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CDL Tank Vehicles (N) Endorsement Test

Inspecting tank vehicles: practice questions

Our CDL Tank Vehicles bank has 29 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

Which valves does the manual tell you to check on a tank vehicle?

  1. Only the fuel tank vent valve
  2. Only the air tank drain valves on the tractor
  3. Intake, discharge and cut-off valves
  4. Only the radiator drain valve
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C. Intake, discharge and cut-off valves — Check the intake, discharge and cut-off valves (CDL Manual 8.1.1)

Question 2

When should the liquid discharge valves on a compressed gas tank be open?

  1. Whenever the vehicle is parked
  2. Whenever the tank is less than half full
  3. Only when loading and unloading
  4. During the whole trip, to relieve pressure
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C. Only when loading and unloading — Keep liquid discharge valves on a compressed gas tank closed except when loading and unloading (CDL Manual 9.5.4)

Question 3

Why inspect a tanker before loading it?

  1. To be sure it is safe to carry the liquid or gas and safe to drive
  2. To decide which of the possible routes has the lowest tolls
  3. To find out how much the load is worth
  4. To check that the shipper has paid
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A. To be sure it is safe to carry the liquid or gas and safe to drive — Inspection makes sure the vehicle is safe to carry the liquid or gas and is safe to drive (CDL Manual 8 intro)

Question 4

How close must the person watching a hazmat cargo tank being loaded stay to the tank?

  1. Within 100 feet
  2. Within 25 feet
  3. Within 10 feet
  4. Within 50 feet
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B. Within 25 feet — The person watching the loading or unloading must be within 25 feet of the tank (CDL Manual 9.5.2)

Question 5

What must you do with the loading and unloading connections before moving a cargo tank?

  1. Tie them to the rear bumper
  2. Leave them on but closed
  3. Unhook only the vapor line
  4. Unhook all of them
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D. Unhook all of them — Unhook all loading/unloading connections before coupling, uncoupling or moving a cargo tank (CDL Manual 9.5.4)

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