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Power Systems

Power Systems
A string type insulator has three units with self capacitance C and ground capacitance of 0.2 C having a string efficiency of

 82%
 76%
 80%
 78%

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Power Systems
One fission of U235 releases energy of

 335 MeV.
 525 MeV.
 435 MeV.
  200 MeV.

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Power Systems
A hydro electric generating station is supplied from a reservoir of capacity 5 × 10 − 6 cubic meters at a head of 200 meters. Find the total energy available in KWh if the overall efficiency is 75 %

 3 × 106 kWh.
 4.06 × 106 kWh.
  2.044 × 106 kWh.
 5 × 106 kWh.

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Power Systems
Direct conversion of heat energy into electrical energy is possible through

 Both A and C.
 Thermal converters.
 Fuel or solar cell.
 MHD generator.

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Power Systems
What is the correct expression for the electrical power developed by

  ( 0.763 / 75 ) × WQHη.
 ( 7 / 75 ) × WQHη.
 75 × 0.736 × WQHη.
 ( 75 / 0.736 ) × WQHη.

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Power Systems
Three generators rated 100 MVA, 11 kV have an impedance of 0.15 pu each. If in the same plant, these generators are being replaced by a single equivalent generator, the effective impedance of equivalent generator will be

 0.05 pu
 0.15 pu
 0.45 pu
 0.25 pu

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