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Power Systems

Power Systems
Based on the discharge, Kaplan turbine will discharge

 1000 lpm
 >10000 lpm

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Power Systems
Which of the following represents the transmission or reflection coefficient of voltage Tv? (Zl = Surge impedance of load, Zs = Surge impedance of line)

 2Zs/(Zs + Zl)
 2Zl/(Zs + Zl)
 (Zl - Zs)/(Zs + Zl)
 (Zs - Zl)/(Zs + Zl)

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Power Systems
The positive (Z1), negative (Z2) and zero sequence (Z0) impedances of a transmission line follows the relation

 any of the above
 Z1 = Z2 = Z0
 (Z1 = Z2) > Z0
 (Z1 = Z2) < Z0

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Power Systems
If sag in an overhead line increase, tension in the line

 decrease
None of these
 remains same
 increase

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Power Systems
What will be the ratio of the C.T. on the H.V side of a 3 - φ star / delta 33 / 11 kV transformer if the protecting CT on the LV side has a ratio of 300 : 5 ?

 120 : 6 / √3.
 150 : 4 / √3.
  100 : 5 / √3.
  200 : 5 / √3.

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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.

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

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