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The CDL general knowledge test is required to be taken by all CDL applicants. The Illinois 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 Illinois 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 IL 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. Poor weight balance:
increases fuel efficiency.
can make vehicle handling more difficult.
improves handling.
makes it easier to turn.
2. When you discover a fire, if the trailer doors are hot you should not open them because:
the temperature of the trailer should not be changed in any way.
you should use the fire extinguisher on the door.
opening the doors lets air in and may make the fire flare up.
with air many fires do less damage.
3. When you get in the vehicle and start the engine, you should:
make sure the parking brake is on before starting the engine.
listen for unusual noises after starting the engine.
put the gearshift in neutral (or park if automatic) before starting the engine.
All of the above.
4. What is a "header board"?
A safety device that protects you from your cargo in case of an accident.
The back door of the cargo compartment.
Another term for the brake camshaft.
The pressure gauge connected to the air tank.
5. Hydroplaning:
can occur at speeds as low as 10 mph, if there is a lot of water.
can occur at speeds as low as 30 mph.
is less likely if tire pressure is low.
can occur only if there is a lot of water on the road.
6. Service lines are often coded with the color ____ to keep from getting them mixed up with the emergency line.
7. If you're carrying hazardous materials and are stopped at a truck stop, you should:
tuck the shipping papers under your windshield wiper.
leave the shipping papers in the driver’s door pouch or on the driver’s seat.
keep the shipping papers with you.
leave the shipping papers on the dashboard in clear view.
8. When you park, you should try to park:
on the shoulder of the road.
so there is enough room to back out.
so you'll be able to pull forward when you leave.
None of the above.
9. After the first stop, drivers must inspect the securement of the cargo:
every 250 miles or every five hours.
every 50 miles or every hour.
every 100 miles or every two hours.
every 150 miles or every three hours.
10. The one-way check valve:
keeps air from going out if the air compressor develops a leak.
keeps the axles in place.
keeps your wheels from locking up when you brake hard.
supplies air to the trailer air tanks.
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CDL Knowledge Test IL

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