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Drivers who want to drive combination vehicles must pass the combination vehicles test. The Illinois CDL combination test consists of 20 questions, and you'll need at least 16 correct answers to pass (80%). The test covers the combination vehicles section of the Illinois CDL Manual. Take this practice test now to prepare for the actual IL CDL combination test!
1. If your cargo only fills one-third of the length of your trailer, make sure your cargo is:
piled up high with heavy cargo on top.
to one side and as close to the ground as possible.
loaded so there is a high center of gravity.
centered and spread out as much as possible.
2. If loose or missing, _______ may cause movement between the frame and fifth wheel assembly.
locking pins
safety chains
electric connectors
mounting bolts
3. The posted speed limit:
should never be exceeded.
is only a suggestion.
should only be exceeded when passing other vehicles.
may only be exceeded when driving in rural areas.
4. The center of gravity of a trailer should be:
at the front of the trailer.
as high as possible.
as low as possible.
at the rear of the trailer.
5. You have two tie-downs on a 15 foot load. How many more tie-downs do you need to secure cargo and keep it from shifting or falling?
6. When using a fire extinguisher, you should stay:
as close to the fire as possible, without getting burnt.
as far away from the fire as possible.
at least 10 feet away from the fire.
at whatever distance you think is safe.
7. Which of the following is NOT a way to determine if your trailer is equipped with ABS (antilock braking system)?
Wheel speed sensor wires are coming from the back of the brakes.
The letters "ABS" are printed on the side of the steering wheel.
It was built after March 1, 1998.
It has yellow ABS malfunction lamps.
8. If you're feeling tired while driving you should:
eat something.
increase your speed to get to your destination quicker.
stop driving and get some rest.
drink coffee.
9. You are driving a modern truck with a manual transmission. When going down a hill you should usually:
use a lower gear than would be required to go up the hill.
use the same gear you would use to go up the hill.
downshift after your speed has already built up.
shift into neutral and coast.
10. When driving on slippery surfaces, you should:
make turns as quickly as possible.
change lanes often.
not pass slower vehicles unless necessary.
All of the above.
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IL CDL Combination Test

Number of questions: 20
Correct answers to pass:16
Passing score:80%
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