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.
A tractor with a _______ trailer, requires the most amount of stopping distance.
2.
One good way to prevent rollover is:
3.
When inspecting the coupling area, all of the following are required except:
4.
For proper hose coupling, lines are often color-coded. Service lines are usually:
5.
The shut-off valves at the back of the last trailer should be:
6.
If your trailer goes into a skid, you should do all of the following except:
7.
Tractor with a ______ trailer requires the shortest amount of stopping distance.
8.
Off-tracking or cheating causes which of these to follow the wider path while making a turn?
9.
You have pushed the trailer air supply valve. You should not back a tractor under a trailer until the whole air system is:
10.
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:
11.
Which of these statements is true?
12.
To help release the fifth wheel locking lever:
13.
When checking the trailer emergency brakes, the tractor protection control valve should be placed in what position?
14.
In normal driving, some drivers use the hand valve before the brake pedal to prevent a jack-knife. Which of the statements is true?
15.
You have a major leak in the service line, and you put on the brakes. Service air will escape and cause the:
16.
Your emergency air line breaks or gets pulled apart while you are driving. The loss of pressure will cause the:
17.
Air and electrical lines from the tractor to the trailer should be:
18.
At the back of trailer used to tow other trailers are shut-off valves, also called:
19.
When coupling, the proper position of the fifth wheel is:
20.
In case of landing gear failure while pulling out from under it, you should: