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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.
Blocking _______________ to keep it from sliding.
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goes from the upper part of the cargo to the floor
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is used only in the back of a piece of cargo
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is used in the front, back, and/or sides of a piece of cargo
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None of the above.
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2.
The emergency air line does NOT:
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control the emergency brakes on combination vehicles.
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supply air to the trailer air tanks.
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pump air into the relay valves, allowing the trailer brakes to be applied more quickly.
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cause the tractor protection valve to close when the emergency line loses pressure.
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3.
If your ABS is not working:
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the drive wheels will begin to spin, and you should take your foot off the accelerator.
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it will slow your truck to a halt and force you to pull over.
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you should immediately bring your vehicle to a complete stop.
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you still have normal brake functions, and should drive and brake as you always have.
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4.
How many red reflective triangles should you carry?
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5
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2
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3
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6
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5.
If you begin to feel drowsy while driving, you should:
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open your window.
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get an energy drink.
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pull off the road and get some rest.
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get some coffee.
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6.
What is countersteering?
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Turning the steering wheel quickly the other way after steering in an emergency situation.
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Driving too fast for conditions.
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Locking your wheels while turning in an emergency situation.
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Staying off the brake while steering to the right to avoid an accident.
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7.
What is the proper following distance for a 50 foot truck traveling at 50 mph?
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6 seconds
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25 seconds
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5 seconds
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10 seconds
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8.
Combination vehicles usually require _________ single commercial vehicles.
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less driving skill than
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the same level of skill as
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more driving skill than
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None of the above.
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9.
When more cargo is piled up in a truck, the center of gravity moves:
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closer to the ground.
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higher up from the road.
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to the right side of the truck.
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to the left side of the truck.
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10.
After supplying air to the trailer brake system, you should check the brake system for crossed air lines by:
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applying and releasing the trailer brakes and listening for the sound of trailer brakes.
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shutting the engine off so you can hear the brakes.
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checking the air brake system pressure gauge for signs of major air loss.
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All of the above.
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