Free Oregon CDL Combination Vehicles Practice Test 2022

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 2022 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
1.
You should not back a tractor under a trailer until the air system is:
2.
The air lines on a combination vehicle are often colored to prevent them from mixing up. The emergency line is _____, the service line is _________.
3.
The likelihood of a fully loaded rig turning over compared to an empty trailer is:
4.
The trailer air supply control knob is:
5.
When inspecting the coupling area, all of the following are required except:
6.
When you open the emergency shut-off valve at the back of the last trailer after supplying air to trailer(s):
7.
Rearward amplification is a major cause of:
8.
If the service line comes apart while you are driving a combination vehicle, but the emergency line stays together, what will happen right away?
9.
You are driving a combination vehicle when the trailer breaks away, pulling apart both air lines. You expect the trailer brakes to come on and:
10.
Improperly greased or lubricated fifth wheels will cause:
11.
When you notice that your trailer has lost traction and is going into a skid, you should:
12.
The emergency air line is usually what color?
13.
Some of the points for inspecting the coupling include the following except:
14.
The best and earliest way to recognize that your trailer has started to skid is:
15.
If the spring brakes are not released when you pushed the trailer air supply valve you should:
16.
In normal driving, some drivers use the hand valve before the brake pedal to prevent a jack-knife. Which of the statements is true?
17.
You have a major leak in the service line, and you put on the brakes. Service air will escape and cause the:
18.
What will happen if the air lines are crossed when you hook up to an old trailer?
19.
All of these are part of the final 3 steps of uncoupling the trailer except:
20.
A specific item to check on a sliding fifth wheel is: