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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
 400 Ω
 200 Ω
 800 Ω

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Power Systems
Aluminium is now most commonly employed conductor material in transmission lines than copper because

 its tensile strength is more
 it is more conductive
 it is cheaper and lighter
 costlier

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Power Systems
The voltage and current instantaneous values are given as 5 sin (ωt + 30°) pu and 2 sin (ωt - 15°) pu respectively. Find the per unit active power?

 7 pu
 5 pu
 3.535 pu
 5.353 pu

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Power Systems
Which of the following is/are base load plants?

All of these
 hydro plants
 nuclear plants
 thermal plants

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Power Systems
A 3-phase transmission line operating at Vs = 400 kV and has ABCD parameters A= D = 0.8∠0°, B = 100∠90° Ω, C = 0.5*10^-6∠90° â„§. Find the shunt reactor required for compensating ferranti effect?

 500 Ω
 1500 Ω
 3000 Ω
 2000 Ω

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Power Systems
The line current IR flowing into balanced delta connected load is - j5 - 3 A. If the phase sequence is RYB the phase current IYB is

 20.
 10.
  5.
 55.1.

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