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Q#1 Synchronous Machines GATE EE 1991 MSQ +2 marks -0 marks

A 10 kVA, 380V, 4-pole, 50 Hz, star-connected cyclindrical rotor alternator has a stator resistance and synchronous reactance of 1 ohm and 15 ohms respectively. It supplies a load of 8 kW at rated voltage and 0.8 power factor lagging.

Draw a phasor diagram of operation

Express the resistance and synchronous reactance in per unit values with the machine rating as the base

Calculate the percentage regulation

What is the terminal voltage if the load is suddenly removed (with the speed and excitation unaltered)?

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