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Q#1 Transmission and Distribution GATE EE 2001 MCQ +1 mark -0.33 marks

A 50 Hz balanced three-phase, Y-connected supply is connected to a balanced three phase Y-connected load.  If the instantaneous phase-α of the supply voltage is and the phase-α of the load current is , the instantaneous three-phase power is

A constant with a magnitude of

A constant with a magnitude of

Time-varying with an average value of  and a frequency of 100Hz

Time-varying with an average value of  and a frequency of 50 Hz

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