill?

  1. A Its high center of gravity combines with liquid movement
  2. B Its low center of gravity combines with liquid movement
  3. C Tank trailers are longer than all other trailers
  4. D Liquid cargo does not respond to normal braking

Correct answer: A – Its high center of gravity combines with liquid movement

The Washington State Commercial Driver Guide identifies a high center of gravity and liquid movement as the reasons special skill is needed. Weight carried high makes the vehicle top-heavy and easier to roll over. In a partially filled tank, liquid surge can push the vehicle and adversely affect its handling.

Source: Washington State Commercial Driver Guide — §§ 8.2–8.2.2, “Driving Tank Vehicles,” “High Center of Gravity,” and “Danger of Surge”

Question 5

What is the main function of baffles inside a liquid tank?

  1. A Increase the tank's legal cargo capacity
  2. B Control forward-and-back liquid surge
  3. C Eliminate all side-to-side surge
  4. D Provide expansion space for the liquid

Correct answer: B – Control forward-and-back liquid surge

Baffled tanks contain bulkheads with holes that allow liquid to flow through. This design helps control forward-and-back surge as the vehicle changes speed. Baffles do not prevent side-to-side surge, and that remaining movement can still contribute to a rollover.

Source: Washington State Commercial Driver Guide — § 8.2.4, “Baffled Tanks”

Question 6

A cargo tank used to transport milk is usually which type?

  1. A A baffled tank with perforated bulkheads
  2. B A compartmented tank with solid bulkheads
  3. C A baffled tank that prevents sideways surge
  4. D An un-baffled smooth bore tank

Correct answer: D – An un-baffled smooth bore tank

Milk and other food products are usually transported in un-baffled, or smooth bore, tanks because baffles are difficult to clean and sanitation regulations prohibit their use. With no internal structure to slow the liquid, forward-and-back surge is very strong. Drivers must use extra care, particularly when starting and stopping.

Source: Washington State Commercial Driver Guide — § 8.2.5, “Un-baffled Tanks”

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