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North Carolina CDL Permit Test - Combination

Number of questions: 25
Passing score: 20
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 25 multiple-choice questions, and applicants will need to correctly answer a minimum of 20 questions to pass. The Combination test is not a replacement for the Double/Triple endorsement test.
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5 or fewer errors
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1.

Emergency air lines are often coded with the color:

Green.
Orange.
Yellow.
Red.
2.

When you are pulling a trailer, the air supply control lever should be in its ____ position.

Emergency
Supply
Normal
3.

Which type of vehicle is most prone to the “crack-the-whip” effect?

A five-axle tractor semi-trailer
A three-axle tractor semi-trailer
A bobtail tractor
A triple trailer
4.

Older trailers are not equipped with spring brakes. This means that if the air supply for a vehicle's air braking system leaks away:

The trailer will stop normally.
The trailer will not have brakes.
The trailer will speed up.
5.

Trailers manufactured after ____ must be equipped with Anti-Lock Braking Systems (ABS).

1943
1998
2009
2015
6.

____ are the cause of more than half of all accident-related truck driver deaths.

Truck rollovers
Motorcycles
Slippery roads
Pedestrians
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