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Illinois CDL Practice Exam
Practice mode
Question
1
of 25
QUESTION 1 / 25
When commandeering a trailer, what should a driver always check?
Choose one answer below.
A
The fuel level of the towing vehicle
✓
B
The coupling and security of the trailer hitch and safety chains
✓
C
The color of the trailer for visibility
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D
The weight of the trailer cargo
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QUESTION 2 / 25
What is the purpose of using a seat belt in a commercial vehicle?
Choose one answer below.
A
To improve comfort
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B
To protect the driver and passengers in an accident
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C
To avoid traffic violations
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D
To maintain vehicle stability
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QUESTION 3 / 25
In what situation would a driver typically close the shut-off valves in the air lines at the back of a trailer?
Choose one answer below.
A
When overloading the trailer
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B
When unhooking the trailer
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C
When driving downhill
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D
When accelerating quickly
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QUESTION 4 / 25
What is a common penalty for not following CDL regulations?
Choose one answer below.
A
Free vehicle maintenance
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B
Increased fuel efficiency
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C
Fines and potential suspension of the CDL
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D
Promotion within the driving company
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QUESTION 5 / 25
When encountering a steep downhill grade, what action should a driver take?
Choose one answer below.
A
Shift to a higher gear
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B
Apply brakes continuously
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C
Use engine braking or lower gears
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D
Ignore the slope and maintain speed
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QUESTION 6 / 25
What color is typically associated with the emergency air lines in a trailer's air system?
Choose one answer below.
A
Blue
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B
Red
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C
Green
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D
Yellow
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QUESTION 7 / 25
What is the maximum number of hours a driver may drive in a single day without rest?
Choose one answer below.
A
10 hours
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B
12 hours
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C
8 hours
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D
11 hours
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QUESTION 8 / 25
In adverse weather conditions, how should a driver adjust their speed?
Choose one answer below.
A
Increase speed
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B
Maintain current speed
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C
Reduce speed and increase following distance
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D
Speed up when possible
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QUESTION 9 / 25
Which emergency equipment must be kept in vehicles according to regulations?
Choose one answer below.
A
Extra fuel
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B
Food rations
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C
Warning devices like reflective triangles
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D
First-aid kit
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QUESTION 10 / 25
What is the main purpose of a truck's engine brake?
Choose one answer below.
A
To reduce fuel consumption
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B
To provide additional braking power, especially on downhill slopes
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C
To assist in starting the vehicle on an incline
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D
To maintain a constant speed on flat terrain
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QUESTION 11 / 25
Which of the following is a requirement for obtaining a CDL?
Choose one answer below.
A
High school diploma
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B
Pass a vision test
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C
Hold a regular driver's license
✓
D
All of the above
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QUESTION 12 / 25
Which type of valve in the air brake system protects the tank and the system from too much pressure by opening at around 150psi?
Choose one answer below.
A
Safety Valve
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B
Service Brake Valve
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C
Air Compressor Governor Valve
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D
Emergency Brake Valve
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QUESTION 13 / 25
Which action should be taken if a tire blows out while driving a commercial vehicle?
Choose one answer below.
A
Immediately steer to the shoulder of the road
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B
Maintain direction and gradually slow down
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C
Brake hard to prevent losing control
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D
Speed up to decrease the chance of flipping
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QUESTION 14 / 25
What does a seatbelt do in the event of an accident?
Choose one answer below.
A
Prevents the vehicle from starting
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B
Protects the driver and passengers from being thrown from the vehicle
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C
Decreases the stopping distance of the vehicle
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D
Increases comfort during long drives
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QUESTION 15 / 25
What is the minimum distance a CDL driver should signal before making a turn?
Choose one answer below.
A
At least 50 feet before the turn
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B
At least 100 feet before the turn
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C
At least 150 feet before the turn
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D
At least 200 feet before the turn
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QUESTION 16 / 25
How far ahead should a driver look while operating a vehicle?
Choose one answer below.
A
8-10 seconds
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B
10-12 seconds
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C
12-15 seconds
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D
15-20 seconds
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QUESTION 17 / 25
How far must you stop from a stopped school bus with its stop sign extended?
Choose one answer below.
A
At least 10 feet
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B
At least 15 feet
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C
At least 20 feet
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D
At least 25 feet
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QUESTION 18 / 25
How can improper weight distribution affect a vehicle?
Choose one answer below.
A
It can improve fuel efficiency
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B
It can create excessive tire wear and affect handling
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C
It ensures better road grip
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D
It generally has no effect on performance
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QUESTION 19 / 25
In Illinois, how many questions are typically on the CDL written exam?
Choose one answer below.
A
30 questions
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B
40 questions
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C
50 questions
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D
60 questions
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QUESTION 20 / 25
What is the maximum weight that can be carried on a tandem axle according to the regulations?
Choose one answer below.
A
20,000 pounds
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B
34,000 pounds
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C
50,000 pounds
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D
80,000 pounds
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QUESTION 21 / 25
How much space should you keep in front of you according to Illinois CDL standards?
Choose one answer below.
A
1 second for each 10 feet of vehicle length at speeds under 40mph
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B
2 seconds for each 20 feet of vehicle length at all speeds
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C
3 seconds for every 30 feet of vehicle length at all speeds
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D
As little space as possible
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QUESTION 22 / 25
How often should a driver check their mirrors while driving?
Choose one answer below.
A
Only during turns
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B
At regular intervals and when necessary
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C
Only during the initial part of the trip
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D
Once every 10 minutes
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QUESTION 23 / 25
How often should cargo be inspected during a trip?
Choose one answer below.
A
After driving for one hour
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B
Within the first 100 miles
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C
After every break taken during driving
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D
At the end of the trip only
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QUESTION 24 / 25
How do S-cam brakes function in an air braking system?
Choose one answer below.
A
By pumping air into each brake chamber
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B
By rotating the foundation brakes
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C
By twisting the brake camshaft using air pressure
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D
By manually engaging the brake shoes
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QUESTION 25 / 25
How can a commercial driver minimize the risk of accidents in inclement weather?
Choose one answer below.
A
By driving at the posted speed limit regardless of conditions
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B
By adjusting their speed and increasing their following distance
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C
By using cruise control
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D
By not driving at all
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