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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
A transmission line has surge impedance of 400 Ω, operating at Vs = Vr = 400 kV line is compensated with a shunt capacitance of 30%. The line is connected to a generator delivering 200 MW. Find the load angle with out and with compensation respectively?

 45° and 26°
 26° and 30°
 30° and 45°
 30° and 26°

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Power Systems
In case of failure of prime mover of the generator, which type of relay is used?

 reverse power relay
 distance relays
 offset mho relay
 impedance relay

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Power Systems
If the diameter of the conductor is increased

 the inductance is decreased
 no change in inductance and resistance
 the inductance is increased
 the resistance is increased

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Power Systems
A transmission line has an impedance of (2+j6) Ω has voltage regulation of 10% at a load power factor of 0.8 lag. Find the voltage regulation for a load of 0.6 lead

 6.92%
 -6.92%
 10%
 -10%

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Power Systems
A 25 MVA, 11 kV alternator is supplying full load at a point of 0.75 lagging. Determine the percentage increase in earning capacity when it is operated at improved power factor of 0.96 lagging.

  28 %.
  None of above
  56 %.
  14 %.

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