Free Iowa CDL Double/Triple Trailers Practice Test 2022

Do you know how to pair double or triple trailers? If you are planning to take the CDL double/triple trailer endorsement test, make sure to know it! Our Iowa CDL Practice Test has the same questions as the real exam which is based on the Iowa CDL Manual. It covers most of the subject areas on the Double/Triple Trailers Test such as pulling double and triple trailers, the risk of rollover, managing space, and special considerations when hauling multiple trailers. In addition, each question has a detailed explanation that will help you understand the concept and answer future questions about it correctly. If you don't get the pass right away, you can take this CDL practice test an unlimited number of times to make sure you learn all the questions. Let’s try our Free Iowa CDL Double/Triple Trailers Practice Test today and pass your CDL endorsement exam! Good luck and keep driving safely!

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 Double/Triple Trailers Test format:
20 questions
16 correct answers to pass
80% passing score
List of questions
1.
What is the function of an "application pressure gauge"?
2.
What should you do when the low air pressure warning comes on?
3.
On large buses low pressure warning devices usually signal at ______.
4.
The most efficient way to drive down a long grade is to ________.
5.
How often should alcohol containers be checked during cold weather?
6.
A low pressure warning signal could be __________.
7.
You are visually checking the coupling of a converter dolly to the rear trailer. How much space should be between the upper and lower fifth wheel?
8.
Automatic air tanks _______.
9.
You are driving with double trailers and must use your brakes to avoid a crash. For emergency braking you should:
10.
An air compressor can be cooled by _______.
11.
Why should you check the brake adjustment often?
12.
The tractor protection valve should pop out when air pressure falls to:
13.
If the air compressor has its own oil supply you should do what before driving?
14.
Where is compressed air stored?
15.
When testing the trailer emergency brakes, charge the system, pull out the trailer air supply control, and:
16.
When checking that air is flowing to all trailers,what is used to provide air to the supply lines?
17.
When stab braking if you re-apply the brakes before the wheels start rolling, __________.
18.
What does the air compressor governor control?
19.
To position the converter dolly over short distances you can:
20.
The pintle hook should never be unlocked when: