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28 March, 19:25

A three-phase 12 HP motor is 90% efficient with a. 89 lagging power factor. What is the required rated input apparent power for this motor running under full load?

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  1. 28 March, 19:50
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    The required rated input apparent power is 14.98 HP

    Explanation:

    Real power input = real power output : efficiency

    real power output = 12 HP

    efficiency = 90% = 0.9

    Real power input = 12 : 0.9 = 13.33 HP

    Apparent power input = real power input : power factor = 13.33 : 0.89 = 14.98 HP
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