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Power Systems

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

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

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

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Power Systems
If the frequency is increased, then skin effect will

 decreases
 increases
 remains unaffected
 any of the above

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Power Systems
What should be the minimum depth (in metre)of cable trench to dug for laying of 1.1 kV?

 0.90.
  0.75.
 1.05.
 1.20.

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Power Systems
For 66 kV lines the number of insulator discs of each 11 kV used are

 6
 5
 12
 3

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Power Systems
If the load is short circuited, then reflection coefficient of voltage is

 0
 1
 -2
 -1

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