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Power Systems

Power Systems
The rating of CB is in terms of

  voltage.
  current.
  volt - ampere.
  VAR.

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Power Systems
In a 3-phase transmission line, each phase is supported by 3 insulated discs, maximum voltage of each disc is 20 kV. Find the operating voltage of the transmission line per phase if efficiency of string is 80.6%.

 48.36 kV
 20 kV
 52.84 kV
 83.76 kV

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Power Systems
A generating station has a maximum demand of 50 MW a load factor of 60 %, a plant capacity factor of 45 % and if the plant while running as per schedule were fully loaded. The daily energy produced will be

 740 MW.
 710 MW.
  720 MW.
 730 MW.

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Power Systems
The positive (Z1), negative (Z2) and zero sequence (Z0) impedances of a transmission line follows the relation

 Z1 = Z2 = Z0
 (Z1 = Z2) < Z0
 any of the above
 (Z1 = Z2) > Z0

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

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

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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 reflected voltage?

 -81.82 kV
 -18.18 kV
 81.82 kV
 18.18 kV

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