A three-phase, 4-pole, self excited induction generator is feeding power to a load at a frequency f1. If the load is partially removed, the frequency becomes f2. If the speed of the generator is maintained at 1500 rpm in both the cases, then
1
f1, f2 > 50 and f1 > f2
2
f1 < 50 Hz and f2 > 50 Hz
3
f1, f2 < 50 Hz and f2 > f1
4
f1 > 50 Hz and f2 < 50 Hz