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Will help you turn safely.
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|
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Will stop your trailer safely.
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|
|
Can cause a skid.
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|
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Is impossible.
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District Of Columbia CDL Permit Test - Combination
(From the 2020 District Of Columbia 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 have one hour to correctly answer a minimum of 16 questions. The Combination test is not a replacement for the Double/Triple endorsement test.
Passing grade —
4 or fewer errors
advertising
1.
Using the trailer hand valve while driving:
2.
Avoid needing to make sudden lane changes by:
|
Using your horn to encourage other drivers to move out of your lane.
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|
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Only driving slower than the posted speed limit.
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Watching the road ahead while driving.
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Pulling off the road and waiting when there is high traffic.
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3.
Driving a combination vehicle ____ than driving a single vehicle.
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Is easier
|
|
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Requires more driving skill
|
|
|
Is better for training
|
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Is safer in inclement weather
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4.
Simply changing lanes can cause:
|
A “crack-the-whip” effect, resulting in a rollover.
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|
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A trailer to straighten out.
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|
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Confusion over which lane the driver is hoping to use.
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Other drivers to reduce their speed.
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5.
The trailer hand valve should:
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Be used for parking.
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|
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Be used only to test the trailer brakes.
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|
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Be used together with the brake pedal.
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|
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Be used on slippery surfaces.
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6.
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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|
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A bobtail tractor
|
|
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A triple combination
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7.
Using the trailer hand brake while experiencing a trailer jackknife will:
|
Stop the skid.
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|
|
Straighten the trailer.
|
|
|
Increase traction.
|
|
|
Continue the skid.
|
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