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Power Systems

Power Systems
Condition for maximum voltage regulation

 tanφ = X/R
 tanφ = R/X
 cosφ = R/X
 cosφ = X/R

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

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

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Power Systems
Mho relay is used for protection of

  medium lines.
  none of these.
  long lines.
  short lines.

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Power Systems
If, for a given alternator in economic operation mode, the incremental cost is given by (0.012 P + 8) Rs/MWh, dPL/dP = 0.2 and plant λ = 25, then power generation is

 1500 MW
 1000 MW
 1250 MW
 750 MW

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Power Systems
Length of the cable is doubled, its capacitance C will be

 one-fourth.
 unchanged.
 doubled.
 one-half.

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Power Systems
Aluminium is now most commonly employed conductor material in transmission lines than copper because

 costlier
 its tensile strength is more
 it is cheaper and lighter
 it is more conductive

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