Q
Using the trailer hand valve while driving:
Combination Vehiclesmedium
AIncreases brake power
BCan cause a skid
CIs recommended for downhill driving
Detailed Explanation
The correct answer is "Can cause a skid". This is based on federal CDL regulations and safety standards.
Correct Answer: Can cause a skid
Ready to practice for real?
Take our free, full-length Combination Vehicles practice test. Simulates the actual DMV exam with timed questions.
Start Practice TestRelated Questions
After finishing a pre-trip inspection, you should:
combination-vehiclesmedium
93. The trailer air supply control (also known as the tractor protection valve control) should automatically close when the air pressure falls to between:
combination-vehiclesmedium
5. How should you test the tractor semi trailer connection for security?
combination-vehiclesmedium
Trailers with low underneath clearance may be difficult to drive:
combination-vehiclesmedium
To help prevent rollovers, you should:
combination-vehiclesmedium