COMBINATION TEST SOUTH CAROLINA - PRACTICE TEST
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Drivers who want to drive combination vehicles must pass the combination vehicles test. The South Carolina 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 South Carolina CDL Manual. Take this practice test now to prepare for the actual SC CDL combination test!
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1.
If the drive wheels start to skid:
accelerate slightly to regain control.
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use the brakes to slow down.
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push in the clutch to let them turn freely.
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All of the above.
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2.
Cargo should be properly covered:
to protect the weather from the cargo.
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to block your view or someone else’s.
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to protect people from spilled cargo.
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All of the above.
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3.
If your brakes get wet, it can cause them:
to be weak.
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to grab.
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to apply unevenly.
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All of the above.
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4.
Which of the following is not a reason for covering cargo?
To prevent other drivers from looking at the cargo
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To protect people from spilled cargo
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To protect the cargo from weather
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All of the above.
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5.
If your vehicle is equipped with air brakes, loss of air pressure in the
emergency line causes:
the speed of your vehicle to increase.
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the trailer spring brakes to come on.
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the trailer emergency brakes to come on.
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All of the above.
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6.
To test the tractor-semitrailer connection for security:
pull out the air supply knob.
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check that the trailer is locked onto the tractor by pulling the tractor gently forward while the trailer brakes are still locked.
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plug the electrical cord into the trailer and fasten the safety catch.
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go under the trailer and look into the back of the fifth-wheel.
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7.
The emergency air line does NOT:
supply air to the trailer air tanks.
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cause the tractor protection valve to close when the emergency line loses pressure.
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pump air into the relay valves, allowing the trailer brakes to be applied more quickly.
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control the emergency brakes on combination vehicles.
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8.
When backing a trailer, you should:
pull-up frequently to reposition the vehicle.
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not back up in a straight line.
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avoid braking.
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turn the steering wheel toward the direction you want to go.
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9.
If ABS is not working:
you should use the emergency brake.
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you will not have any brakes.
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you should use the parking brake.
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you will still have brakes.
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10.
When you have to back, you should always try to back toward the driver's side. Why?
You can watch the front of your vehicle by looking out the side window.
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You can see better and watch the rear of your vehicle by looking out the side window.
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Backing toward the left side is more dangerous.
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All of the above.
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SC CDL Combination Test
Number of questions: | 20 |
Correct answers to pass: | 16 |
Passing score: | 80% |
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