Choose the right answer from the following

Which is not true for three-phase AC?

  1. The three-phase power supply has three distinct wave cycles.
  2. The voltage of three-phase is 230 V.
  3. The efficiency of three-phase is high compared to single-phase.
  4. Three-phase is expensive compared to single-phase.

Answer: All the above are true except (b)

Explanation: The voltage of the single-phase is 230V, whereas three-phase voltage is 415V.

 

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