Free Iowa CDL Combination Vehicles Practice Test 2022

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

Our CDL practice tests:
Based on 2022 IA commercial driver's license manual
Full answers + detailed explanations
Perfect for first-time, renewal applicants
IA CDL Combination Vehicles Test format:
20 questions
16 correct answers to pass
80% passing score
List of questions
1.
Air brake equipped trailers made before 1975:
2.
After supplying air to the trailer, how should you check for crossed air lines?
3.
When you open the emergency shut-off valve at the back of the last trailer after supplying air to trailer(s):
4.
The higher the center of gravity of your truck, the:
5.
To unlock the fifth wheel, the locking lever should be placed in the ______ position.
6.
The iron trailer supports are up and the trailer is resting on the tractor. Make sure:
7.
To prevent water and dirt from entering the air system, hose couplers can be attached to dummy couplers or:
8.
If you have to enter another traffic lane to complete a wide turn, you should:
9.
When pulling trailers:
10.
When uncoupling, the tractor should:
11.
If the spring brakes are not released when you pushed the trailer air supply valve you should:
12.
The best and earliest way to recognize that your trailer has started to skid is:
13.
How much space should there be between the upper and lower fifth wheel?
14.
To stop a trailer skid you should:
15.
Driving with an empty trailer:
16.
What will happen if the air lines are crossed when you hook up to an old trailer?
17.
When backing under the trailer, do all of the following except:
18.
When driving a set of doubles, it is necessary to close which shut-off valve in the last trailer:
19.
Triples combinations have a rearward amplification of:
20.
The front trailer supports are up and the trailer is resting on the tractor. Make sure: