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A “crack-the-whip” effect, resulting in a rollover.
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A trailer to straighten out.
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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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Oregon CDL Permit Test - Combination
(From the 2021 Oregon 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 Oregon Commercial Driver 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.
Simply changing lanes can cause:
2.
In a vehicle equipped with an automatic tractor protection valve, the valve will pop out when air pressure drops to a level between:
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20 and 45 psi.
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75 and 105 psi.
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50 and 65 psi.
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3.
An air supply control in its "emergency" position will:
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Turn on the air supply.
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|
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Apply the trailer emergency brakes.
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Prevent a skid.
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Accelerate the vehicle.
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4.
When backing a trailer, you must turn the steering wheel:
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In the direction you want the trailer to move.
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In the direction opposite of where you want the trailer to move.
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To the left until backing is complete.
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5.
More than half of all accident-related truck driver deaths are caused by:
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Rollovers.
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|
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Slippery roads.
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Other drivers.
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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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Are just as likely to roll over as empty rigs.
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Should not be driven.
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7.
When driving a vehicle equipped with an Anti-Lock Braking System (ABS), brakes should be applied:
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In the same way as they would be in a vehicle without ABS.
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|
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As the vehicle is placed in neutral.
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With the hand brake.
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