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Power Systems

Power Systems
Mho relay is used for protection of

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

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Power Systems
Advantages of pumped storage plants is/are

All of these
 most economical as a peak load supply plant
 operating time is minimum
 used as load frequency control

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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)

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

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Power Systems
What is the total installed power capacity (MW) in West Bengal as published by ministry of power in 2011?

 6114.05.
 15515.22.
 8113.27.
 10000.32.

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Power Systems
A transmission line has a surge impedance of 400 Ω is connected with the cable having surge impedance of 40 Ω, a surge magnitude of 100 kV is travelling from the transmission line towards the cable. Find the incident current?

 250 A
 100 A
 2500 A
 200 A

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Power Systems
A steam power generation has an overall efficiency of 20 %. 0.6 Kg of coal is burnt per kWh of electrical energy generated. Calculated the calorific value of fuel

 7268.45 KCal / Kg.
 7000 KCal / Kg.
  7166.67 KCal / Kg.
 7562 KCal / Kg.

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