Free Iowa CDL Double/Triple Trailers Practice Test 2023

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 2021 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
What is the purpose of an antilock braking system (ABS)?
What is proper braking technique for drivers travelling down a hill or any other downgrade?
When coupling, correct trailer height should:
When driving a truck with more than one trailer, which trailer should be first behind the truck?
When testing the coupling of the double trailer, the landing gears of the rear trailer should be:
Automatic adjusters should ________.
After coupling, the air shut-off valves at the back of the first trailer should be:
An air brake is made up of which of the following braking systems?
A front brake limiting valve ______.
Pushing the brake pedal down when the spring brakes are on could _________.
If you want to couple a second trailer to your combination vehicle, secure it by using:
If your vehicle is not equipped with ABS, when you brake hard on a slippery surface what may occur?
Vehicles without automatic air tank drains need to be checked manually to remove ________?
When driving doubles or triples, for safer handling which trailer should be at the rear?
Typically, air storage tanks hold enough air to allow the brakes to be used _______ even if the compressor stops working.
Why do some air brake systems have an alcohol evaporator?
Why should you never push the brake pedal down when the spring brakes are on?
When the mechanical arm of a wig wag drops into your view that means the pressure in your system has dropped below what psi?
Drivers of doubles and triples must take into greater account:
A converter dolly is used: