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South Carolina CDL Permit Test - Combination
(From the 2021 South Carolina CDL driver handbook)
| Number of questions: | 20 |
| Passing score: | 16 |
Directions:
All applicants who are applying for a Class A CDL should be prepared to take the Combination test. This test covers information found in Section 6 of the Commercial Driver License Manual. Section 6 provides the information needed to safely operate tractor-trailers, doubles, triples, and straight trucks with trailers. The test is made up of 20 multiple-choice questions, and applicants will need to correctly answer a minimum of 16 questions to pass. The Combination test is not a replacement for the Double/Triple endorsement test.
Passing grade —
4 or fewer errors
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1.
A combination vehicle has ____ air line(s).
2.
What is a bobtail tractor?
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A tractor without a trailer
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A tractor attached to two trailers
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A tractor with a tank
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3.
What happens when the wheels of a trailer lock up?
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The trailer will usually continue to move in a straight line.
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The trailer will disengage.
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The trailer will likely swing around.
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The trailer will stop.
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4.
When glad hands are coupled, the seals should be pressed together at an angle of:
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30 degrees.
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45 degrees.
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60 degrees.
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90 degrees.
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5.
To prevent a rollover, cargo should be:
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Loaded with most weight on the driver’s side of the trailer.
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Placed near the rear of the trailer.
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Spread out in the trailer.
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6.
The emergency air line supplies air to the:
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Relay valves.
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Trailer air tanks.
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Signal line.
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7.
When connecting a converter dolly to a second trailer, the trailer height should be ____ the center of the fifth wheel.
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Level with
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Slightly higher than
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Slightly lower than
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