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Power Systems

Power Systems
For large plants of capacity for more than 15 MW, what type of cooling is used

  Air.
  Hydrogen.
  Liquid.
  Water.

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Power Systems
Which of the following is/are the stator faults?

 Inter phase faults
All of these
 over current
 failure of excitation

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Power Systems
The total number of strands in a ACSR conductor are 7, then find the layer number?

 3
 5
 7
 2

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Power Systems
A buchholz relay is used for

 nether 1 nor 2
 protection of a transformer against all internal faults
 protection of a transformer against all external faults
 both 1 and 2

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Power Systems
Reflection coefficient of voltage is Rv

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

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Power Systems
To improve the efficiency of thermal power plant ________________ is placed between boiler and turbine.

  ash handling point.
  superheater.
  air preheater.
  economizer.

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