Combination #1
Combination Vehicles Practice Test | West Virginia 2025 #1 Page 2 of 3
Train for FREE online with our West Virginia 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 WV combination license in 2025, 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.
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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 . The best way to notice if a trailer has begun to skid is to:
Feel the tractor move.
The easiest way to become aware that your trailer has begun to skid is to observe it in your mirrors. Checking your trailer in your mirrors will also allow you to spot any skidding at the earliest possible moment.
10 . How many air lines does a combination vehicle have?
Four
Every combination vehicle has two air lines: the service line and the emergency line.
11 . A shut-off valve:
Should always be open.
Shut-off valves are used in air supply lines to control the passage of air from one trailer to another. The rear shut-off valve should always be closed to prevent air from leaving the braking system.
12 . If a load is placed on one side of a trailer, the trailer:
Have improved steering.
If the weight of a load is placed primarily one side of a trailer, the trailer may lean, increasing the risk of a rollover.
13 . When connecting a converter dolly to a second or third trailer, the trailer height should be:
Next to the center of the fifth wheel.
When connecting a converter dolly to a second or third trailer, the trailer height should be correct. It should be slightly lower than the center of the fifth wheel.
14 . The easiest way to recognize that your trailer has begun to skid is to:
Watch the jackknife warning light on the control panel.
