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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 Tennessee hazmat test consists of 30 questions. To pass, you must correctly answer at least 24 questions (80%). The TN CDL hazmat test covers the information found in the Tennessee 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. With brake drums, if brakes become too hot:
the air compressor will kick on to cool the brakes.
your ABS will malfunction.
the brakes will supply too much power to the drive wheels.
the brakes may stop working.
2. During an en route inspection, you discover an overheated tire. You must:
lower the tires air pressure by at least 15 psi.
cool the tire and wait at least two hours before continuing your trip.
wait at least one hour before continuing your trip.
remove the tire and place it a safe distance from your vehicle.
3. When crossing railroad tracks, you should:
put the transmission in Neutral.
shift gears while crossing the tracks.
not stop.
try to pass slower vehicles.
4. When driving at night you should dim your lights when following another vehicle within:
1 mile.
500 feet.
100 feet.
50 feet.
5. If you have to drive off the road, you should:
brake as hard as you can to maintain control.
leave the road completely.
fully apply the brakes until your speed has dropped to about 20 mph.
keep one set of wheels on the pavement, if possible.
6. To obtain the HazMat endorsement, you must pass a ________ background check.
Law Enfrocement Agency
Federal Bureau of Investigation
Transportation Security Administration
Local Department of Security
7. Passive railroad crossings:
should never be crossed using a CMV.
do not have traffic control devices.
usually have a person directing traffic.
have at least one traffic control device.
8. How often should you check the tires if your placarded trailer has dual tires?
Once a year.
At the beginning of each trip and each time the vehicle is parked.
Once a month.
Once every 12 hours.
9. When your drive wheels have poor traction, you should:
only use the retarder on the front wheels.
turn the retarder on.
turn the retarder off.
only use the retarder on the rear wheels.
10. Which of the following hazard classes bears a "transport index" in order to determine how much of it can be loaded on a single vehicle for transport?
Class 7 (Radioactive Materials)
Class 3 (Flammable Liquids)
Class 8 (Corrosive Liquids)
Class 1 (Explosives)
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Hazmat CDL Test (TN)

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