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The tanker endorsement applies to drivers who wish to drive a tank in Class A, B, or C CDL. To add this endorsement to your CLP/CDL, you must pass a knowledge test on the problems posed by large volume liquid cargos. The Iowa CDL tank vehicles test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The IA tanker test covers the following sections of the Iowa CDL Manual: Driving Safely, Combination Vehicles, Tank Vehicles, Hazardous Materials. Take this IA tanker practice test now to prepare for the actual test!
1. Truck tractors with air brakes built after March 1, 1997, are required to be equipped with:
hydraulic brakes.
a rear backup camera.
anti-lock brakes.
2. If the "Hazard Class" or "Division" column of the Hazardous Material Table contains the word "Forbidden", you should:
never transport the "Forbidden" material.
be aware that the load may require a police escort.
transport the "Forbidden" material at night.
3. Smooth bore tanks:
have bulkheads in them with holes to limit the flow of liquid.
have nothing inside to slow down the flow of liquid.
have bulkheads with holes to let the liquid flow through.
4. Which of the following statements about tank vehicles is true?
Baffled liquid tanks have bulkheads in them with holes that let the liquid flow through.
Hauling liquids in tanks requires special skills because of the low center of gravity.
Baffled liquid tanks have nothing inside to slow down the flow of the liquid.
5. Empty trucks:
stop quicker when you use only the emergency or parking brake.
require greater stopping distances than full trucks.
have more traction than full trucks.
6. Warnings on low bridges or underpasses:
are often posted, but sometimes they are not.
are always posted.
must be posted.
7. When driving in hot weather, drivers should inspect tires:
every 4 hours or every 200 miles.
every 3 hours or every 75 miles.
every 2 hours or every 100 miles.
8. A full tank of dense liquid (such as some acids) may:
weigh less than a tank filled with other liquids.
be subject to travel restrictions.
exceed legal weight limits.
9. When approaching a stopped school bus, drivers must be aware that:
the bus may suddenly start up and drive into your way.
students may start to get out of the bus.
All of the above.
10. When loading and unloading smaller tanks with bulkheads, the driver must pay attention to:
weight distribution.
the shipping papers.
safe driving rules.
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IA CDL Tanker Endorsement

Number of questions: 20
Correct answers to pass:16
Passing score:80%
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