Impedance Relay Objective Type Questions and answers

36.  Impedance relay can be used for

   A. Phase faults only

   B. Earth faults only

   C. Both earth and phase faults

   D. None of the above

37.  Impedance relay may use

   A. Balance beam structure

   B. Induction cup structure

   C. Shaded pole structure

   D. Either A or B

38.  An impedance is relay is a

   A. Voltage restrained over current relay

   B. Voltage restrained directional relay

   C. Directional restrained over current relay

   D. Directional restrained over voltage relay

39.  On transient fault OC and impedance relay

   A. Under reaches

   B. Over reaches

   C. Reach unaffected

   D. None of the above

40.  Threshold characteristics of a plain impedance relay in a complex Z plane is a

   A. Circle passing through origin

   B. Circle with the centre at the origin

   C. Straight line passing through origin

   D. Straight line offset from the origin

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