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Power Systems

Power Systems
Skin effect depends on

All of these
 frequency
 conductivity
 relative permeability

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Power Systems
The zero sequence current of a generator for line to ground fault is j3 pu. Then the current through the neutral during the fault is

 j1 pu
 j6 pu
 j9 pu
 j3 pu

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Power Systems
Which of the following is not a secondary nuclear fuel

 None of above.
  U235.
 Pu239.
 U233.

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Power Systems
Ferranti effect will not occur in which of the following transmission lines

 short transmission lines
 medium transmission lines
All of these
 long transmission lines

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Power Systems
Lightning arresters are used for

 protection of equipment from external lightning
All of these
 protection of equipment from short circuits
 protection of equipment from open circuits

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Power Systems
The positive, negative and zero sequence impedances of a transmission line are 0.5,0.5 and 1.1 pu respectively. The self (Zs) and mutual (Zm) impedances of the line will be given by

 Zs = 0.5 pu, Zm =0.6 pu
 Zs = 0.7 pu, Zm =0.2 pu
 Zs = 0.6 pu, Zm =0.5 pu
 Zs = 0.2 pu, Zm =0.7 pu

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