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POWER SYSTEMS

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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Power Systems
Pin insulators are used up to

 11 kV
 120 kV
 33 kV
 any voltage level

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Power Systems
Find the number of insulator discs required in string insulator, if operating voltage is 220 kV and maximum voltage of each disc is 11 kV?

 13
 20
 10
 21

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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
 52.84 kV
 20 kV
 83.76 kV

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Power Systems
A cable has inductance of 0.22 mH per km and capacitance of 0.202 µF per km. The surge impedance of the cable is

 52 Ω
 28 Ω
 40 Ω
 33 Ω

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