🔗Alaska Combination Vehicles — Question 2 of 10
What is the purpose of the trailer air supply control?
Answer: A
To control the tractor protection valve
The trailer air supply control controls the tractor protection valve while supplying the trailer with air pressure.
Source: Alaska CDL Manual
All choices
- ATo control the tractor protection valve
- BTo control air compressor governor cut-in and cut-out
- CThe control brake relay valves for the tractor brakes
Alaska CDL Combination Vehicles Test Info
Questions on Exam
20
Passing Score
80%
Time Limit
Typically 30 minutes; varies by testing location
Age Requirements
Intrastate: 18+ · Interstate: 21+
Alaska Division of Motor Vehicles
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More CDL Combination Vehicles Practice Questions
- Glad hands are usually connecting which of these?
- Why should you lock the tractor glad hands to each other (or dummy couplers) when you are not towing a trailer?
- After connecting the air lines but before backing under the trailer you should:
- The crack-the-whip effect is related to:
- Sudden turns or aggressive braking will have the greatest effect on which trailer?