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Power Systems

Power Systems
Buchholz relay is used for protection of

  none of these.
  transformer.
  bus bar.
  alternator.

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Power Systems
Mho relay is used for the protection of

 medium length lines.
  long transmission lines.
 short length lines.
 no length criterion.

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Power Systems
For harnessing low variable water heads, the suitable hydraulic turbine with high percentage of reaction and runner adjust vanes is

  Francis.
  Impeller.
  Pelton.
  Kaplan.

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Power Systems
Which of the following is/are the disadvantages of phase modifiers?

All of these
 It consumes both active and reactive power
 Initial cost of synchronous phase modifier is higher
 It requires more maintenance because of running equipment

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Power Systems
In a 4*4 Y bus matrix the number of non zero elements are 12. Find the sparsity of the system?

 0.5
 0.75
 0.25
 1

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Power Systems
For load flow studies, What are the quantities specified at load bus are

 P and Q
 δ and Q
 V and δ
 P and V

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