|
Prevent air from escaping air brake systems.
|
|
|
Prevent air from entering air brake systems.
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|
|
Override vehicles that are out of control.
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Louisiana CDL Permit Test - Combination
(From the 2020 Louisiana 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.
Shut-off valves:
2.
If a load is placed on one side of a trailer, the trailer:
|
May lean during turns.
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|
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May add extra support during turns.
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|
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May be easier to steer during turns.
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3.
Older trailers are not equipped with spring brakes. This means that if the air supply for a vehicle's air braking system leaks away:
|
The trailer will stop normally.
|
|
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The trailer will not have brakes.
|
|
|
The trailer will speed up.
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4.
If you are backing and become unsure about your path of travel, you should:
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Continue backing.
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|
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Stop and get out to look.
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|
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Continue backing, but more slowly than before.
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5.
The trailer hand valve should not be used while you are driving because:
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It will disconnect from the vehicle.
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|
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You will stop the vehicle too quickly.
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|
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It can cause a skid.
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6.
Fully-loaded rigs:
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Are less likely to roll over than empty rigs.
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|
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Are more likely to roll over than empty rigs.
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|
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Are just as likely to roll over as empty rigs.
|
7.
Rollovers happen when:
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You drive too slowly.
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|
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You are stopped.
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|
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You take a turn too fast.
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