🔗Arizona Combination Vehicles — Question 4 of 10
Which task is NOT performed during the tractor protection valve test?
Answer: C
Accelerating to 5 mph and then applying the brakes
Once the air brake pressure is up to operating pressure, turn off the ignition. Pump the service brake to vent air to the atmosphere, the tractor protection valve should activate when pressure reaches 20 to 45 psi.
Source: Arizona CDL Manual
All choices
- ATurning off the ignition.
- BVenting air to the atmosphere by applying and releasing the brake pedal.
- CAccelerating to 5 mph and then applying the brakes
Arizona 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+
Arizona MVD
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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?