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Power Systems

Power Systems
Where air circuit breakers are used?

  Up to 11 kV.
  Up to 12 kV.
  Up to 66 kV.
  Up to 33 kV.

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Power Systems
Direct conversion of heat energy into electrical energy is possible through

 Fuel or solar cell.
 Thermal converters.
 MHD generator.
 Both A and C.

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Power Systems
Which of the following represents the transmission or reflection coefficient of voltage Tv? (Zl = Surge impedance of load, Zs = Surge impedance of line)

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

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Power Systems
Which of following generating plants has the minimum operating cost

 Nuclear plant.
 Steam plant.
 Diesel plant.
 Hydroelectric plant.

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Power Systems
Offset mho relay is used for the protection of equipment when

 either 1 or 2
 loss of excitation of the generator
 failure of prime mover of the generator
None of these

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Power Systems
Which of the following plants has the maximum eapital cost

 Steam plants.
 Hydro-plants.
  Nuclear plants.
 Diesel plants.

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