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Power Systems

Power Systems
In a 4 bus,4×4 Y bus matrix the number of non zero elements are 12. Find the number of transmission lines?

 5
 4
 8
 2

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Power Systems
A sort line with R/X ratio 1, the zero regulation is obtained when the power factor of the load is

 0 leading
 unity
 0.5
 0.707 leading

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Power Systems
A 1-phase transmission line has an impedance (4 + 3j ) Ω. Find the power factor of the load for zero voltage regulation?

 0.6 lead
 0.6 lag
 0.8 lead
 0.8 lag

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Power Systems
If we increase the spacing between the phase conductors, the line capacitance

None of these
 increases
 remains unaffected
 decreases

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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

 76%
 82%
 80%
 78%

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

  ash handling point.
  superheater.
  air preheater.
  economizer.

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