CDL Tank Tank Types and Construction

Question 1

For endorsement purposes, which description best fits a vehicle that needs a tank vehicle (N) endorsement?

Accepted Answer

A vehicle hauling a tank with an individual rated capacity over 119 gallons and an aggregate rated capacity of 1,000 gallons or more

Answer

Under federal rules, a tank vehicle carries liquid or gas in tanks with an individual rated capacity over 119 gallons and an aggregate rated capacity of 1,000 gallons or more. The tank may be permanently or temporarily attached.

Question 2

A driver hauls several portable tanks on a flatbed. Each tank has a rated capacity of 100 gallons, and together they hold 1,200 gallons. Under the federal definition, is this a tank vehicle?

Accepted Answer

No, because no individual tank is rated over 119 gallons

Answer

Both conditions must be met. Each tank must be rated over 119 gallons and the aggregate must be 1,000 gallons or more. Here the individual tanks are only 100 gallons.

Question 3

What is the main purpose of baffles inside a tank?

Accepted Answer

To slow the liquid's forward-and-back surge

Answer

Baffles are walls with holes in them. They let liquid pass through but slow its forward-and-back movement.

Question 4

How does a bulkhead differ from a baffle?

Accepted Answer

A bulkhead divides the tank into separate compartments, while a baffle has holes that let liquid pass through

Answer

Bulkheads divide a tank into separate compartments, and liquid cannot flow between them. Baffles have holes that let liquid pass through while slowing its movement.

Question 5

Which tank design has no baffles or bulkheads inside and allows the most liquid surge?

Accepted Answer

Smooth bore tank

Answer

A smooth bore tank has nothing inside to slow the liquid, so surge is greatest. Its interior is also easy to clean.

CDL Tank Practice Test

CDL Tank Practice Test

CDL Tank Tank Types and Construction