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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. On a tractor-trailer equipped with a trailer brake hand valve, the hand valve can be used to:
reduce the chance of the front wheels skidding.
prevent movement of cargo.
hold compressed air.
keep from rolling back.
2. Texting is:
safer than talking on a cell phone.
safer than  engaging in conversation with a passenger.
about as safe as adjusting the radio.
the most dangerous distraction.
3. Whether or not you load and secure your load yourself, you are responsible for:
knowing your cargo is properly secured.
recognizing overloads and poorly balanced weight.
inspecting your cargo.
All of the above.
4. When a vehicle goes around a corner, the rear wheels:
follow a different path than the front wheels.
will lock up.
follow the same path as the front wheels.
will turn freely.
5. In some states, move-over laws require drivers to:
obey the directions given by police officers at railroad crossings.
submit to a chemical test to determine their BAC when requested by a peace officer.
slow and change lanes when approaching a roadside incident.
All of the above.
6. If the air pressure gets too low:
you should set the parking brake.
ABS will help maintain vehicle control.
the brakes will lock up.
the brakes will not work.
7. The 2 special conditions where you should downshift are:
Before starting up a hill and after finishing a curve.
Before starting up a hill and before finishing a curve.
Before starting down a hill and before entering a curve.
While going down hill and after finishing a curve.
8. Name some exhaust system parts.
Mufflers, mounting brackets and vertical stacks
Drag link, spindle and gear box
Pitman arm, hydraulic fluid reservoir and tie rod
Main spring, axle and font axle hanger
9. When you take a break in the middle of your trip, you should check:
tires, brakes, lights and cargo securement devices.
gauges for signs of trouble.
missing exhaust pipes.
heater, defroster and windshield wiper blades.
10. Who is responsible for making sure the lights and reflectors are clean?
The driver
The previous driver
The shipper
The maintenance staff
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IL CDL Practice 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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