Question

change into active voice
Pranav Mukherjee was elected the president of India.

Answer 1

The active voice of the given sentence is as follows:

The electoral college elected Pranav Mukherjee the president of India.

This was an 'object implied' case. Since the President of India is elected by the electoral college. So we supplied the object from our side. The tense was Simple Past, so we used Simple Past tense form of the verb and removed be (was).