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%
 -10%
 6.92%
 10%

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Power Systems
Which of the following statements is/are true? The elements of each row of a Y bus matrix for load flow studies in power system add up to zero

 if the shunt admittances at the buses are ignored
 if the mutual couplings between transmission lines are absent
 if both 2 and 3 are satisfied
 always

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Power Systems
An impulse turbine

  operates by initial complete conversion to kinetic energy.
 makes use of a draft tube.
 always operates submerged.
 is most suited for low head and high discharge power plants.

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