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Power Systems

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

 Xm - Xs
 Xs - Xm
 2Xs + Xm
 Xs +2 Xm

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Power Systems
If a 500 MVA, 11 kV 3-phase generator at 50 Hz feeds through a transfer impedance of (0+j0.605) Ω/phase, an infinite voltage also at 11 kV, then the maximum steady state power transfer on the base of 500 MVA and 11 kV is

 0.4 pu
 1 pu
 0.8 pu
 0.5 pu

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Power Systems
Nuclear fission means

  breaking up of nuclear of heavy atoms into nearly equal parts.
  moderator.
  combination of two light nuclei.
  graphite.

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Power Systems
A 3 layer and diameter of each strand is d, then find the total diameter of ACSR conductor?

 d
 3d
 5d
 2d

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Power Systems
The sequence components of the fault current are as follows : Ipositive = j1.5 pu, Inegative = − j0.5 pu, Izero = − j pu Which fault is this?

  LL.
  LLLG.
  LLG.
  LG.

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Power Systems
Water hamming process in pen-stocks results in

None of these
  pressure increases.
  noise increases, pressure increases, velocity decreases.
  noise increases.

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