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Power Systems

Power Systems
Condition for maximum voltage regulation

 cosφ = R/X
 tanφ = X/R
 tanφ = R/X
 cosφ = X/R

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Power Systems
If we increase the length of the transmission line, the charging current

 decreases
None of these
 increases
 remains unaffected

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Power Systems
A 4 bus power system consists of 4 transmission lines, then find the sparsity of Y bus matrix?

 0.4
 0.5
 0.25
 0.75

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Power Systems
Recovery voltage in CB is equal to

  transient voltage.
  none of these.
  normal frequency 50 Hz rms voltage.
  arcing period voltage.

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

 Solar.
  Wind.
 Tidal.
 Geothermal.

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Power Systems
Rankine cycle efficiency of a steam power plant is of

  30 - 45 %.
  20 - 30 %.
  45 - 80 %.
  60 - 80 %.

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