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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 you try to couple when the trailer is too low:
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it might not couple correctly.
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the tractor may strike and damage the trailer nose.
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the tractor could roll away.
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All of the above.
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2.
If during vehicle inspection a tire is too hot to touch, you should:
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immediately decrease air pressure.
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make sure there is enough engine oil on the tires.
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remain stopped until the tire cools off.
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let air out.
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3.
After a tire has been changed, the driver should stop a short while later to:
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check the tightness of the nuts.
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check tread separation.
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deflate the tire to 10 psi.
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decrease tire pressure.
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4.
When driving trucks with trailers, drivers should:
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push the brake pedal to the floor when braking.
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decrease their following distance.
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avoid making sudden movements with the steering wheel.
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make quick lane changes.
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5.
You are driving on a steep downgrade in the proper low gear. Your "safe" speed is 40 mph. When your speed reaches 40 mph, you should:
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apply the brakes to quickly reduce your speed to 25 mph, and then release the brakes.
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apply the brakes to gradually reduce your speed to 35 mph, and then release the brakes.
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maintain your current speed, and apply the brakes when you reach 50 mph to gradually reduce your speed to 40 mph.
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increase your speed to approximately 45 mph, and then apply release the brakes.
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6.
You should use chocks when parking a trailer without spring brakes because:
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the brakes will hold only as long as there is air pressure in the trailer air tank.
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it helps prevent brake failure.
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it helps prevent skids.
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it is required by law.
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7.
A steering wheel should have no more than _____ of play. If there is more play than this, it may be hard to steer.
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15 degrees
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It doesn't matter.
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30 degrees
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10 degrees
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8.
If you cannot make a right turn without entering another traffic lane, you should:
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watch out for vehicles coming toward you and back up for them.
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turn wide before you start the turn.
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swing wide to the left before starting the turn.
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turn wide as you complete the turn.
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9.
When the tractor protection valve closes, the trailer _______ brakes will come on.
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hand
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service
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emergency
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parking
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10.
When checking the air and electric lines to the trailer, be sure that the air lines are properly connected to the gland hands, and are:
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secured with enough slack for turns.
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secured with enough air leaks for turns.
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properly greased.
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None of the above.
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