illinois
CDL Practice Test

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Welcome to the Illinois CDL Practice Test site. This is a free site and you are able to take the tests as a study guide as you prepare for the Illinois CDL test. The topics covered in these practice tests are taken from the Illinois CDL book. You will be presented with 40 questions and you must answer 34 questions correctly to pass. There is a 50-minute time limit. You may not go back once you answer a question. Click the "Start Test" button below to begin. 

1 / 40

Is this statement true or false: You do not need to use the parking brake if are leaving your vehicle for a short amount of time.

2 / 40

How should the pintle hook be when backing a dolly under the second trailer?

3 / 40

What is the normal operating range for a truck's oil pressure?

4 / 40

Cylinders containing compressed gases may only be loaded onto a vehicle without a flat floor or platform if the cylinders are:

5 / 40

Select the statement that describes smooth bore tanks:

6 / 40

What product is typically carried in a liquid tank trailer without baffles?

7 / 40

When approaching railroad tracks, stop your bus:

8 / 40

After deciding the type of evacuation that is necessary, the next step you must take is:

9 / 40

What is the next step after securing the bus when you have an unruly child on board?

10 / 40

At a railroad crossing, the bus is required to stop at the stop line. If there is no clearly marked stop line, what is the required minimum and maximum stopping distance?

11 / 40

Students exit the bus and walk:

12 / 40

The gauge that indicates normal or increasing lubrication pressure to prevent engine seizure, failure or breakdown is:

13 / 40

You should adjust all the outside left and right side flat mirrors to see:

14 / 40

Where should the safety catch for the fifth wheel locking lever be located for coupling to be complete?

15 / 40

Select the statement that best describes what the trailer air supply control does:

16 / 40

Which of the following is a necessary qualification for non-bulk packaging?

17 / 40

Spring brakes are usually held back by_____during normal driving.

18 / 40

Select the true statement in regards to converter dollies:

19 / 40

This gauge has a governor cut-off.

20 / 40

Select the true statement about converter dollies:

21 / 40

There should be ___space between the upper and lower fifth wheel after coupling.

22 / 40

Which trailer is most likely to turn over when you make a sudden turn while pulling doubles?

23 / 40

You should place the starter switch key into your pocket while you are performing the pre-trip inspection because:

24 / 40

You need to raise the landing gear just to the height of where it clears the pavement before driving.

25 / 40

What is a king pin?

26 / 40

Select when you should use the hand valve to park a combination vehicle.

27 / 40

Select the true statement in regards to large combination vehicles taking longer to stop.

28 / 40

When there is a hazardous materials emergency. You should:

29 / 40

You should decrease to a safe speed before entering a curve and then_____through it.

30 / 40

When accelerating:

31 / 40

A driver of a tanker should use an escape ramp when _____.

32 / 40

On tandem axle for trailers, the sliding mechanism and locking device is:

33 / 40

Select the factor that has no effect on how much liquid you can carry:

34 / 40

If your bus has an emergency exit door, it must:

35 / 40

On the Hazardous Materials Table, column 1 shows:

36 / 40

What is the brake system that applies and releases the brakes when the brake pedal is used?

37 / 40

Select the vehicle that off-tracks the most.

38 / 40

Which of the following are possible causes of tire fires?

39 / 40

When you have a major leak in the service line and put on the brake, the service air pressure will escape and cause the:

40 / 40

Placarded vehicles must carry which type of fire extinguisher?

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CDL Category Practice Tests

CDL Practice Test

How To Get An illinois Commercial Drivers License

Applicants can apply for their CDL and any endorsements they wish at the age of 21 years old. Those under the age of 21, but over the age of 18 are eligible to receive an in-state only CDL. Those under 21 are not eligible for driving hazmat vehicles or transporting passengers. All applicants must supply a Department of Transportation (DOT) medical certificate and pass the CDL vision test in order to be qualified to receive their CDL. All applicants are required to pass a vision test, knowledge test(s), and a practical skills assessment in order to be considered for a CDL license.

Any applicant that is described by any of the sentences below is considered disqualified from getting their CDL.

  • A driver that has their commercial driving privileges revoked in another state.
  • Any driver convicted of driving impaired in a commercial vehicle in the past 24 months.
  • A driver that possess more than one driver’s license.
  • Any driver whose license is currently denied, canceled, suspended, or revoked.

Endorsements
L – Air Brake Restriction
X – Combination
P – Passenger
C – Charter Bus
T – Doubles/Triples
H – Hazardous Materials
S – School Bus
N – Tank

Hit the Open Road

illinois CDL License Test Tips

The written exam or knowledge test is required of all CDL applicants. This exam is comprised of 50 specific questions about commercial driving. Those applying for endorsements must complete an additional knowledge test for that endorsement. These tests are between 20 and 30 questions. Those who are applying for a Class A CDL must complete an additional 20 questions about combination vehicles. All knowledge tests must be passed with a grade of 80 percent or more for an applicant to receive their CDL permit.

The Illinois CDL skills assessment must be completed by an applicant. Each assessment includes a pre-trip inspection, basic control skills, and on-road driving test. The on-road driving test includes real-life driving instances, such as low clearance bridges, downgrading for a stop, increasing gears, curves, expressways, and other instances. These are mean to ensure the applicant is fully capable of driving a commercial vehicle safely.

Additional Information

Information on the Office of the Illinois Secretary of State

The Office of the Illinois Secretary of State is responsible for the administration of the CDL requirements and testing in Illinois. To get more information contact them via:

Website:  https://www.cyberdriveillinois.com/departments/drivers/drivers_license/CDL/cdl.html

Phone:  800.252.8980

 

Additional Illinois CDL Helpful Links

Please use the links below to access more valuable Illinois CDL testing resources and to learn more about practice driving tests for the state of Illinois.