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Power Systems

Power Systems
India’s largest thermal power station is located at

 Kota.
 Sarni.
 Chandrapur.
 Neyveli.

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Power Systems
Reflection coefficient of voltage is Rv

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

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Power Systems
If the fault current is 2000 A, the relay setting is 50% and CT ratio is 400 : 5, then plug setting multiplier will be

 15.
 25.
 10.
 50.

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Power Systems
Percentage of carbon is highest in

  lignite coal.
  coal gas.
  bituminous coal.
  anthracite coal.

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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)

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

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Power Systems
Advantages of higher transmission voltage is/are

 Transmission line losses are reduced
All of these
 Area of cross section and volume of the conductor is reduced
 Power transfer capability of the transmission line is increased

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