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Power Systems

Power Systems
Proximity effect is more in case of

 power cables
None of these
 over head lines
 same in both cases

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Power Systems
Steady state stability of a power system is improved by

 using double circuit line instead of single circuit line
All of these
 single pole switching
 decreasing generator inertia

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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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Power Systems
Which of following power plants is free from environmental problem

  Hydroelectric.
 Steam.
 Diesel engine.
 Nuclear.

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Power Systems
The corona loss on a particular system at 60 Hz is 1 kW/km per phase. What is the corona loss at 50 Hz in kW/km per phase?

 1
 1.13
 0.93
 0.882

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Power Systems
For variable heads of near about but less than 30 m, which type of turbines is used hydro power plant

  Kaplan.
 None of above.
 Pelton.
 Francis.

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