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The parking brake.
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The trailer emergency brakes.
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The trailer service brakes.
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The landing gear.
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South Dakota CDL Permit Test - Combination
(From the 2021 South Dakota 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
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1.
Pull out the trailer air supply control to test:
2.
Rollovers are most likely to happen when:
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Drivers turn too fast.
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Driver turn too slowly.
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It is windy.
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It is raining.
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3.
All trailers made after ____ must be equipped with Anti-Lock Braking Systems (ABS).
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1943
|
|
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1998
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|
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2009
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4.
Push in the trailer air supply control to:
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Activate the emergency brakes.
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Deactivate the air brakes.
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Sound the horn.
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Supply the trailer with air.
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5.
Which of the following types of vehicles is most prone to the “crack-the-whip" effect?
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An automobile
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A three-axle tractor
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A bobtail tractor
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A triple combination
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6.
What is another name for the service line?
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The control line
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The utility line
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The open line
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The parallel line
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7.
A trailer that is too high:
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May not couple correctly.
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Will couple securely.
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Is not an issue.
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