CDL DOUBLES PRACTICE TEST SOUTH CAROLINA
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Safely pulling double and triple trailers requires knowledge and skill. If you want to pull double or triple trailers, you must add the Doubles/Triples (T) endorsement to your Class A CDL. The South Carolina doubles triples test consists of 20 questions. To pass, you must correctly answer at least 16 questions (80%). The SC CDL doubles triples test covers the following sections of the South Carolina CDL Manual: Driving Safely, Air Brakes (if you plan to operate vehicles equipped with air brakes), Combination Vehicles, Doubles and Triples. Take this SC CDL practice test now to prepare for the actual test!
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1.
ABS helps you:
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drive faster.
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stop faster.
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brake harder.
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None of the above.
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2.
When backing a trailer, you should turn the steering wheel to the right to make the trailer go left (or vice versa). Once the trailer starts to turn, you should:
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keep backing up.
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turn the wheel the other way to follow the trailer.
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turn the wheel more in the direction you want to go.
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None of the above.
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3.
How far ahead do most good drivers look?
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3 to 4 seconds
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6 to 8 seconds
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50 to 60 seconds
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12 to 15 seconds
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4.
Too little weight on the driving axles can cause:
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mechanical damage.
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poor traction.
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poor visibility.
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longer stopping distances.
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5.
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 opening the window and feeling the front of the mirror.
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by seeing it in your mirrors.
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6.
When you double your speed, the braking distance is:
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3 times longer.
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2 times longer.
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the same.
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4 times longer.
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7.
If a trailer does not have spring brakes, to keep the trailer from moving you should:
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park on a slight decline.
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close the brake valve.
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use wheel chocks.
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use the service brakes.
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8.
Hanging meat in a refrigerated truck can be:
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a very stable load with a low center of gravity.
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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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9.
If you experience a loss of hydraulic pressure, you should do all of the following except:
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Pump the brakes
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Use the parking brake
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Put the transmission in Neutral
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Downshift
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10.
To make the brakes work, air brakes use:
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hydraulic air.
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carbon monoxide.
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nitrogen.
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compressed air.
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SC CDL Doubles Triples Test
| Number of questions: | 20 |
| Correct answers to pass: | 16 |
| Passing score: | 80% |
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