A 50 Hz alternator is rated 500 MVA, 20 kV, with Xd = 1.0 pu and X11d = 0.2 pu. It supplies a purely resistive load of 450 MW at 20 kV. The load is connected directly across the generator terminals when a symmetrical fault occurs at the load terminals. The initial rms current in the generator in per unit is
1
1.34 pu
2
4.31 pu
3
3.12 pu
4
6.72 pu