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Power Systems

Power Systems
Operating time of pumped storage plant is

 low
 high
 can't say
 very high

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Power Systems
An over current relay, having a current setting of 125% connected to a supply circuit through a current transformer of ratio 400/5. The pick up value is

 15 A
 6.25 A
 10 A
 12.5 A

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Power Systems
Buchholz relay is used for protection of

  bus bar.
  transformer.
  alternator.
  none of these.

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Power Systems
The commercial sources of energy are

 wood, animal wastes and agricultural wastes.
  fossile fuels and radioactive substances.
 none of above.
 solar, wind, biomass.

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Power Systems
Which of the following is an impulse turbine

  Francis turbine.
  Pelton turbine.
  None of above.
  Kaplan turbine.

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Power Systems
The voltage and current instantaneous values are given as 5 sin (ωt + 30°) pu and 2 sin (ωt - 15°) pu respectively. Find the per unit active power?

 3.535 pu
 7 pu
 5.353 pu
 5 pu

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