Combination Vehicles Practice Test | Indiana 2024 #1 Page 3 of 3
Train for FREE online with our Indiana CDL combination vehicle test. The official exam test consists of several obligatory parts, with all of them checking your knowledge of different blocks of road rules. If you need to obtain a IN combination license in 2024, practice as much as possible. Free sample tests published on our website will help you check and improve your knowledge and boost your grades. Please bear in mind that DMV requirements for issuing a combination license may vary from state to state.
15 . What is a tractor protection valve?
In a combination vehicle with air brakes, the tractor protection valve keeps air in the tractor or truck brake system in the event of the trailer breaking away or developing a leak.
16 . What happens when the wheels of a trailer lock up?
A trailer tends to swing around, potentially resulting in a trailer jackknife, if its wheels lock up.
17 . What is another name for the service line?
The trailer service air line is also referred to as the control line or signal line.
18 . Which of the following types of vehicles is most prone to the “crack-the-whip" effect?
Double and triple combinations are the most vulnerable to turning over as a result of the "crack-the-whip" effect.
19 . After finishing a pre-trip inspection, you should:
Before a trip, you should ensure that air reaches all air brakes on all trailers by opening up the rear emergency line and service line shut-off valves to listen for escaping air. Close both shut-off valves before beginning to drive.
20 . If you are operating a vehicle built before 1998 and are unsure if the trailer has an Anti-Lock Braking System (ABS), you can:
If you are operating a vehicle built before 1998 and are unsure if the trailer has an Anti-Lock Braking System (ABS), you can check under the trailer for wheel speed sensors coming from the back of the brakes.
See the exact questions that will be on the 2024 Indiana DMV exam.
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