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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.
When driving on slippery roads, you should NOT:
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use the engine brake.
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try to anticipate stops early.
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go slowly.
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2.
Before driving a vehicle with a dual air brake system, you should allow time for the air compressor to build up a minimum of ____ pressure in both the primary and secondary systems.
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100 psi
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50 psi
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150 psi
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3.
You should always try to back toward the driver's side because:
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backing toward the left side is more dangerous.
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you can watch the rear of your vehicle out the side window.
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None of the above.
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4.
When you drive a tractor-trailer combination with ABS, you should:
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apply the trailer hand brake whe braking.
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pump the brakes.
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brake as you always have.
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5.
When driving on slippery surfaces, you should:
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change lanes often.
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make turns as quickly as possible.
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not pass slower vehicles unless necessary.
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6.
When the tractor protection valve closes, the trailer _______ brakes will come on.
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emergency
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parking
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service
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7.
If your trailer starts to skid, you should:
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steer in the opposite direction.
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release the brakes.
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pump the brakes.
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8.
In a vehicle with a dual air brake system:
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both systems typically operate the regular brakes on the rear axle.
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one system supplies air to the trailer.
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each system has its own air tanks.
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9.
You supply air to the trailer brake system by:
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connecting the tractor service air line to the trailer service glad hand.
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plugging the electrical cord into the trailer.
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pushing in the trailer air supply knob.
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10.
If your truck has automatic transmission, you should downshift:
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after entering a curve.
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whenever road conditions allow.
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when going down grades.
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