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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. The header board, if equipped, should:
not be used in case of a crash or emergency stop.
can be dangerous.
block the forward movement of any cargo you carry.
never be used for cargo.
2. When a combination vehicle goes around a corner:
the driver must keep the rear of your vehicle far away from the curb.
the rear wheels of the trailer will never off-track.
the front and rear wheels follow a different path.
All of the above.
3. When the spring brakes are on, you should never:
push the brake pedal down.
decrease your speed.
change lanes.
4. Brake fade results from:
excessive speeding.
excessive wear.
excessive use of the service brakes.
excessive smoke.
5. Which of the following is NOT TRUE?
You should regularly inspect the contents of sealed loads.
In many states, spill protection for covered cargo is a requirement.
You should check that you don't exceed gross and axle weight limits.
You should cover cargo to protect it from the weather.
6. For safety during a trip, you should:
watch gauges for signs of trouble.
use your senses to check for problems.
check critical items when you stop.
All of the above.
7. When making a turn you should:
make gestures to get the attention of other drivers.
signal early.
turn the signal off before entering the turn.
honk your horn.
8. If you recognize a distracted driver on the road, you should:
follow them closely.
flash your brake lights at them.
try to pass them.
give them plenty of room.
9. Skids caused by acceleration can usually be stopped by:
taking your foot off the accelerator.
swerving to the right.
applying the brakes firmly.
swerving to the left.
10. Hazardous materials placards are:
Signs put on the outside of a vehicle that identify the hazard class and weight of the vehicle.
Signs put on the outside of a vehicle to warn others of hazardous materials.
Signs put on top of a vehicle that identify the hazard class of the cargo.
None of the above.
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IL CDL Knowledge Test

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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