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Any driver, regardless of the vehicle Class, who wants to haul hazardous materials, must add an “H” endorsement to their CDL. In order to obtain the Hazmat endorsement drivers are required to pass a Transportation Security Administration background check and a knowledge test. The District of Columbia hazmat test consists of 30 questions. To pass, you must correctly answer at least 24 questions (80%). The DC CDL hazmat test covers the information found in the District of Columbia CDL Manual. Study the chapter covering hazardous materials to learn how to recognize, handle, and transport Hazmat, then take this practice test to prepare for your exam!
1. How can you tell if your vehicle is equipped with ABS?
Look for yellow ABS malfunction lamps on the instrument panel.
Look under the vehicle for the wheel speed sensor wires coming from the back of the brakes.
Trailers will have yellow ABS malfunction lamps on the left side.
All of the above.
2. If corrosive materials leak during transportation, the parts of the vehicle exposed to corrosives must:
be washed with acid.
be left to air dry.
be washed with oil.
be washed with water.
3. Your vehicle has hydraulic brakes. When you press the brake pedal while driving and the pedal goes to the floor, remember that:
the parking brake should never used to slow the vehicle.
pumping the brake pedal may generate enough hydraulic pressure to stop the vehicle.
shifting into neutral may help slow the vehicle.
All of the above.
4. If a shipping paper describes both hazardous and non-hazardous products, the hazardous materials must be:
in the same color as the non-hazardous materials.
listed in yellow ink.
highlighted in a contrasting color.
listed at the bottom.
5. After an accident, an improper use of flares could cause:
the vehicle to slide back and forth.
air pressure to build from 50 to 100 psi within 2 minutes.
the springs to put on the brakes.
a fire if spilled fuel is on the ground.
6. If the vehicle ahead of you is smaller than yours:
it will take the same amount of time to stop.
it can probably stop faster than you can.
it will usually take longer to stop.
All of the above.
7. The best advice for driving in fog is:
use high beams.
don't drive.
drive slowly in the left lane of traffic.
use low beams.
8. A driver distraction is anything that takes your attention away from driving, such as:
adjusting the radio.
All of the above.
9. Your engine runs a pump used during delivery of compressed gas. After product transfer, you should:
turn off the engine before you unhook the hose.
turn off the engine while you unhook the hose.
turn off the engine after you unhook the hose.
leave the engine on while you unhook the hose.
10. A person attending a placarded parked vehicle:
must know what to do in emergencies.
must be able to move the vehicle, if needed.
must be in the vehicle, awake, or within 100 feet of the vehicle, and have the vehicle within clear view.
All of the above.
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DC CDL Hazmat Test

Number of questions: 30
Correct answers to pass:24
Passing score:80%
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