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Oregon CDL Permit Test - Combination

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.
You have made error so far
Passing grade —
4 or fewer errors
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1.
In a double or triple combination:
Cargo weight must be evenly distributed between all trailers.
The heaviest trailer should be positioned directly behind the cab.
The heaviest trailer should be positioned in the rear.
The weight of the trailers does not matter.
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:
The trailer will stop normally.
The trailer will not have brakes.
The trailer will speed up.
3.
What is a bobtail tractor?
A tractor without a semi-trailer
A tractor with two semi-trailers
A tractor that travels faster than the speed limit
4.
An air supply control lever should be in its "normal" position when you are:
Changing a tire.
Applying the trailer emergency brakes.
Pulling a trailer.
Using your spring brakes.
5.
To prevent a rollover, cargo should be:
Placed near the front of a trailer.
Placed near the rear of a trailer.
Spread out on a trailer.
Loaded with most weight on the driver’s side of a trailer.
6.
Watching the road ahead:
Is more dangerous than only watching your mirrors.
Does not help you drive more safely.
Can help you avoid the need for sudden lane changes.
7.
The trailer hand valve should:
Be used for parking.
Be used only to test the trailer brakes.
Be used together with the brake pedal.
Be used on slippery surfaces.
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