Combination #2
Combination Vehicles Practice Test | Oregon 2025 #2
Train for FREE online with our Oregon CDL combination vehicle test. The official exam test consists of several obligatory parts, with all of them checking your knowledge of different blocks of road rules. If you need to obtain a OR combination license in 2025, practice as much as possible. Free sample tests published on our website will help you check and improve your knowledge and boost your grades. Please bear in mind that DMV requirements for issuing a combination license may vary from state to state.
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1 . What does the tractor protection valve do?
Ensures oil adequately lubricates the engine
The tractor protection valve keeps air in the tractor or truck braking system, should the trailer break away or develop a bad leak.
2 . When you are pulling a trailer, the air supply control lever should be in its ____ position.
Tractor protection controls in older vehicles may be operated by levers instead of knobs. If an air supply control is set in its "normal" position, it is properly set for you to pull a trailer.
3 . When driving a vehicle equipped with an Anti-Lock Braking System (ABS), brakes should be applied:
When driving a vehicle with ABS, you should brake in the same manner as you would in a vehicle without ABS.
4 . Rearward amplification refers to:
Vehicles with trailers are vulnerable to rollover due to the "crack-the-whip" effect, which is caused by rearward amplification.
5 . Keeping cargo centered on a rig can:
A rollover is more likely if cargo is unevenly loaded in a rig. To help prevent a dangerous rollover, it is important to keep a load as centered on the rig as possible.
6 . In a sudden turn, the ____ trailer is the most likely to turn over.
First
When making a turn, be sure to steer gently and smoothly. Making a quick turn while pulling trailers is dangerous and can increase the risk of the last trailer rolling over.
7 . In a vehicle equipped with an automatic tractor protection valve, the valve will pop out when:
Air pressure is above 45 psi.
In vehicles equipped with an automatic tractor protection valve, the valve will pop out if air pressure drops to a level between 20 and 45 psi. When the valve pops out, the protection valve will close, stopping the flow of air.
See the exact questions that will be on the 2025 Oregon DMV exam.
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2025 Oregon | Frequently Asked Questions
A CDL Class B license in Oregon allows a driver to operate single vehicles with a Gross Vehicle Weight Rating (GVWR) of 26,001 or more pounds, or a vehicle towing another not exceeding 10,000 pounds. This includes buses, farm labor vehicles, and any vehicle designed to transport 16 or more passengers (including the driver).
A Class B CDL license in Oregon allows a driver to operate single vehicles with a GVWR of 26,001 or more pounds, or tow a vehicle not heavy than 10,000 pounds. It covers vehicles like city buses, delivery trucks, dump trucks with small trailers, and large straight trucks.
To acquire a Class B CDL license in Oregon, you must be at least 18 years old (21 for interstate driving), have a valid Oregon driver's license, pass a vision test, and pass the General Knowledge exam. You'll also need to pass a skills test which includes pre-trip inspection, basic controls, and on-road driving. A medical examination is also required.
In Oregon, to qualify for a Class B CDL license, you must be at least 21 years old for interstate driving and at least 18 years old for intrastate driving. You must also pass a knowledge test, a skills test, and a medical examination.
Specific endorsements aren't necessary for a Class B CDL license, but they can expand your driving opportunities. Endorsements are additional qualifications for driving certain types of vehicles or transporting specific cargo, like hazardous materials. To get an endorsement, you must pass a specific knowledge test.
The Class B CDL skills assessment in Oregon includes a pre-trip vehicle inspection to ensure the vehicle is safe to drive, a basic vehicle control test to assess your ability to handle the vehicle, and an on-road driving test to evaluate your ability to drive safely in various traffic situations and road conditions.
Yes, Class B CDL license holders are limited to operating vehicles that are under 26,001 pounds or towing vehicles that weigh less than 10,000 pounds. They cannot operate Class A vehicles without the appropriate license. Additionally, they may need specific endorsements to drive buses, tank trucks, or transport hazardous materials.
Yes, it is possible. The Oregon DMV provides the written Class B CDL test in several languages other than English. However, federal regulations require that all CDL holders understand English well enough to converse with the general public, understand highway traffic signs and signals, respond to official inquiries, and make entries on reports and records.
Yes, you can request accommodations for the Class B CDL written exam in Oregon if you have a documented disability. The Oregon DMV provides various accommodations such as sign language interpreters, extra time, and separate testing rooms. You must make your request in advance and provide appropriate documentation to support your need for accommodation.
Yes, if you do not pass the Class B CDL written test in Oregon, you can retake it. However, there's a waiting period of one day before you can try again. The test can be retaken multiple times, but after three failures, you must wait 28 days before the next attempt. Each test attempt requires a separate fee.
