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Power Systems

Power Systems
For large plants of capacity for more than 15 MW, what type of cooling is used

  Hydrogen.
  Water.
  Air.
  Liquid.

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Power Systems
The Gauss Seidel load flow method has following disadvantages. Which of the following statement is wrong?

 Choice of slack bus affects the convergence
 Unreliable convergence
 Slow convergence
 A good initial guess for voltages is essential for convergence

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Power Systems
Which of the following relationships are not valid for short transmission lines

 A = D = 1
 Is = Ir
 B = C = Z
All of these

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Power Systems
A 1- phase transmission line operating at 30 kV has radius of 1 cm and distance between conductors is 0.5 m. Assume m = δ =1, g = 21 kV/cm and frequency f = 50 Hz. Find the critical disruptive voltage?

 17.32 kV/phase
 41.075 kV/phase
 82.15 kV/phase
 34.64 kV/phase

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Power Systems
Example of base load stations are

  thermal.
  hydro.
  both A and B.
  gas turbine.

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Power Systems
If a generator of 250 MVA rating has an inertia constant of 6 MJ/MVA, its inertia constant on 100 MVA base is

 10.5 MJ/MVA
 6 MJ/MVA
 2.5 MJ/MVA
 15 MJ/MVA

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