ASVAB Science and Tech Practice Questions

Category - Technology/Engineering

Message signs and arrow boards are used to direct traffic and safeguard workers on roads and highways. These devices were originally run by dieselpowered generators.Which of the following provides a practical way to power these mobile devices and is more efficient than a generator?
  1. natural gas
  2. water power
  3. a geothermal system
  4. a solar conversion system
Explanation
Answer: D - a solar conversion system
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