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Power Systems

Power Systems
The insulation of modern EHV is designed based on

 lightning voltage.
 corona.
 RI.
  switching voltage.

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Power Systems
Transmission line parameters of the short transmission line are

 Z,0,Y,1
 1,Z,0,1
 1,0,Y,1
 1,Z,Y,1

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Power Systems
Which of the following is/are the methods of improving transient stability?

 Fast acting excitation control
 Dynamic breaking
 Fast acting governing system
All of these

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Power Systems
When a nuclear reaction is operating at constant power the multiplication factor is

 may be any of the above.
 less than 1.
  1.
 greater than 1.

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Power Systems
A transmission line has an impedance of (2+j6) Ω has voltage regulation of 10% at a load power factor of 0.8 lag. Find the voltage regulation for a load of 0.6 lead

 -10%
 10%
 6.92%
 -6.92%

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Power Systems
The inertia constant of 100 MVA, 50 Hz, 4 pole generator is 10 MJ/MVA. If the mechanical input to the machine is suddenly raised from 50 MW to 75 MW, the rotor acceleration will be equal to

 225 electrical degrees/s²
 125 electrical degrees/s²
 12.5 electrical degrees/s²
 22.5 electrical degrees/s²

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