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Power Systems

Power Systems
The rating of CB is in terms of

  current.
  volt - ampere.
  VAR.
  voltage.

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Power Systems
Two insulator discs of identical capacitance value C make up a string for a 22 kV, 50 Hz, single phase overhead line insulation system. If pin to earth capacitance is also C, then find the string efficiency?

 86%%
 90%
 50%
 75%

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Power Systems
Which of the following decides the insulation level of 400 kV, EHV line?

 radio interference
 lighting voltage
 skin effect
 switching over voltage

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Power Systems
Which of the following power planets is the least reliable

 Geothermal.
  Wind.
 Solar.
 Tidal.

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Power Systems
Corona is accompanied by

 hissing sound
 power loss and interference
 violet visible light
All of these

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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?

 5.353 pu
 5 pu
 3.535 pu
 7 pu

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