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Power Systems

Power Systems
For load flow studies, What are the quantities specified at load bus are

 P and V
 P and Q
 V and δ
 δ and Q

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Power Systems
Stock bridge dampers are used to

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

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Power Systems
The per unit impedance of a circuit element is 0.30. If the base kV and base MVA are halved, then the new value of the per unit impedance of the circuit element will be

 0.60
 0.30
 0.0030
 0.0060

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Power Systems
The charging current of a 400 kV line is more than that of a 220 kV line of the same length?

 either 1 or 2
None of these
 False
 True

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Power Systems
Keeping in view the cost and overall effectiveness, the following circuit breaker is best suited for capacitor bank switching?

 SF6 CB.
  Vacuum CB.
 Air blast CB.
 Oil CB.

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Power Systems
The positive sequence reactance will be equal to negative sequence if the equipment is

  none of these.
  transformer and transmission lines.
  generator.
  motor.

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