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.
To prevent moisture from entering the electrical cable when disconnected:
2.
While driving behind another vehicle, under good conditions, you should allow at least one second between your vehicle and the vehicle ahead for each ____ feet of your vehicle length.
3.
The trailer service brakes should be tested with the hand control, and controlled during normal operation by:
4.
After you lock the kingpin into the fifth wheel, you should check the connection by:
5.
To make coupling and uncoupling a loaded trailer easier:
6.
Which part of the kingpin should the locking jaw close around?
7.
In order to allow the trailer brakes to be applied more quickly, what is connected to the service air line?
8.
Before coupling or uncoupling, the trailer wheels should always be:
9.
There are two things that a driver can do to prevent a rollover. They are: (1) go slow around turns, and (2):
10.
A major leak in the trailer emergency line will cause:
11.
What is the term for a commercial vehicle habit of swinging wide on turns?
12.
When should you use the hand valve to park a combination vehicle?
13.
The trailer hand valve should be used:
14.
Improperly greased or lubricated fifth wheels will cause:
15.
You are coupling a tractor to a semitrailer and have backed up, but are not under it. What should you hook up before backing under?
16.
You are about to back your tractor under a semitrailer. The trailer is at the right height when the:
17.
When backing a tractor under a trailer you should:
18.
The safety latch for the fifth wheel locking lever must be _____ for a coupling to be complete.
19.
If you cannot complete your turn without entering another traffic lane you should:
20.
Why should you lock the tractor glad hands to each other (or dummy couplers) when you are not towing a trailer?