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Q#1 Electro-mechanical Instruments GATE EE 1995 MSQ +2 marks -0 marks

A symmetrical star connected three-phase load is made of three identical coils having an internal resistance of 12 Ohm and inductance of 142mH. The power taken by this load when connected to a balanced three-phase three-wire supply of 400V, 50Hz is measured using the two wattmeter method. The watt meters used are similar and are of type of 400V, 5A, UPF, class 1 accuracy.

Total Power or Wattmeter Reading = 600 W

Total Power or Wattmeter Reading = 900 W

Maximum Possible Percentage Error total Power = 4.44%

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