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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. Before starting down a hill, you should slow down and shift down:
to a speed that you can control without using the brakes hard.
so you can coast downhill.
to a gear that will cause your engine to exceed its redline.
to a gear that will cause your brakes to overheat.
2. When driving past parked vehicles, you should:
turn on your taillights.
sound your horn.
stay close to the vehicles.
watch for clues that the parked vehicle is about to move.
3. When you are being tailgated, you should NOT:
turn on your taillights.
increase your following distance.
avoid quick changes.
All of the above.
4. When you are involved in an accident and not seriously hurt, you need to:
protect the area and notify authorities.
care for the injured.
collect required information and report the accident.
All of the above.
5. The most common cause of skidding is:
black ice.
driving too fast for conditions.
spilled oil.
surface water.
6. To make the brakes work, air brakes use:
compressed air.
hydraulic air.
carbon monoxide.
7. When driving on wet roads, you should:
reduce speed by 60%.
reduce speed by about one-third.
pull of the road and get some rest.
follow the vehicle ahead more closely than under ideal driving conditions.
8. To avoid distractions while driving, you should:
try to engage in complex conversations with the other occupants.
adjust vehicle controls and mirrors prior to driving.
smoke, eat, and drink only when the road is straight.
use your phone only when there is no traffic around you.
9. How can you tell if your vehicle is equipped with anti-lock braking system (ABS)?
Look for yellow ABS malfunction lamps on the instrument panel.
Trailers will have yellow ABS malfunction lamps on the left side.
Look under the vehicle for the wheel speed sensor wires coming from the back of the brakes.
All of the above.
10. Hydroplaning is more likely if:
the road is wet.
tire pressure is low.
tire tread is worn.
All of the above.
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TN CDL Knowledge Test

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