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Q#1 Synchronous Machines GATE EE 2015 NAT +2 marks -0 marks

A three-phase, 11 kV, 50 Hz, 2pole, star connected, and cylindrical rotor synchronous motor is connected to an 11kV, 50 Hz source. Its synchronous reactance is  per phase, and its stator resistance is negligible. The motor has a constant field excitation. At a particular load torque, its stator current is 100A at unity power factor. If the load torque is increased so that the stator current is 120 A, then the load angle (in degrees) at this load is __________.

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