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Power Systems

Power Systems
For 66 kV lines the number of insulator discs of each 11 kV used are

 6
 12
 3
 5

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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

 10.
 15.
 25.
 50.

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Power Systems
The surge impedance of a 400 km long overhead transmission line is 420 Ω. For a 200 km length of the same line, the surge impedance will be

 210 Ω
 840 Ω
 420 Ω
 400 Ω

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Power Systems
Nuclear power plant are used as

 intermediate load plants.
  base load plants.
 none of above.
 peak load plants.

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Power Systems
The positive sequence reactance will be equal to negative sequence if the equipment is

  motor.
  transformer and transmission lines.
  generator.
  none of these.

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Power Systems
Two insulator discs of identical capacitance value C make up a string for a 22 kV, 50 Hz, single phase overhead line insulation system. If pin to earth capacitance is also C, then find the string efficiency?

 75%
 90%
 86%%
 50%

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