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Answer :

Impedance relays are used for phase faults on long line.

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

Answer : The single phasing relays are used for the protection of three phase motors.

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

Description : For a 500 Hz frequency excitation, a 50 km long power line will be modeled as

Answer : For a 500 Hz frequency excitation, a 50 km long power line will be modeled as long line

Description : what is mean by long transmission line ?

Answer : The transmission line which have length more than 250 km are known as long transmission lines.