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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. Total stopping distance equals:
Perception distance + braking distance
Perception distance + reaction distance + braking distance
Reaction distance - following distance + braking distance
Braking distance + viewing distance
2. To prevent drowsiness before a trip, you should:
avoid medications that cause drowsiness.
drive with the windows rolled down.
avoid driving with a passenger.
drink 2 cups of coffee.
3. When only the tractor has ABS:
you should be able to maintain steering control during braking.
the trailer is less likely to swing out.
the ABS won't work.
there is a greater chance of jackknifing.
4. Suspension system defects include:
rust around wheel nuts.
cracked or broken spring hangers.
steering wheel play of more than 10 degrees.
All of the above.
5. If your truck has automatic transmission, you should downshift:
whenever road conditions allow.
when you need to accelerate.
after entering a curve.
when going down grades.
6. When checking the engine compartment in a vehicle inspection, you should check all of the following except:
Windshield washer fluid level
Engine oil level
Shock absorbers
Coolant level in radiator
7. Pre-trip inspections are:
required only for trips of more than 50 miles.
required by law
required only for trips of more than 100 miles.
8. Unless excepted, shipping papers must list:
the address of the driver.
a proper description of the truck.
an emergency response telephone number.
the colors of the materials.
9. Front brake limiting valves were used to:
reduce the chance of the front wheels skidding on slippery surfaces.
reduce your speed so further braking or shifting is not required.
prevent overheating of the front tires.
reduce exhaust emissions.
10. A passive railroad crossing is one that:
does not have any type of traffic control device.
has a traffic control device installed at the crossing to regulate traffic.
has at least two traffic control devices installed at the crossing to regulate traffic.
requires you to stop and wait until the traffic control device installed at the crossing tells you to proceed.
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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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