Earth Fault Relay | Earth Fault Relay Objective Type Questions and answers

26.  In an over current protection the setting of the earth fault relay is

   A. More than the phase fault relay

   B. Equal to the phase fault relay

   C. Less than the phase fault relay

   D. The two settings are unrelated to each other

27.  Earth fault relays are

   A. Directional relays

   B. Nondirectional relays

   C. Short update Time relays

   D. None of the above

28.  The earth fault in stator causes

   A. Arcing to core

   B. Severe heating in conductors and thereby damaging the insulation

   C. Open circuit in the stator

   D. Both A and B

29.  Earth fault protection for an electric motor is provided by means of

   A. Instantaneous over-current relay

   B. Instantaneous relay having a setting of approximately 30% of motor rated current in the residual circuits of two CTs

   C. Ground wire

   D. Both B and C

30.  The magnitude of earth fault current for a given fault position within a winding depends upon

   A. The winding connections

   B. The method of neutral grounding

   C. Unmatched characteristics of CTs

   D. Both A and B

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