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Power Systems

Power Systems
Which of the following represents the transmission line positive sequence reactance

 2Xs + Xm
 Xs +2 Xm
 Xm - Xs
 Xs - Xm

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Power Systems
Where the voltage is high and current to be interrupted is low, Which of following the breaker is preferable?

 Oil CB.
 Any of these.
 Air blast CB.
  Vacuum CB.

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Power Systems
Skin effective is more in case of

 power lines
 communication lines
None of these
 same in both cases

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Power Systems
Which of the following represents the transmission or reflection coefficient of voltage Tv? (Zl = Surge impedance of load, Zs = Surge impedance of line)

 2Zs/(Zs + Zl)
 (Zs - Zl)/(Zs + Zl)
 (Zl - Zs)/(Zs + Zl)
 2Zl/(Zs + Zl)

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Power Systems
Which of the following buses is/are not PV buses?

 both 1 and 2
 voltage control buses
 fixed shunt capacitor buses
 reactive power support buses

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Power Systems
Which of the following is/are the effects of corona

 power loss decreases
 charging current increases
 interference decreases
All of these

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