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Nebraska 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 Nebraska 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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Passing grade —
5 or fewer errors
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1.
Trailers with low underneath clearance can present challenges when driving over:
Bridges.
Railroad tracks.
Overpasses.
2.
The ____ trailer is the most likely to turn over if a driver takes a turn too quickly.
Front
Last
Middle
3.
Place the trailer air supply control in its "emergency" position to test:
The trailer emergency brakes.
A coupling device.
The anti-lock brakes.
4.
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
5.
How many air lines does a combination vehicle have?
One
Two
Three
Four
6.
When entering or crossing traffic while driving a combination vehicle, it is especially important that you:
Sound your horn.
Make sure there is a large enough gap for your vehicle.
Expect other drivers to make room for your vehicle.
Let other drivers wave you into their lane.
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