SC CDL COMBINATION 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!
1. Blocking and bracing are:
used to keep cargo from sliding and to prevent movement of cargo.
coupling devices used to connect the service air lines from the truck or tractor to the trailer.
driving techniques used to regain control when your drive wheels start to skid.
None of the above.
2. Before entering a curve, you should:
come to a complete stop.
increase your speed.
reduce your speed.
maintain your speed.
3. The proper following distance for a 60-foot vehicle traveling at 50 mph is:
7 seconds
4 seconds
8 seconds
6 seconds
4. A bridge formula permits:
less maximum axle weight for axles that are far apart.
less maximum axle weight for axles that are close together.
more maximum axle weight for axles that are closer together.
more maximum axle weight for axles that are far apart.
5. On a tractor-trailer equipped with a trailer brake hand valve, the hand valve can be used to:
keep from rolling back.
hold compressed air.
prevent movement of cargo.
reduce the chance of the front wheels skidding.
6. After a tire has been changed, the driver should stop a short while later to:
decrease tire pressure.
check the tightness of the nuts.
check tread separation.
deflate the tire to 10 psi.
7. You are driving a modern truck with a manual transmission. When going down a hill you should usually:
use a lower gear than would be required to go up the hill.
downshift after your speed has already built up.
use the same gear you would use to go up the hill.
shift into neutral and coast.
8. When a vehicle goes around a corner, the rear wheels:
follow the same path as the front wheels.
will turn freely.
follow a different path than the front wheels.
will lock up.
9. When backing a trailer on a curved path you should back towards:
neither side (back up straight).
the driver's side.
the passenger's side.
either side.
10. When should you use the hand valve to park a combination vehicle?
When parking downhill.
To park at loading docks.
Always.
Never.
 
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SC CDL Combination Test

Number of questions: 20
Correct answers to pass:16
Passing score:80%
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