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1. Discuss the variation of synchronous reactance (X,) with the rotor field current according to (X,-It) curve. 2. What is the skin effect? Explain

1. Discuss the variation of synchronous reactance (X,) with the rotor field current according to (X,-It) curve. 2. What is the skin effect? Explain the variation of skin factor with the frequency. 3. What is the importance of parameters measurement of synchronous machine? 4. Why is the open circuit characteristics of the synchronous generator non linear? , and why is the short circuit characteristics linear?

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