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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?

 1
 0.5
 0.25
 0.75

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Power Systems
To prevent maloperation of deferentially connected relay while energizing a transformer, the relay restraining coil is biased with

  5th harmonic current.
 3rd harmonic current.
 7th harmonic current.
 2nd harmonic current.

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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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Power Systems
The per unit impedance Z(pu) is given by

 ZΩ* (kVA)b/(KV)²b
 ZΩ* (MVA)b/((KV)²b *100)
 ZΩ* (MVA)b*100/(KV)²b
 ZΩ* (MVA)b/(KV)²b

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Power Systems
Which of the following statements is/are true regarding HVDC?

All of these
 HVDC can utilize earth for its return path
 Corona loss is very much reduced in the dc line
 There is no skin effect in dc line

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Power Systems
Main bus bar protection scheme is /are

  fault bus protection.
  none of these.
  both fault bus and differential protection.
  differential protection.

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