Power Systems
For variable heads of near about but less than 30 meters, which type of turbine is used in hydro power station?

None of these
 Francis
 Pelton
 Kaplan

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Power Systems
Which of the following is/are the advantages of synchronous phase modifier over the shunt compensation?

 single unit can be used as both capacitance and inductor by adjusting the excitation
 smooth voltage regulation is possible by controlling excitation
 both 1 and 2
 initial cost is low

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Power Systems
In a biased differential relay the bias is defined as the ratio of

  fault current and operating coil current.
  operating coil current and restraining coil current.
  number of turns of restraining and operating coil.
  fault current and restraining coil current.

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