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Q#1 Electro-mechanical Instruments GATE EE 2003 MCQ +2 marks -0.66 marks

A wattmeter reads 400 W when its current coil is connected in the R phase and its pressure coil is  connected between this phase and the neutral of asymmetrical 3-phase system supplying a balanced star connected 0.8p.f. inductive load. The phase sequence is RYB. What will be the reading of this wattmeter if its pressure coil alone is reconnected between the B and Y phases all other connections remaining as before

400.0

519.6

300.0

692.8

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