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The CDL general knowledge test is required to be taken by all CDL applicants. The Tennessee CDL test consists of 50 questions. To pass, you must correctly answer at least 40 questions (80%). The general knowledge test covers the contents of the Tennessee CDL Manual. All CDL applicants (Class A, B and C) must study the following sections: Driving Safely, Transporting Cargo Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Vehicle Inspection Test, Basic Control Skills Test, Road Test. In addition, the Class A CDL test will include questions based on the Combination Vehicles section. Take this CDL practice test now to prepare for the actual TN general knowledge test! To get your CDL, you must pass both the knowledge and skills tests. CDL knowledge tests include: General Knowledge, Passenger Transport, Air Brakes, Combination Vehicles, Hazardous Materials, Tanker Vehicles, Doubles/Triples, School Bus, Firefighter. Depending on what class of license (A, B or C) and endorsements you need, you must take one or more knowledge tests. A special endorsement is also required to drive certain types of vehicles. The following endorsements may be used with a Class A, B or C CDL: HazMat (H), Tank Vehicles (N), Tank Vehicles Transporting Hazardous Materials (X) and Passenger Transport (P). The School Bus endorsement (S) is only available for Class A or B CDL, and the Doubles/Triples endorsement (T) is only available for Class A driver's licenses.
1. To prevent drowsiness before a trip, drivers should:
prepare the route carefully, including stopping points.
get at least 5 hours of sleep.
drive alone.
drive at night.
2. When going down a hill, you should downshift:
as you go downhill.
after starting down a hill.
before you start going downhill.
at the bottom of the hill.
3. Antifreeze:
helps the engine only under hot conditions.
doesn't help the engine in any way.
helps the engine only when the temperature is below freezing.
helps the engine under hot conditions as well as cold conditions.
4. Which of the following statements about driving in cold weather is true?
An engine cannot overheat when the weather is very cold.
Exhaust system leaks are less dangerous in cold weather.
You should use windshield washer antifreeze.
Brakes will never fade or fail from excessive heat caused by using them too much.
5. Which of the following is not part of the air brake system?
Air compressor
Air storage tanks
Air filter
Alcohol evaporator
6. If you are driving a 50 foot truck and you are traveling at 55 mph, you should have at least _________ of following distance.
6 seconds
12 seconds
3 seconds
5 seconds
7. Placards are used to:
indicate the maximum speed that the vehicle can travel.
indicate the maximum speed that the vehicle can reach on a level road.
identify the hazard class of the cargo.
warn the public to stay at least 500 feet away from the vehicle.
8. The emergency equipment must include:
3 red reflective triangles
Electrical Fuses
Charged and rated fire extinguisher
All of the above.
9. When using double clutching to shift gears, if you are having difficulty putting the vehicle into the next gear you should:
prevent the transmission from shifting up beyond the selected gear.
reduce the engine speed to drop back to the previous gear.
return to neutral, release the clutch, increase the engine speed to match the road speed, and try again.
force the lever until you put the vehicle into the next gear.
10. When should you sound your horn?
When you are being tailgated by an aggressive driver.
When you are about to change lanes.
When steering around an obstacle.
When using your horn can help avoid an accident.
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TN CDL Knowledge Test

Number of questions: 50
Correct answers to pass:40
Passing score:80%
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