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Power Systems

Power Systems
Find the value of a729, where "a" is the operator

 α²
 1
 α
 0

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Power Systems
Pelton wheel turbine is a

  medium head turbine.
  high head turbine.
  none of above.
  low head turbine.

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Power Systems
Earth fault relay uses the which of the following sequence currents?

 zero sequence
 positive sequence
 negative sequence
 any of the above

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Power Systems
The pu parameters for a 500 MVA machine on its own base are: Inertia, H = 20 pu; reactance X = 2 pu. The pu values of inertia and reactance on 100 MVA common base, respectively, are

 4, 0.4
 4, 10
 100, 0.4
 100, 10

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Power Systems
A string insulator has 4 units. The voltage across bottom most unit is 10 kV and its efficiency is 90%. Find the total operating phase voltage?

 32 kV
 45 kV
 40 kV
 36 kV

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Power Systems
A penstock is used as a condition between

 the turbine and discharge drain.
  the dam and the turbine in a hydro station.
 none of above.
 the heat ex-changer and the turbine in nuclear power plant.

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