Oregon CDL Combination Test 1

Question 1

When backing a trailer, you must turn the steering wheel:

In the direction you want the trailer to move. In the direction opposite of where you want the trailer to move. To the left until backing is complete.

Correct Answer:

In the direction opposite of where you want the trailer to move.

Question 2

In a vehicle equipped with an automatic tractor protection valve, the valve will pop out when air pressure drops to a level between:

20 and 45 psi. 75 and 105 psi. 50 and 65 psi.

Correct Answer:

20 and 45 psi.

Question 3

An air supply control in its "emergency" position will:

Turn on the air supply. Apply the trailer emergency brakes. Prevent a skid. Accelerate the vehicle.

Correct Answer:

Apply the trailer emergency brakes.

Question 4

Fully-loaded rigs:

Are less likely to roll over than empty rigs. Are more likely to roll over than empty rigs. Are just as likely to roll over as empty rigs. Should not be driven.

Correct Answer:

Are more likely to roll over than empty rigs.

Question 5

Simply changing lanes can cause:

A “crack-the-whip” effect, resulting in a rollover. A trailer to straighten out. Confusion over which lane the driver is hoping to use. Other drivers to reduce their speed.

Correct Answer:

A “crack-the-whip” effect, resulting in a rollover.

Question 1 of 20

Exam overview

About this Exam

Prepare with the Oregon CDL Combination Test 1 practice quiz. This question bank includes 20 questions covering trailer, valve, emergency, line, and vehicle. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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Oregon CDL Combination Test 1

This practice set contains 20 questions from the matching question bank and focuses on trailer, valve, emergency, line, and vehicle. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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About this Exam

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Oregon CDL Combination Test 1

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