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A 415 V three-phase a.c. motor has a power output of 12.75 kW and operates at a power factor of 0.77 lagging and with

A 415 V three-phase a.c. motor has a power output of 12.75 kW and operates at a power factor of 0.77 lagging and with an efficiency of 85%. If the motor is delta-connected, determine (a) the power input, (b) the line current and (c) the phase current.

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