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Calculate the 3-∅ power developed in the IM connected in star using the following data: Vp=7 V, IL=7 A, cosΦ=.6.

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Calculate the 3-∅ power developed in the IM connected in star using the following data: Vp=7 V, IL=7 A, cosΦ=.6.

(a) 88.5 W

(b) 88.4 W

(c) 88.8 W

(d) 88.2 W

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Correct choice is (d) 88.2 W

Easy explanation: The power developed in the IM is √3VLILcos∅. The power is independent of time and frequency. In star connection VL=√3Vp=12.12 V. P=√3VLILcos∅=3×20×5×.8=88.2 W.

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