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Answer :

Relays can be designed to respond to changes in resistance, reactance or impedance voltage and current, light intensity, temperature.

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Description : IDMT relays are used to protect the transformer against :  (A) Internal short -circuits (B) Open circuits (C) External short circuits (D) Oil leakage

Answer : IDMT relays are used to protect the transformer against : External short circuits

Answer : The inverse definite mean time relays are used for over current and earth fault protection of transformer against internal short-circuits.

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