Relay | Protective Relay Objective Type Questions and answers

26.  ........ Relays is preferred for phase fault on short transmission line

   A. Induction type

   B. Reactance

   C. Impedance

   D. None of the above

27.  The under voltage relay can be used for

   A. Generators

   B. Bus bars

   C. Transformers

   D. All of the above

28.  The relay with inverse time characteristic will operate within

   A. 1.5 sec

   B. 5 to 10 sec

   C. 5 to 20 sec

   D. 20 to 30 sec

29.  The single phasing relays are used for the protection of

   A. Single phase motors only

   B. Two phase motors only

   C. Two single phase motor running in parallel

   D. Three phase motors

30.  The inverse definite mean time relays are used for over current and earth fault protection of transformer against

   A. Heavy loads

   B. Internal short circuits

   C. External short circuits

   D. All of the above

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