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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. When you inspect the front of your vehicle as part of the walk around inspection, you check all of the following EXCEPT:
the condition of the steering system.
the condition of the windshield.
the condition of your front axle.
the air pressure gauge.
2. Under a pressurized system, the radiator cap:
should always be cool.
should never be removed until the system has cooled.
should never be hot.
should be removed when the coolant is hot.
3. When approaching and driving through a work zone, you should:
observe the posted speed limits.
use your 4-way emergency flashers or brake lights to warn drivers behind you.
slow down.
All of the above.
4. When approaching a vehicle as part of a pre-trip inspection, which of the following could be a sign of trouble?
All of the above.
Inflated tires
Fresh oil under the vehicle
None of the above.
5. Empty vans are:
the same height as fully loaded ones.
higher than fully loaded ones.
lower than fully loaded ones.
None of the above.
6. To check the automatic transmission fluid:
you should turn the engine off.
the engine may have to be running.
you must go down grades.
the wheel nuts must be loose.
7. Overloading can have bad effects on all of the following except:
Speed control
Exhaust system
8. When transporting cargo, drivers:
should inspect the securement of the cargo only if they see problems that could cause a crash.
must inspect the securement of the cargo within the first 50 miles of a trip.
should not inspect the cargo within the first 50 miles of a trip.
must inspect the securement of the cargo within the first 150 miles of a trip.
9. When backing, it is best to:
try to back in the direction of the drift.
use only the passenger's side mirror.
use a helper whenever possible.
back toward the passenger's side when possible.
10. If you swing wide to the left before turning right:
you may damage the service brakes.
another driver may try to pass you on the left.
another driver may try to pass you on the right.
None of the above.
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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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