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Drivers who want to drive combination vehicles must pass the combination vehicles test. The Oregon 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 Oregon CDL Manual. Take this practice test now to prepare for the actual OR CDL combination test!
1.
In your mirror, you see a car approaching from the rear. The next time you check your mirror, you don't see the car. If you wish to change lanes, you should:
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wait until you are sure the car isn't in your blind spot.
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assume the car left the roadway and change lanes as normal.
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ease into the other lane slowly so the other car can get out of the way.
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None of the above.
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2.
When uncoupling a trailer, after shutting off the trailer air supply to lock the trailer brakes, you should:
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back up gently to ease the pressure on the fifth-wheel locking jaws.
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pull the tractor forward until the fifth-wheel comes out from under the trailer.
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inspect the trailer supports.
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immediately apply your tractor parking brakes.
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3.
If you feel drowsy while driving, what should you do?
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Eat heavy foods.
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Turn on the radio to keep you awake.
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Pull off the road and get some sleep.
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Get an energy drink.
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4.
How can you tell if a converter dollie has ABS?
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There is a yellow lamp on the left side of the dolly.
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There is an ABS plaque on the right side of the dolly.
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There is an ABS system on the right side of the dolly.
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There is a red lamp on the left side of the dolly.
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5.
Which of the following is most likely to roll over?
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The rear trailer of a double
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The middle trailer of a triple
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The rear trailer of a triple
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The front trailer of a double
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6.
When a vehicle goes around a corner, the rear wheels:
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follow the same path as the front wheels.
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follow a different path than the front wheels.
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will lock up.
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will turn freely.
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7.
When driving with cargo, you should re-check the cargo and securing devices as often as necessary to keep the load secure, and inspect again:
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every 3 hours or 150 miles.
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every day.
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every 30 minutes or 50 miles.
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every 6 hours or 300 miles.
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8.
After starting the engine, oil pressure should rise to a normal level:
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within 6 minutes.
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within 2 minutes.
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within 3 miles.
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within seconds.
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9.
When coupling, you should:
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make sure the sliding fifth-wheel is locked.
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make sure the trailer kingpin is bent.
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be aware that wrong coupling and uncoupling can be very dangerous.
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make sure the trailer wheels are not chocked.
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10.
As you approach off ramps and on ramps, remember:
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to always brake and turn at the same time.
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to maintain your highway speed.
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that downgrades make it easier to reduce speed.
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that the posted speed limit may not be safe for larger vehicles.
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