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Power Systems

Power Systems
Breaking current is a ------------------ value?

 RMS
 average
 any of the above
 maximum

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Power Systems
A three phase, 33 kV oil circuit breaker is rated 1200 A, 2000 MVA, 3 secs. The symmetrical breaking current is

 45 kA.
 55 kA.
 50 kA.
  35 kA.

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

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Power Systems
The insulation of the modern EHV lines is designed based on

 the lighting voltage.
  the switch voltage.
 R × I.
 corona.

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Power Systems
If the frequency is increased, then skin effect will

 any of the above
 increases
 remains unaffected
 decreases

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Power Systems
A string type insulator has three units with self capacitance C and ground capacitance of 0.2 C having a string efficiency of

 78%
 76%
 80%
 82%

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