FREE Double Triple Test Online | Mississippi 2024 Page 2 of 3
Train for FREE with our Mississippi CDL double triple practice test online. 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 MS CDL double triple license in 2021, 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 may vary from state to state.
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8 . What is another name for the service line?
The parallel line
The trailer service air line may also be referred to as the control line or signal line.
9 . When uncoupling a dolly, you should:
Remove the dolly as quickly as possible.
Never unlock the pintle hook with the dolly still under the rear trailer. This could cause the dolly tow bar to fly up, possibly causing serious injury.
10 . What is another name for the service line?
The power line
The trailer service air line is also referred to as the control line or signal line.
11 . A steering wheel should be held:
At the base of the wheel.
A steering wheel should be held firmly with both hands, positioned on opposite sides of the wheel.
12 . An emergency brake must be controlled by:
All trucks, truck tractors, and buses must be equipped with emergency brakes and parking brakes. Because air pressure can eventually leak away, emergency and parking brakes should be held on by mechanical force.
13 . Which type of brakes do most heavy-duty vehicles have?
Gravity brakes
For safety, most heavy-duty vehicles are equipped with dual air brake systems.
14 . When passing another vehicle, you should:
Wait for the other driver to signal that it is safe to do so.
