Explain how arc is initiated and sustained in a circuit breaker when the circuit breaker contact separates. Also, derive an expression for the restriking voltage in terms of system voltage, inductance and capacitance, across the circuit breaker contactors. (Assume that the neutral of the system is solidly grounded)

2Medium10 marks

Using the superposition theorem find the voltage 'V' across the 5 ohm resistance in the circuit as shown in Figure 6(c).

3Medium10 marks

A single phase AC bridge rectifier as shown in Figure 2(c) is operating at firing delay angle alpha = 45°. The thyristor T3 gets damaged and behaves as an open circuit. Calculate the value of load resistance R if load current is 3.1556 A.

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