Derive an expression for the critical clearing angle for a power system consisting of a single machine supplying to an infinite bus, for a sudden load increment.

2Medium10 marks

How a compensating coil can be utilized in reducing connection errors in an electro-dynamometer type wattmeter?

3Medium20 marks

What is meant by an infinite transmission line? Also, explain the term 'electrical length' of a transmission line. In what units is it measured?

(ii) Determine the electrical length of a 20 m long transmission line operating at 1 MHz, if u = 0.7c on the line. Take c = 3 x 10^8 m/s.

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