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South Carolina CDL Permit Test - Combination

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.
You have made error so far
Passing grade —
4 or fewer errors
When connecting a converter dolly to a second trailer, the trailer height should be ____ the center of the fifth wheel.
Level with
Slightly higher than
Slightly lower than
To prevent a rollover, cargo should be:
Loaded with most weight on the driver’s side of the trailer.
Placed near the rear of the trailer.
Spread out in the trailer.
A combination vehicle has ____ air line(s).
When glad hands are coupled, the seals should be pressed together at an angle of:
30 degrees.
45 degrees.
60 degrees.
90 degrees.
The emergency air line supplies air to the:
Relay valves.
Trailer air tanks.
Signal line.
What happens when the wheels of a trailer lock up?
The trailer will usually continue to move in a straight line.
The trailer will disengage.
The trailer will likely swing around.
The trailer will stop.
What is a bobtail tractor?
A tractor without a trailer
A tractor attached to two trailers
A tractor with a tank
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