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Tank vehicles endorsement (N) practice test

30 free practice questions for this exam, each with the reason for the answer and where to look it up.

CDL endorsements: practice test

10 questions, graded as you go, with the reason for every answer. No sign-up.

Practice tests that prepare you for this exam

CDL endorsements

Hazardous materials, tank vehicles, doubles and triples, passenger and school bus endorsement knowledge tests.

30 questions for this exam

About the exam

ExamTank vehicles endorsement (N)
Who runs itState DMVs
WhereUnited States

Question count, time limit and pass mark differ by where you take it. Check the official candidate bulletin from the organisation that runs your exam.

Sample questions

What do bulkheads do in a liquid tank?

  1. Let liquid flow slowly between sections
  2. Strengthen it against outside impacts
  3. Vent vapors from the top of the load
  4. Divide it into separate smaller tanks
Show the answer

D. Divide it into separate smaller tanks

Solid bulkheads split the tank into separate compartments. The dividers that have holes to let liquid pass are baffles, which is the usual mix-up.

Reference: AAMVA CDL Manual, Section 8.2

Baffles in a liquid tank are:

  1. Bulkheads with holes that let liquid flow through
  2. Solid walls that seal one compartment from the next
  3. Relief valves that open when the liquid expands
  4. Outside rails that protect the valves in a rollover
Show the answer

A. Bulkheads with holes that let liquid flow through

Baffles are dividers with openings. The liquid can pass through, but its forward and backward movement is slowed. Solid walls are bulkheads, which create fully separate compartments.

Reference: AAMVA CDL Manual, Section 8.2

Which kind of surge can still cause a rollover in a baffled tank?

  1. Front-to-back surge
  2. Top-to-bottom surge
  3. Compartment surge
  4. Side-to-side surge
Show the answer

D. Side-to-side surge

Baffles run across the tank, so they slow forward and backward movement but do little to stop liquid shifting sideways. That sideways surge is what tips a tanker in a curve.

Reference: AAMVA CDL Manual, Section 8.2

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