One of six generators on a large cruise ship was repaired and brought back online by synchronizing with other five generators, which in a group can be assumed to make an infinite bus for the incoming generator. The incoming generator has the synchronous reactance X_s = 1.5 pu, V_T = 1.0 pu, and the field current I_f = 1000 A at the time of synchronization. After synchronization, while keeping the field current unchanged, the steam valves are adjusted such that it delivers 0.2 pu of its rated power.

1. Determine the armature current in per unit (pu) value when delivering 20% power with rated I_f = 1000 A.

2. If the field current I_f is now increased by 60% while keeping the steam input the same (i.e., the power output unchanged), determine the new armature current in pu value.