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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 District of Columbia CDL tank vehicles test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The DC tanker test covers the following sections of the District of Columbia CDL Manual: Driving Safely, Combination Vehicles, Tank Vehicles, Hazardous Materials. Take this DC tanker practice test now to prepare for the actual test!
1. Your mirrors should be adjusted so that:
more than half of the mirror shows the vehicle.
the rear of the vehicle is visible in the mirror.
no part of the vehicle is visible in the mirror.
a part of the vehicle is visible in the mirror.
2. How should you brake if your vehicle loses ABS?
Pump the brake repeatedly
Brake as you always have.
Stay off the Brake
Step on and off the brake pedal several times
3. Air brakes use ________ to make the brakes work.
compressed gas cylinders
compressed gases
compressed air
compressed oil
4. When fueling a vehicle containing hazardous materials, you should:
turn off the engine.
leave the nozzle unattended.
leave the engine on.
call your supervisor.
5. A person attending a placarded parked vehicle:
must be able to move the vehicle, if needed.
must know what to do in emergencies.
must be in the vehicle, awake, or within 100 feet of the vehicle, and have the vehicle within clear view.
All of the above.
6. If you must drive slowly, how should you alert following drivers?
Help them out by signaling when it is safe to pass
Turn on your taillights
Flash your brake lights
Use your emergency flashers if it is legal
7. Hauling liquids in tanks requires special skills because of:
liquid movement.
a greater chance of rollover.
the high center of gravity.
All of the above.
8. Emergency brakes are:
required on all vehicles.
not required on buses.
not required on commercial vehicles with air brakes.
not required on doubles.
9. Brake fade results from:
using brakes in cold weather.
wet brakes.
excessive heat caused by using brakes too much.
All of the above.
10. Under a pressurized system, the radiator cap:
should never be hot.
should never be removed until the system has cooled.
should be removed when the coolant is hot.
should always be cool.
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DC CDL Tanker Test

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