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Power Systems

Power Systems
A 4 bus power system consists of 4 transmission lines, then find the sparsity of Y bus matrix?

 0.4
 0.75
 0.25
 0.5

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Power Systems
The presence of earth in case of overhead lines

 decrease inducatance
 increase capacitance
 decrease capacitance
 increase inductance

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Power Systems
A 100 Km long transmission line is loaded at 110 kV. If the loss of line is 5 MW and the load is 150 VA the resistance of the line is

 4.65 Ω / phase.
 2.26 Ω / phase.
  8.06 Ω / phase.
 6.06 Ω / phase.

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Power Systems
A 25 MVA, 11 kV alternator is supplying full load at a point of 0.75 lagging. Determine the percentage increase in earning capacity when it is operated at improved power factor of 0.96 lagging.

  14 %.
  None of above
  56 %.
  28 %.

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Power Systems
The insulation resistance of the 20 km long underground cable is 8 MΩ. Other things being same, the insulation resistance of 10 km long cable will be

 16 MΩ
 32 MΩ
 4 MΩ
 8 MΩ

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Power Systems
The receiving end voltage for a long line under no load condition is

 equal to the sending end voltage
 more than the sending end voltage
 any of the above
 less than the sending end voltage

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