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CDL Tank Vehicles (N) Endorsement Test

Endorsement rules: practice questions

Our CDL Tank Vehicles bank has 19 questions on this topic. Here are 5 of them with answers; the full mock exam draws from every topic, like the real one.

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Question 1

How is a cargo tank different from a portable tank?

  1. A cargo tank is filled off the vehicle and lifted on
  2. A cargo tank may never carry hazardous materials
  3. A cargo tank stays on the vehicle while it is loaded and unloaded
  4. A cargo tank is always smaller than 119 gallons
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C. A cargo tank stays on the vehicle while it is loaded and unloaded — Cargo tanks are permanently attached and remain on the vehicle when loaded and unloaded; portable tanks are loaded or unloaded off the vehicle (CDL Manual 9.5)

Question 2

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

  1. Only if the cargo is flammable, corrosive or poisonous by law
  2. Only if the vehicle has to display placards
  3. No, any liquid or gas in qualifying tanks counts
  4. Yes, only hazardous liquids or gases count
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C. No, any liquid or gas in qualifying tanks counts — The liquid or gas does not have to be a hazardous material (CDL Manual 8 intro)

Question 3

Which cargo tank does the manual name as the most common type for liquids?

  1. DOT 407
  2. MC338
  3. MC306
  4. MC331
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C. MC306 — The most common cargo tanks are MC306 for liquids and MC331 for gases (CDL Manual 9.5)

Question 4

Federal rules list what a tank applicant must know. Which topic is on that list?

  1. How to evacuate students through a roof hatch
  2. How to load cargo on a flatbed with tiedowns
  3. How road grade and curves affect handling with full, half-filled and empty tanks
  4. How to couple a converter dolly to a second trailer
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C. How road grade and curves affect handling with full, half-filled and empty tanks — 49 CFR 383.119(f): effects of road grade and curvature on handling with filled, half-filled and empty tanks

Question 5

When does the driver of a Class C vehicle need a tank endorsement?

  1. When it carries hazardous liquids or gases in tanks of the qualifying size
  2. Never, because tank endorsements only go on Class A licenses
  3. Whenever it carries any liquid, even water, in a tank
  4. Only when the tank is permanently welded to the frame
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A. When it carries hazardous liquids or gases in tanks of the qualifying size — A tank endorsement is also required for Class C vehicles used to transport hazardous materials in liquid or gas form in the described tanks (CDL Manual 8 intro)

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