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Power Systems

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

 200 Ω
 800 Ω
 400 Ω
 160 Ω

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Power Systems
To improve the efficiency of thermal power plant ________________ is placed between boiler and turbine.

  ash handling point.
  air preheater.
  economizer.
  superheater.

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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?

 5 pu
 3.535 pu
 7 pu
 5.353 pu

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Power Systems
Equal area criterion gives the information regarding

 absolute stability
 stability region
 relative stability
 swing curves

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Power Systems
Advantages of per unit system is/are

 It has units for all quantities
 No units for any quantity
All of these
 Need of transformation ratio

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Power Systems
Taking the density of water to be 1000 kg/m³, how much power would be developed by a hydro electric generator unit, assume 100% efficiency, with 1 m head and 1 m³/s discharge?

 19.60 kW
 4.45 kW
 9.81 kW
 2.90 kW

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