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


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D. Any of these

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


   A. Generators

   B. Motors

   C. Transmission line

   D. Transformers


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A. Generators

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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


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B. Equal to and above 5 MVA

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39.  Over voltage protection is recommended for


   A. Hydro electric generators

   B. Steam turbine generators

   C. Gasturbine generators

   D. All of the above


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D. All of the above

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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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B. Generator transformer of the power plant

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