Denison High School

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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. When stopping with a tanker, you must be aware that:
a fully loaded vehicle requires a greater stopping distance because it has less traction.
the amount of liquid in the tank has no influence on the stopping distance.
a fully loaded vehicle takes less room to stop than an empty vehicle.
2. Which of the following is true? If a HazMat is a Poison Inhalation Hazard:
the material will have special requirements for shipping papers.
a POISON INHALATION HAZARD placard must be used in addition to other placards.
All of the above.
3. If your brakes fail on a steep mountain downgrade, you should:
decide what to do as soon as you know your brakes do not work.
slow down until your vehicle comes to a complete stop.
stay on the road and keep looking for the next available escape ramp.
4. Which of the following is not a sign of fatigue?
Rubbing eyes
Keeping a steady speed
Frequent blinking
5. Drivers of vehicles transporting HazMat should:
compare the shipping paper to the markings and labels.
ensure that all packages are labeled as flammable materials.
ensure that all relevant placards are carried in the passenger compartment.
6. To keep your vehicle from rolling back when you start, you should:
turn the engine off before you take your foot off the brake.
apply the emergency brake whenever necessary.
partly engage the clutch before you take your foot off the brake.
7. If your placarded trailer has dual tires, you should check the tires:
at the beginning of each trip and each time the vehicle is parked.
once every 500 miles.
once every 3 months.
8. You should always adjust your speed to be able to stop within:
50 feet.
the length of your vehicle.
the distance you can see ahead.
9. Fully loaded rigs:
are much more likely to roll over than empty rigs.
are just as likely to roll over as empty rigs.
are less likely to roll over than empty rigs.
10. Retarders:
improve gas mileage.
reduce braking distance.
help slow a vehicle, reducing the need for using brakes.
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IA CDL Tanker Test

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