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Power Systems

Power Systems
Which turbine is ideally suited to pumped storage plants

 Francis.
  Kaplan.
 Impeller.
 Pelton.

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Power Systems
Four identical alternators each are rated for 20 MVA, 11 KV having a subtransient reactance of 16% are working in parallel. The short circuit level at the busbar is

 400 MVA
 500 MVA
 125 MVA
 100 MVA

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Power Systems
Advantages of higher transmission voltage is/are

 Transmission line losses are reduced
 Area of cross section and volume of the conductor is reduced
All of these
 Power transfer capability of the transmission line is increased

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Power Systems
Ferranti effect occurs under

 half load
 full load
 any of the above
 no load

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Power Systems
For harnessing low variable water heads, the suitable hydraulic turbine with high percentage of reaction and runner adjust vanes is

  Francis.
  Pelton.
  Kaplan.
  Impeller.

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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.

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

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