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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. Your vehicle has air brakes. To stop, you should:
release the accelerator, push in the clutch, and shift to Neutral at the same time.
push the brake pedal down.
pull the parking brake control knob out.
2. The amount of liquid to load into a tank depends on:
the weight of the liquid.
the amount the liquid will expand in transit.
All of the above.
3. Rollovers happen when drivers:
turn too fast.
brake too hard.
turn too slowly.
4. You are more at risk of being fatigued:
after getting more than 8 hours of sleep.
when stopping periodically during long trips.
when driving alone.
5. Brake lag is:
the distance your vehicle will travel, in ideal conditions, while you are braking.
the time required for the air brakes to work after the brake pedal is pushed.
the amount of air pressure required to stop the vehicle.
6. Improperly placarded vehicles can only be moved:
during an emergency.
at night.
by their owner.
7. If you experience a loss of hydraulic pressure, you should do all of the following except:
Pump the brakes
Put the transmission in Neutral
8. A high center of gravity is most dangerous:
when driving below the speed limit.
when the tank is empty.
in curves.
9. With low beams, drivers can see ahead about:
100 feet
15 feet
250 feet
10. If coolant has to be added to a system without a recovery tank, you should:
wait until the engine has cooled before adding coolant.
turn the radiator cap quickly to the first stop.
keep the engine running while adding coolant.
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IA CDL Tanker Test

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