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Power Systems

Power Systems
If skin depth is more, then skin effect is

 either 1 or 2
 more
None of these
 less

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Power Systems
Which of the following effects are associated with transmission line

 ferranti effect
All of these
 skin effect
 corona effect

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Power Systems
A power system network has n nodes, Z33 of its bus impedance matrix is j0.5 pu. The voltage at node 3 is 1.3∠ -10°. If capacitor is having reactance of -j3.5 pu is now added to the network between node 3 and reference node, the current drawn by the capacitor in pu is

 0.725∠ 80°
 0.433∠ 80°
 0.371∠ -100°
 0.325∠ -100°

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Power Systems
Which of the following decides the insulation level of 400 kV, EHV line?

 skin effect
 lighting voltage
 switching over voltage
 radio interference

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Power Systems
Lightning arresters are used to protect electrical equipment against

  over voltages due to indirect lightning stroke.
 over currents due to lightning stroke.
 power frequency of over voltages.
 direct strokes of lightning.

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Power Systems
For n bus power system size of Y bus matrix is

 n×n
 (n-1)×(n-1)
 (n-2)×(n-2)
 (n-1)×(n-2)

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