Free Oregon CDL Combination Vehicles Practice Test 2023

You have to pass the Oregon CDL combination vehicles endorsement to get ready for propelling your career with your license. You are looking for a good Oregon CDL Practice Test source for your coming CDL test? You are in the right place. Our practice test is a great resource for beginners. The test is designed for you to have exactly the experience of the exam as you will be more familiar with both the test format and the subject. Our CDL practice test covers topics ranging from combination vehicle maintenance to safely driving a complex rig. Each question is based on the official Oregon CDL manual so you can be sure that the information in our test is accurate and relevant to your examination. In addition, each question has a detailed explanation so that it is very useful for you to learn from your mistakes. Preparing well before test day with questions and content that we cover. Start with our Free Oregon CDL Combination Vehicles Practice Test today and walk out with your endorsement!

Our CDL practice tests:
Based on 2021 OR commercial driver's license manual
Full answers + detailed explanations
Perfect for first-time, renewal applicants
OR CDL Combination Vehicles Test format:
20 questions
16 correct answers to pass
80% passing score
List of questions
To prevent moisture from entering the electrical cable when disconnected:
A tractor with a _______ trailer, requires the most amount of stopping distance.
The air leakage rate for a combination vehicle (engine off, brakes on) should not be more than _____ psi per minute.
To unlock the fifth wheel, the locking lever should be placed in the ______ position.
The iron trailer supports are up and the trailer is resting on the tractor. Make sure:
After you supply air to the trailer, make sure the air lines are not crossed and the trailer brakes are working. This is done by:
When uncoupling, make sure that the parking area:
Compared to a straight truck or bus, there are ______ things to inspect in combination vehicles.
To help prevent rollover, keep the center of gravity of the load as low as possible, and:
When coupling, trailer height should:
The emergency air line controls the emergency brakes on combination vehicles, and:
A driver crosses the air lines when hooking up to an old trailer. What will happen?
Trailers will have an ABS malfunction lamp:
When parking trailers without spring brakes, it is very important to:
Trailer landing gear:
The "rearward amplification" value means:
Air and electrical lines from the tractor to the trailer should be:
If you cannot complete your turn without entering another traffic lane you should:
You are coupling a tractor to the semitrailer; you have connected the airlines. Before backing under the trailer, you should:
Where should the tractor be when you inspect the landing gear after uncoupling the trailer?