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POWER SYSTEMS

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

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

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Power Systems
If a generator of 250 MVA rating has an inertia constant of 6 MJ/MVA, its inertia constant on 100 MVA base is

 2.5 MJ/MVA
 15 MJ/MVA
 6 MJ/MVA
 10.5 MJ/MVA

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Power Systems
If the inertia constant H = 10 MJ/MVA for a 50 MVA generator, the stored energy is

 10 MJ
 50 MJ
 5 MJ
 500 MJ

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Power Systems
Equal area criterion gives the information regarding

 relative stability
 stability region
 swing curves
 absolute stability

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

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

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