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Power Systems

Power Systems
Find the surge impedance of a line when inductance is 160 mH and capacitance is 1µF?

 800 Ω
 400 Ω
 160 Ω
 200 Ω

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Power Systems
To improve the efficiency of thermal power plant ________________ is placed between boiler and turbine.

  economizer.
  air preheater.
  superheater.
  ash handling point.

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Power Systems
How to find the total number of strands (N) when number of layers (x) are given

 Total number of strands N = 3x² + 3x + 1
 Total number of strands N = 3x² - 3x + 1
 Total number of strands N = 3x² + 3x - 1
 Total number of strands N = 3x² - 3x - 1

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Power Systems
A transmission line has a surge impedance of 400 Ω is connected with the cable having surge impedance of 40 Ω, a surge magnitude of 100 kV is travelling from the transmission line towards the cable. Find the reflected voltage?

 -81.82 kV
 -18.18 kV
 18.18 kV
 81.82 kV

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Power Systems
Zero sequence currents can flow from a line into a transformer bank if the windings are in

 delta / delta.
  ground star / delta.
 delta / star.
 star / grounded star.

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Power Systems
Sparse matrix is matrix which contain

 more number of zeros
 more number of memory elements
 more number of non zeros
 less number of memory elements

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