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Power Systems

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

 less
None of these
 either 1 or 2
 more

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Power Systems
An ACSR conductor has internal inductance 0.05 mH/Km for µr = 1. If this ACSR is replaced with another having µr = 2, then find the internal inductance?

 0.025 mH/Km
 0.1 mH/Km
 0 mH/Km
 0.05 mH/Km

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Power Systems
A cable has inductance of 0.22 mH per km and capacitance of 0.202 µF per km. The surge impedance of the cable is

 52 Ω
 33 Ω
 28 Ω
 40 Ω

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Power Systems
In a power system with negligible resistance, the fault current at a point is 8.00 pu. The series reactance is to be included at the fault point to limit the short circuit. current to 5.00 pu is

 0.200 pu.
  3.000 pu.
 0.075 pu.
 0.125 pu.

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Power Systems
Consider a long, two wire line composed of solid round conductors. The radius of both conductors is 0.25 cm and distance between their centers is 100 cm. If this distance is doubled, then the inductance per unit length.

 Doubled.
 Halves.
 Decrease but does not halves.
  Increase but does not doubled.

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Power Systems
Steady state stability of a power system is improved by

All of these
 using double circuit line instead of single circuit line
 single pole switching
 decreasing generator inertia

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