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Power Systems

Power Systems
A 4 bus power system consists of 4 transmission lines, then find the sparsity of Y bus matrix?

 0.25
 0.5
 0.4
 0.75

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Power Systems
When a neutral point of 3 - Φ system is directly connected to earth then it has what type of grounding?

  Reactance.
  Peterson coil.
  Resistance.
  Solid.

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Power Systems
String chart is drawn between

 both 1 and 2
 T on Y-axis and S and T on on X-axis
 temperature (T) on X- axis, sag(S) and tension (T) on Y-axis
 nether 1 nor 2

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Power Systems
The positive, negative and zero sequence per unit impedance of two generators connected in parallel are X1 = 0.12 pu, X2 = 0.096 pu and X0 = 0.036 pu. For LG fault at generator terminals (with 1 pu voltage) the positive sequence current will be

 8.936 pu
 10.936 pu
 7.936 pu
 9.936 pu

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Power Systems
How much KWh energy is produced by fission of 1 gm of uranium U235

  24 kWh.
 240 kWh.
  24000 kWh.
 2400 kWh.

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Power Systems
Recovery voltage in CB is equal to

  arcing period voltage.
  none of these.
  transient voltage.
  normal frequency 50 Hz rms voltage.

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