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Supply the trailer with air.
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Deactivate the air brakes.
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Prevent the vehicle from skidding.
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Oklahoma CDL Permit Test - Combination
(From the 2021 Oklahoma 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 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
advertising
1.
Pushing in the trailer air supply control will:
2.
Rearward amplification refers to:
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The amount of noise projected to the rear of a vehicle.
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The cause of the "crack-the-whip" effect.
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The number of trailers that can be pulled by a tractor.
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3.
To find out if a vehicle that was built before 1998 has an Anti-Lock Braking System (ABS), you can:
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Pump the air brakes to activate the ABS.
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Look into the back of the fifth wheel.
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Check for wheel speed sensors coming from the back of the brakes.
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4.
If a trailer begins to skid, it is best for the driver to:
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Release the brakes.
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Accelerate.
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Quickly turn the steering wheel in one direction, then in the other.
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5.
When coupling a trailer, you should:
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Couple together the proper glad hands.
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Couple glad hands with any other glad hands.
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Leave one pair of glad hand loose.
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6.
Rollovers happen when:
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Drivers turn too quickly.
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Drivers turn too slowly.
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It is raining.
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7.
When glad hands are coupled, the seals should be pressed together at a ____ angle.
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50-degree
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180-degree
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90-degree
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