Free Illinois CDL Combination Vehicles Practice Test 2023

You have to pass the Illinois CDL combination vehicles endorsement to get ready for propelling your career with your license. You are looking for a good Illinois 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 Illinois 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 Illinois CDL Combination Vehicles Practice Test today and walk out with your endorsement!

Our CDL practice tests:
Based on 2021 IL commercial driver's license manual
Full answers + detailed explanations
Perfect for first-time, renewal applicants
IL CDL Combination Vehicles Test format:
20 questions
16 correct answers to pass
80% passing score
List of questions
The air lines on a combination vehicle are often colored to prevent them from mixing up. The emergency line is _____, the service line is _________.
The likelihood of a fully loaded rig turning over compared to an empty trailer is:
To unlock the fifth wheel, the locking lever should be placed in the ______ position.
The tractor protection valve will close, and the trailer emergency brakes will come on when there is a major leak in the _____ brake line.
Compared to a straight truck or bus, there are ______ things to inspect in combination vehicles.
There are two things that a driver can do to prevent a rollover. They are: (1) keep the cargo as close to the ground as possible and (2):
To make coupling and uncoupling a loaded trailer easier:
When backing under the trailer, air lines:
A major leak in the trailer emergency line will cause:
When unlocking the fifth wheel in Step 6, all of the following apply except:
A driver crosses the air lines when hooking up to an old trailer. What will happen?
When you notice that your trailer has lost traction and is going into a skid, you should:
When parking trailers without spring brakes, it is very important to:
To test the trailer brakes before driving, use the hand valve or the:
The hand valve should be used:
After connecting the air lines but before backing under the trailer you should:
When coupling, the proper position of the fifth wheel is:
The fifth wheel locking lever is not locked after the jaws close around the kingpin. This means that:
When driving a set of doubles, it is necessary to close which shut-off valve in the last trailer:
In case of landing gear failure while pulling out from under it, you should: