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Power Systems

Power Systems
Which turbine is ideally suited to pumped storage plants

 Impeller.
 Pelton.
  Kaplan.
 Francis.

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Power Systems
Which of the following is used in thermal plants

All of these
 Otto cycle
 Rankine cycle
 Joule cycle

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Power Systems
Lightning arresters are used to protect electrical equipment against

 direct strokes of lightning.
 power frequency of over voltages.
  over voltages due to indirect lightning stroke.
 over currents due to lightning stroke.

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Power Systems
The positive (Z1), negative (Z2) and zero sequence (Z0) impedances of a transmission line follows the relation

 any of the above
 Z1 = Z2 = Z0
 (Z1 = Z2) > Z0
 (Z1 = Z2) < Z0

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Power Systems
Merze price current scheme protection is used in

  transformer.
  alternator.
  both A and B.
  bus bars.

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Power Systems
Condition for maximum voltage regulation

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

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