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A tractor without a semi-trailer
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A tractor with two semi-trailers
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A tractor that goes faster than the speed limit
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A tractor that goes slower than the speed limit
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South Dakota CDL Permit Test - Combination
(From the 2020 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
advertising
1.
What is a bobtail?
2.
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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3.
Combination vehicles are usually:
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Easier to drive than single commercial vehicles.
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Lighter than single commercial vehicles.
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More difficult to drive than single commercial vehicles.
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4.
Using the trailer hand valve while driving:
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Will help you turn safely.
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Will stop your trailer safely.
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Can cause a skid.
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Is impossible.
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5.
Fully-loaded rigs:
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Are less likely to roll over than empty rigs.
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Are more likely to roll over than empty rigs.
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Are just as likely to roll over as empty rigs.
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Should not be driven.
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6.
If unsure if a trailer has an Anti-Lock Braking System (ABS), you can:
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Look under the trailer for wheel speed sensors coming from the back of the brakes.
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Remove a tire and look for the ABS sensor on the axle.
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Assume it does have ABS.
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7.
When entering or crossing traffic while driving a combination vehicle, it is especially important that you:
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Sound your horn.
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Make sure there is a large enough gap for your vehicle.
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Expect other drivers to make room for your vehicle.
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Let other drivers wave you into their lane.
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