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Power Systems

Power Systems
For n bus power system size of Y bus matrix is

 (n-1)×(n-1)
 n×n
 (n-1)×(n-2)
 (n-2)×(n-2)

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Power Systems
Which of the following is/are the disadvantages of phase modifiers?

 It requires more maintenance because of running equipment
 It consumes both active and reactive power
 Initial cost of synchronous phase modifier is higher
All of these

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Power Systems
The specific speed of water turbine is the speed at which the turbine develops

 maximum horse power.
 a minimum horse power.
  unit horse power at unit head.
 unit horse power at all heads.

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Power Systems
The water from a catchment is 60*106 cu m annually and hydro station has head of 40 m. Assuming ideal generator and turbine, the power that can be theoretically generated is

 500 kW
 250 kW
 750 kW
 300 kW

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Power Systems
In a thermal power plant, which of its following components needs maximum maintenance attention

 Boiler.
 Condenser.
 Super heater.
 Steam turbine.

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Power Systems
Surge impedance loading of a 3-phase, 400 kV transmission line is 400 Ω. The surge impedance loading is

 400 MW
 800 MW
 200 MW
 1600 MW

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