Pilot Wire Protection Protection Objective Type Questions and answers

16.  In a balanced voltage pilot wire protection scheme if the pilot circuit gets opened, the relay will

   A. Fail to trip on internal faults

   B. Trip on full load

   C. Trip instantaneously on external faults

   D. None of the above

17.  In a balanced voltage pilot-wire protection scheme, if the pilot circuit gets short-circuited, the relay will

   A. Fail to trip on internal faults

   B. Fail to trip on external faults

   C. Trip on full load

   D. Trip instantaneously

18.  The frequency of carrier in the carrier current pilot scheme is in the range of

   A. 1 kHz to 10 kHz

   B. 10 kHz to 25 kHz

   C. 25 kHz to 50 kHz

   D. 50 kHz to 500 kHz

19.  The frequency of carrier transmitted by microwave pilot is in the range of

   A. 1000 kHz to 1500 kHz

   B. 2000 kHz to 5000 kHz

   C. 900 kHz to 6000 kHz

   D. 10000 kHz to 15000 kHz

20.  In carrier current protection the purpose of the wave trap is for

   A. Trapping power frequency waves

   B. Trapping high frequency waves entering into generators/ transformer unit

   C. Both a and b

   D. None of the above

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