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Power Systems

Power Systems
Buchholz relay is used for protection of

  alternator.
  none of these.
  bus bar.
  transformer.

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Power Systems
Mechanical energy is supplied to a DC generator at the rate of 4200 J / S. The generator delivers 32.2 Amp at 120 V. How much energy is cost per minute of operation

 25060 J.
  20060 J.
  20160 J.
 23060 J.

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Power Systems
The ratio of reset to pick up current for an induction cup relay is approximately

  0.99.
 0.75.
 1.35.
 1.0.

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Power Systems
Find the relation between sub transient (X"), transient (X') and synchronous reactance (X) ?

 X" > X' < X
 X" > X' >X
 X" < X' < X
 X" < X' > X

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Power Systems
The function of a surge tank is to

 none of above.
  relieve water hammer pressure in the penstock.
 supply water at constant pressure.
 produce surge in the pipeline.

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Power Systems
For variable heads of near about but less than 30 m, which type of turbines is used hydro power plant

  Kaplan.
 None of above.
 Francis.
 Pelton.

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