Overcurrent Relay Objective Type Questions and answers

31.  In a static over current relay, inverse time characteristics are obtained by

   A. A transistor amplifier

   B. An integrating circuit

   C. A transistor switch

   D. A differentiating circuit

32.  In the case of transmission line protection, over current relay is used

   A. Only up to 110 KV

   B. Only up to 220 KV

   C. Only up to 50 KV

   D. Only up to 1100 KV

33.  Directional over current relays have two exciting coils connected across

   A. CT secondaries of two different phases

   B. VT secondaries of two different phases

   C. CT and VT secondaries of same phases

   D. CT and VT secondaries of two different phases

34.  The domains of power system where directional over current relay is indispensable are

   A. In case of parallel feeder protection

   B. In case of ring main feeder protection

   C. Both A and B

   D. None of the above

35.  In an inverse definite minimum time, electromagnetic type over current relay, the minimum time feature is achieved because of

   A. Saturation of the magnetic circuit

   B. Proper mechanical design

   C. Appropriate time delay element

   D. Electromagnetic damping

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