Switchgear And Protection | Switchgear And Protection Objective Type Questions and answers

36.  Short-circuit currents are due to

   A. Single phase to ground faults

   B. Phase to phase faults

   C. Three phase faults

   D. Any of these

37.  For which of the following protection from negative sequence current is provided?

   A. Generators

   B. Motors

   C. Transmission line

   D. Transformers

38.  For which of the following ratings of the transformer differential protection is recommended?

   A. Above 30 KVA

   B. Equal to and above 5 MVA

   C. Equal two and above 25 MVA

   D. None of the above

39.  Over voltage protection is recommended for

   A. Hydro electric generators

   B. Steam turbine generators

   C. Gasturbine generators

   D. All of the above

40.  Overfluxing protection is recommended for

   A. Distribution transformer

   B. Generator transformer of the power plant

   C. Auto transformer of the power plant

   D. Station transformer of the power plant

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