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Is located on the front of a trailer.
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|
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Is located on the instrument panel.
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Prevents air from escaping an air brake system.
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|
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Should always be open.
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Delaware CDL Permit Test - Combination
(From the 2021 Delaware CDL driver handbook)
| 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 State of Delaware 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.
Passing grade —
4 or fewer errors
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1.
A shut-off valve:
2.
If oil and water build up in your vehicle's air tanks, the brakes:
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May not work correctly.
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May feel squishy.
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Will squeal loudly when used.
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Will be extremely sensitive.
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3.
Proper coupling technique:
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Is the same on all vehicles.
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Is essential to the safe operation of a vehicle.
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Includes ensuring that the fifth wheel plate is not greased.
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Can be learned over time.
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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.
When backing up while coupling a trailer, the tractor should be positioned:
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Directly in front of the trailer.
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Directly next to the trailer.
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Parallel with the trailer.
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6.
When testing ____, you should apply your vehicle's brakes with the hand control while moving the vehicle forward slowly.
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The Anti-Lock Braking System
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The emergency braking system
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The trailer service brakes
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7.
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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