Discussion
A single-phase machine is preferred to a three-phase one when
Answer: D
Correct answer: only a single-phase supply is available
That is the whole of the case. Where three phases are available the three-phase machine is better in every respect - more efficient, smaller for its rating, self-starting, smooth in torque and better in power factor. The single-phase machine exists because domestic and many small commercial premises have only one phase.
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