Practice question

Which inverter waveform is commonly selected for a traffic-signal UPS when compatible with the approved equipment specification?

  1. Modified sine wave inverter for cost savings
  2. Pure sine wave (true sine wave) inverter for compatibility with signal equipment
  3. Square wave inverter for maximum efficiency
  4. DC-only output (no inverter needed)

Answer: B — Pure sine wave (true sine wave) inverter for compatibility with signal equipment

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