|
Supply the trailer with air.
|
|
|
Deactivate the air brakes.
|
|
|
Prevent the vehicle from skidding.
|
Oklahoma CDL Permit Test - Combination
(From the 2020 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.
Rollovers happen when:
|
Drivers turn too quickly.
|
|
|
Drivers turn too slowly.
|
|
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It is raining.
|
3.
If a trailer begins to skid, it is best for the driver to:
|
Release the brakes.
|
|
|
Accelerate.
|
|
|
Quickly turn the steering wheel in one direction, then in the other.
|
4.
To find out if a vehicle that was built before 1998 has an Anti-Lock Braking System (ABS), you can:
|
Pump the air brakes to activate the ABS.
|
|
|
Look into the back of the fifth wheel.
|
|
|
Check for wheel speed sensors coming from the back of the brakes.
|
5.
Rearward amplification refers to:
|
The amount of noise projected to the rear of a vehicle.
|
|
|
The cause of the "crack-the-whip" effect.
|
|
|
The number of trailers that can be pulled by a tractor.
|
6.
When coupling a trailer, you should:
|
Couple together the proper glad hands.
|
|
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Couple glad hands with any other glad hands.
|
|
|
Leave one pair of glad hand loose.
|
7.
When glad hands are coupled, the seals should be pressed together at a ____ angle.
|
50-degree
|
|
|
180-degree
|
|
|
90-degree
|
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