Question: A three - phase, 6 0 - Hz induction motor runs at 7 1 5 r / min at no load and at 6 7

A three-phase, 60-Hz induction motor runs at 715 r/min at no load and at 670 r/m at full load. (a) How many poles does this motor have? (b) What is the slip at rated load? (c) What is the speed at one-quarter of the rated load? (d) What is the rotor's electrical frequency at one-quarter of the rated load?

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