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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
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1.
The emergency air line supplies air to the:
Relay valves.
Trailer air tanks.
Signal line.
2.
To prevent a trailer from rolling over, you should:
Speed up when nearing a corner.
Make sudden steering moves.
Take on-ramps faster than the posted speed limit.
Drive slowly around corners.
3.
Combination vehicles are usually:
Easier to drive than single commercial vehicles.
Lighter than single commercial vehicles.
More difficult to drive than single commercial vehicles.
4.
What is the tractor protection valve?
A valve that keeps air in the brake system should a bad leak occur
A valve that prevents the trailer from being accidentally released
A valve that prevents the vehicle from going too fast
5.
When driving a trailer with ABS, you should:
Not depress the brakes as much as you would when driving a vehicle without ABS.
Use extra braking force to ensure the ABS kicks in.
Brake as you would when driving a vehicle without ABS.
Try to not brakes as often as you would when driving a vehicle without ABS.
6.
Combination vehicles:
Often have taller trailers than single commercial vehicles.
Are usually lighter than single commercial vehicles.
Require more skill to drive than single commercial vehicles.
7.
The best way to recognize that your trailer has begun to skid is by:
Seeing other drivers' faces.
Seeing it in your mirrors.
Feeling it.
Listening to the radio.
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