Free Illinois 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 Illinois CDL Practice Test has the same questions as the real exam which is based on the Illinois 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 Illinois 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 IL commercial driver's license manual
Full answers + detailed explanations
Perfect for first-time, renewal applicants
IL CDL Double/Triple Trailers Test format:
20 questions
16 correct answers to pass
80% passing score
List of questions
The part of the combination vehicle most likely to turn over is the:
What should you do when the low air pressure warning comes on?
To test the tractor protection valve, the engine needs to be:
When testing the coupling of the double trailer, the landing gears of the rear trailer should be:
To check if the converter dolly is securely coupled to the rear trailer you should:
An air brake is made up of which of the following braking systems?
You want to hook your combination to a second trailer that has no spring brakes. To do this without wheel chocks you should:
If the rear trailer does not have spring brakes, disconnecting the emergency line after charging will:
The service brake system ________.
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?
How should the air leakage rate be tested?
When inspecting the shut-off valves on doubles and triples, all of the following is true except:
Pushing the brake pedal down when the spring brakes are on could _________.
During a normal drive, the spring brakes are held back by _____.
An air compressor can be cooled by _______.
Why does a heavily-loaded vehicle take longer to stop than a lightly-loaded vehicle?
What does the air compressor governor control?
You are doing a walk around inspection of a double or triple trailer rig. You should be sure the converter dolly air tank drain valves are _____ and the pintle hook is _________.
Why should you not drive your vehicle if the air pressure does not build up quickly enough?
The pintle hook should never be unlocked when: