When an induction motor runs at rated load and speed, the iron losses are :(a) negligible (b) very heavy(c) independent of supply frequency (d) independent of supply voltage?
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a) negligible. No load losses/iron losses are the function of voltage. as voltage remains constant during full load as well as no load ,hence iron losses are same.
during full load , the amount of current drawn is high as compared to no load case. as copper losses are dependent on value of current, so copper losses are way higher than iron losses . so Negligible
during full load , the amount of current drawn is high as compared to no load case. as copper losses are dependent on value of current, so copper losses are way higher than iron losses . so Negligible
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