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Power Systems

Power Systems
Proximity effect is more in case of

 same in both cases
 over head lines
None of these
 power cables

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Power Systems
Sparse matrix is matrix which contain

 more number of zeros
 more number of non zeros
 more number of memory elements
 less number of memory elements

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Power Systems
In which power plant, the thermal efficiency is quite low

  Hydro power plant.
  Diesel power plant.
  Nuclear power plant.
  Steam power plant.

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Power Systems
The amount of ash content in Indian coal

 20 %.
  60 %.
 35 %.
  45 %.

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Power Systems
In a 3-phase transmission line, each phase is supported by 3 insulated discs, maximum voltage of each disc is 20 kV. Find the operating voltage of the transmission line per phase if efficiency of string is 80.6%.

 83.76 kV
 20 kV
 48.36 kV
 52.84 kV

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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

 100, 0.4
 4, 10
 100, 10
 4, 0.4

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