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Power Systems

Power Systems
Find the surge impedance of a line when inductance is 160 mH and capacitance is 1µF?

 160 Ω
 200 Ω
 800 Ω
 400 Ω

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Power Systems
Objectives of power system is/are

 Cost of electrical energy per KWh is to be minimum
 nether 1 nor 2
 Rated voltage and frequency has to be supplied to the consumers
 both 1 and 2

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Power Systems
A transmission line is compensated with shunt capacitance Csh. If the uncompensated transmission line surge impedance is Zs, then find the new surge impedance Zn after shunt compensation?

All of these
 √(1 + Kcsh)/Zs
 Zs/√(1 + Kcsh)
 Zs*√(1 + Kcsh)

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Power Systems
MCB stands for

  miniature circuit breaker.
  maximum capacity breaker.
  minimum capacity breaker.
  molded circuit breaker.

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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
 83.76 kV
 20 kV

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Power Systems
For accurate load flow calculations on large power systems, the best method is

 G-S method
 N-R method
 Decoupled method
All of these

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