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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. Black ice:
is a thin layer that is clear enough that you can see the road underneath it.
is thick enough that it makes the road look dry.
is thick enough that it makes the road look wet.
None of the above.
2. You should always be able to stop within:
the distance you can see ahead.
25 feet.
50 feet.
100 feet.
3. Under-loaded front axles can:
cause the drive wheels to spin easily.
cause poor traction.
make the steering axle weight too light to steer safely.
All of the above.
4. If your vehicle begins to hydroplane, you should:
immediately pull off the road.
release the accelerator and push in the clutch.
brake gently to slow down.
accelerate slightly.
5. Which of the following statements about stopping distance is true?
Braking distance is the distance your vehicle will travel, in ideal conditions, while you are braking.
Perception distance is the distance your vehicle travels, in ideal conditions, from the time your eyes see a hazard until your brain recognizes it.
Reaction distance is the distance you will continue to travel, in ideal conditions, before you hit the brakes.
All of the above.
6. _________ are used on many vehicles to provide extra gears.
Retarders and multi-speed rear axles
Auxiliary transmissions and power steering cylinders
None of the other answers is correct.
Multi-speed rear axles and auxiliary transmissions
7. To calculate how much space you should keep in front of you:
count off the seconds until you pass a pavement marking, or some other clear landmark.
count off the seconds from when the vehicle ahead of you passes some clear landmark to when you reach that same landmark.
add 4 seconds for each 10 feet of vehicle length at speeds below 40 mph.
count off the seconds until you reach the vehicle ahead.
8. Empty trucks require greater stopping distances because:
fully loaded trucks have less traction.
they are usually equipped with power brakes.
empty vehicles have less traction.
All of the above.
9. Fully loaded trucks require greater stopping distances than empty vehicles. True or False?
True, but only on wet surfaces.
True, but only if the truck was built after 1998.
10. After a tire has been changed, you should:
stop a short while later and check that the nuts are tight.
deflate the tire to 15 psi.
decrease tire pressure.
wait at least 30 minutes before driving.
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CDL Knowledge Test TN

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