A generator delivers power of 1 pu to an infinite bus through a purely reactive network. The maximum power that could be delivered by generator is 2 pu. A three phase fault occurs at the generator which reduces the generator output to zero. The fault is restored after tc seconds. The maximum swing of rotor angle is found to be max = 110o electrical. The rotor angle at tc is ________ electrical deg.

• A. 69.14^o
• B. 159.14^o
• C. 63.08^o
• D. 65.7^o