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Power Systems

Power Systems
Find the propagation constant, if impedance is 10Ω and admittance is 10 â„§?

 1
 5
 100
 10

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Power Systems
String efficiency depends upon

 voltage rating of one SCR.
 voltage rating of whole string.
 no. of SCR in the string.
  all of these.

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Power Systems
Which of the following decides the insulation level of 400 kV, EHV line?

 switching over voltage
 skin effect
 lighting voltage
 radio interference

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Power Systems
Two identical synchronous machines having same inertia constant are connected in parallel and swinging together. The effective inertia constant is 4 MJ/MVA. Then each machine has inertia constant of

 4 MJ/MVA
 16 MJ/MVA
 8 MJ/MVA
 2 MJ/MVA

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Power Systems
Water hamming process in pen-stocks results in

  noise increases, pressure increases, velocity decreases.
  noise increases.
  pressure increases.
None of these

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Power Systems
In a Gauss Seidel load flow method, the number of iterations may be reduced if the correction in voltage at each bus is multiplied by

 Acceleration factor
 Lagrange multiplier
 Gauss constant
 Blocking factor

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