The problem states:
An electric generation facility uses a turbine-driven synchronous generator rated 3PH, 150MVA, 13.8-kV.
Per-unit reactances are: X"d=0.15; X'd=0.25; Xd=Xq=1.20
Assume terminal voltage (Et)=1.0 pu.
For a transient stability study at rated MVA, rated voltage, and unity...