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CDL Tank Vehicles (N) Endorsement Test

Bulkheads and baffles: practice questions

Our CDL Tank Vehicles bank has 16 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

What kind of surge can still happen in a baffled tank?

  1. Front-to-back surge only
  2. Side-to-side surge
  3. None at all
  4. Only vertical surge
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B. Side-to-side surge — Side-to-side surge can still occur. This can cause a roll over (CDL Manual 8.2.4)

Question 2

How are baffles different from bulkheads?

  1. There is no difference between them
  2. Baffles have holes that let liquid pass; bulkheads form separate tanks
  3. Baffles are on the outside; bulkheads are inside
  4. Baffles only appear in gas tanks
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B. Baffles have holes that let liquid pass; bulkheads form separate tanks — Bulkheads divide the tank into smaller tanks; baffles are bulkheads with holes that let the liquid flow through (CDL Manual 8.2.3-8.2.4)

Question 3

Which products are usually carried in un-baffled tanks?

  1. Acids and corrosives
  2. Gasoline, diesel fuel and other fuels
  3. Food products such as milk
  4. Compressed gases
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C. Food products such as milk — Un-baffled tanks are usually those that transport food products (milk, for example) (CDL Manual 8.2.5)

Question 4

What do baffles help control?

  1. Expansion of the liquid
  2. Side-to-side surge
  3. Vapor pressure in the tank
  4. Forward and backward surge
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D. Forward and backward surge — The baffles help to control the forward and backward liquid surge (CDL Manual 8.2.4)

Question 5

Which federal tank topic covers the difference between baffled and smooth bore tanks?

  1. Stop arm and crossing control arm use
  2. Handling of baffled or compartmented tanks versus non-baffled tanks
  3. Passenger loading at the destination
  4. Converter dolly coupling methods
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B. Handling of baffled or compartmented tanks versus non-baffled tanks — 49 CFR 383.119(c): differences in handling of baffled/compartmented tank interiors versus non-baffled motor vehicles

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