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Drivers who want to drive combination vehicles must pass the combination vehicles test. The Ohio 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 Ohio CDL Manual. Take this practice test now to prepare for the actual OH CDL combination test!
1.
The best way to recognize that your trailer has started to skid is:
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by recognizing tire failure.
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by feeling the brakes come on.
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by seeing it in your mirrors.
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2.
Containerized loads:
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are generally used for freight carried part way by rail or ship.
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should exceed gross weight and axle weight limits.
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must be inspected before and after the trip.
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3.
If you discover a fire, before opening trailer doors you should:
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have a helper open the doors.
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use the fire extinguisher on the doors.
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feel the doors to see if they are hot.
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4.
Before leaving your vehicle unattended, you should:
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Apply the parking brake.
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Remove the keys.
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All of the above.
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5.
Hanging meat in a refrigerated truck can be:
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a very unstable load with a high center of gravity.
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a very unstable load with a low center of gravity.
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a very stable load if properly distributed.
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6.
If a vehicle is equipped with ABS, when you start the engine:
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the spring brakes will come on.
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the ABS indicator light on the dash should come on and then turn off.
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the wheels will lock up.
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7.
With brake drums, if brakes become too hot:
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the brakes will supply too much power to the drive wheels.
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the brakes may stop working.
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your ABS will malfunction.
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8.
When you make a quick lane change, the crack-the-whip effect can turn the trailer over. The crack-the-whip effect is caused by:
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strong wind.
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the rear trailer of a triple.
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rearward amplification.
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9.
When backing with a trailer, you should:
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check your mirrors on both sides frequently.
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look at your line of travel before you begin backing.
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All of the above.
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10.
The center of gravity of a trailer should be:
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as low as possible.
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at the rear of the trailer.
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as high as possible.
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