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.
Before you back under a trailer, make sure that:
2.
How much space should be allowed between the upper and lower fifth wheel after coupling?
3.
Hose couplers are also referred to as:
4.
A function of the tractor protection valve is:
5.
The tractor protection valve will close, and the trailer emergency brakes will come on when there is a major leak in the _____ brake line.
6.
You have coupled with a semitrailer, where should you put the iron trailer supports before driving away?
7.
Over 50% of truck driver accident deaths are caused by:
8.
When backing under the trailer, air lines:
9.
If the service line comes apart while you are driving a combination vehicle, but the emergency line stays together, what will happen right away?
10.
The locking jaws should be around:
11.
When you notice that your trailer has lost traction and is going into a skid, you should:
12.
Some of the points for inspecting the coupling include the following except:
13.
When coupling or uncoupling, all of these apply to the trailer except:
14.
There are two things that a driver can do to prevent a rollover: They are: (1) go slow around turns, and (2):
15.
Crack-the-whip effect occurs when:
16.
To test the trailer brakes before driving, use the hand valve or the:
17.
Like tractor air tanks, trailer air tanks should be kept free of dirt and oil by:
18.
After connecting the air lines but before backing under the trailer you should:
19.
While driving, you should use the trailer hand valve when?
20.
You are coupling a tractor to the semitrailer; you have connected the airlines. Before backing under the trailer, you should: