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Power Systems

Power Systems
In a 4*4 Y bus matrix the number of non zero elements are 12. Find the sparsity of the system?

 0.5
 1
 0.75
 0.25

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Power Systems
Critical disruptive voltage is a voltage at which

 corona is visible with blue or violet colour
 corona is just initiated
 nether 1 nor 2
 both 1 and 2

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Power Systems
The sequence components of the fault current are as follows : Ipositive = j1.5 pu, Inegative = − j0.5 pu, Izero = − j pu Which fault is this?

  LG.
  LLLG.
  LLG.
  LL.

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Power Systems
Stock bridge dampers are used to

 reduce the tension
 reduce the vibrations at the point of support
 increase the sag
All of these

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Power Systems
Earth fault relay uses the which of the following sequence currents?

 any of the above
 positive sequence
 zero sequence
 negative sequence

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Power Systems
The function of draft tube is reaction turbine is to

 increase flow rate of water.
  convert kinetic energy of water.
 all of above.
 reduce water hammer.

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