A 4 pole synchronous generator rated 110 MVA 12.5 kV, 50 Hz has an inertia constant of 5.5 MJ / MVA.
Which of the following is / are true?1
The stored energy in the rotor at synchronous speed is 605 MJ
2
When the generator is supplying a load of 75 MW and the input is increased by 10 MW, the rotor acceleration is 148.81 ele-deg / sec2
3
The stored energy in the rotor at synchronous speed is 550 MJ
4
When the generator is supplying a load of 75 MW and the input is increased by 10 MW, the rotor acceleration is 371.45 elec deg / sec2