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.
Which of the following is part of the electrical and air lines coupling inspection?
2.
After the trailer has been coupled to the tractor, the tractor protection control valve should be placed in what position?
3.
The air leakage rate for a combination vehicle (engine off, brakes on) should not be more than _____ psi per minute.
4.
Supplied by the service line from the tractor, each trailer or dolly has its own:
5.
When uncoupling, make sure that the parking area:
6.
When you get ready to back under a semitrailer you should line up:
7.
To help prevent rollover, keep the center of gravity of the load as low as possible, and:
8.
Your emergency air line breaks or gets pulled apart while you are driving. The loss of pressure will cause the:
9.
To stop other drivers from passing you on the right when turning wide:
10.
The emergency air line controls the emergency brakes on combination vehicles, and:
11.
The tractor should be positioned to back under the trailer:
12.
A driver crosses the air lines when hooking up to an old trailer. What will happen?
13.
Trailers will have an ABS malfunction lamp:
14.
If the wheels of the trailer lock up and the trailer swings around, it could cause a:
15.
When parking trailers without spring brakes, it is very important to:
16.
Trailer landing gear:
17.
A fifth wheel in proper position for coupling will have:
18.
Why should you be sure that the fifth wheel plate is greased as required?
19.
You supply air to the trailer tanks by:
20.
To test the tractor protection valve, pump the brakes with the engine off until the trailer air supply knob pops out, usually at: