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Cargo weight must be evenly distributed between all trailers.
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The heaviest trailer should be positioned directly behind the cab.
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The heaviest trailer should be positioned in the rear.
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The weight of the trailers does not matter.
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Oregon CDL Permit Test - Combination
(From the 2020 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.
In a double or triple combination:
2.
Older trailers are not equipped with spring brakes. This means that if the air supply for a vehicle's air braking system leaks away:
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The trailer will stop normally.
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The trailer will not have brakes.
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The trailer will speed up.
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3.
What is a bobtail tractor?
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A tractor without a semi-trailer
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|
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A tractor with two semi-trailers
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A tractor that travels faster than the speed limit
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4.
An air supply control lever should be in its "normal" position when you are:
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Changing a tire.
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Applying the trailer emergency brakes.
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Pulling a trailer.
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Using your spring brakes.
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5.
To prevent a rollover, cargo should be:
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Placed near the front of a trailer.
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Placed near the rear of a trailer.
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Spread out on a trailer.
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Loaded with most weight on the driver’s side of a trailer.
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6.
Watching the road ahead:
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Is more dangerous than only watching your mirrors.
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Does not help you drive more safely.
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Can help you avoid the need for sudden lane changes.
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7.
The trailer hand valve should:
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Be used for parking.
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Be used only to test the trailer brakes.
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Be used together with the brake pedal.
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Be used on slippery surfaces.
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