Three Phase Induction Motors
The no load speed of an induction motor depends on

The number of its poles
Both supply frequency and number of poles
The maximum flux/poles
The supply frequency

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Three Phase Induction Motors
As load on an induction motor goes on increasing

Its power factor goes on increasing up to full load and then it falls again
Its power factor goes on decreasing
Its power factor goes on increasing even after full load
Its power factor remains constant

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