Keeping in view the cost and overall effectiveness, the

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Keeping in view the cost and overall effectiveness, the following circuit breaker is best suited for capacitor bank switching

1. vacuum
2. air blast
3. SF₆
4. oil

Correct Option: A

Biased differential relay has 2 coils. Operating coil and restraining coil. Ratio of differential current (operating coil current) to restraining coil current is known as bias.