Which of the following relays is used on long transmission lines? A) Impedance relay B) Mho’s relay C) Reactance relay D) None of the above Related MCQs: The inverse definite mean time relays are used for overcurrent and earth fault protection of the transformer against The branch of science which deals with the nature of sound and its transmission is called? In which transmission mode is the communication two-way with the channel being used by both connected devices simultaneously? Electric lines of force?