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Power Systems

Power Systems
Range of accelerating factor is

 1 to 10
 1.6 to 1.8
 50 to 100
 10.8 to 11.2

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Power Systems
A transmission line has impedance of (0.005 + j0.05) pu. Find the line at which maximum value of negative DC off set current is produced, if it is applied with Vm sinωt?

 4.68 msec
 2.63 msec
 9.68 msec
 1.47 msec

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Power Systems
The average thermal efficiency of a modern nuclear power plant is about

 60 %.
  30 %.
 80 %.
 40 %.

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Power Systems
Equal area criterion gives the information regarding

 stability region
 absolute stability
 swing curves
 relative stability

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Power Systems
Reflection coefficient of voltage is Rv

 2Zs/(Zs + Zl)
 2Zl/(Zs + Zl)
 (Zl - Zs)/(Zs + Zl)
 (Zs - Zl)/(Zs + Zl)

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Power Systems
A 1- phase transmission line operating at 30 kV has radius of 1 cm and distance between conductors is 0.5 m. Assume m = δ =1, g = 21 kV/cm and frequency f = 50 Hz. Find the critical disruptive voltage?

 17.32 kV/phase
 41.075 kV/phase
 82.15 kV/phase
 34.64 kV/phase

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