Differential Relay Objective Type Questions and answers

46.  A differential relay response to

   A. Algebraic difference of two or more similar electrical quantities

   B. Phasor difference of two or more similar electrical quantities

   C. Algebraic difference between two currents

   D. Algebraic difference between two voltages

47.  Differential relays are used for protection of

   A. Feeders

   B. Alternators

   C. Transformers

   D. All of the above

48.  Differential relays are used for protection of equipments against

   A. Internal faults

   B. Over current

   C. Reverse current

   D. Reverse power

49.  In a biased differential relay the bias is defined as a ratio of

   A. Number of turns of restraining and operating coil

   B. Operating coil current and restraining coil current

   C. Fault current and operating coil current

   D. Fault current and restraining coil current

50.  Both voltage and current signals are required for

   A. A plain over current relay

   B. A differential relay

   C. A directional relay

   D. A biased directional relay

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