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It is a square blue knob.
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It is a triangular yellow knob.
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It is an eight-sided red knob.
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It is a circular orange knob.
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Nebraska CDL Permit Test - Combination
(From the 2021 Nebraska CDL driver handbook)
| 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.
Passing grade —
5 or fewer errors
advertising
1.
What does the trailer air supply control look like?
2.
After finishing a pre-trip inspection, you should:
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Leave the rear shut-off valves open.
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Remove the service line valve.
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Close the emergency line valve.
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Leave the emergency line valve open.
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3.
When traveling more slowly than 40 mph, maintain at least ____ of following distance per every 10 feet of your vehicle.
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One second
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Two seconds
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Three seconds
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Four seconds
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4.
Using the trailer hand brake while experiencing a trailer jackknife will:
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Stop the skid.
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Straighten the trailer.
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Increase traction.
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Continue the skid.
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5.
The ____ trailer is the most likely to turn over if a driver takes a turn too quickly.
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Front
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Last
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Middle
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6.
The best way to notice if a trailer has begun to skid is to:
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Ask another driver.
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Use your mirrors to determine if the trailer has left the lane.
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Look at the skid sensor.
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Feel the tractor move.
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