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A single-phase supply is described as such because it provides

  • A.a steady direct voltage between two conductors of the supply
  • B.two alternating voltages in exact opposition to one another
  • C.one alternating voltage between two conductors
  • D.three alternating voltages displaced by a hundred and twenty degrees each

Answer: C

Correct answer: one alternating voltage between two conductors

A single-phase supply provides one alternating voltage, between a live conductor and neutral or between two lives. That single voltage is the whole difficulty: it produces a pulsating rather than a revolving field, so every single-phase motor needs some arrangement to start itself.

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