First of all Greeting Formalities to all people present there & then some introduction about family & your self . After that tell about your strengths & your weeknesses but weekness must be told in such a way that it seems to be a positive point to the interviewer.Above all the knowledge that matters all. Take care of your personality also.

Came and had asked some questions. they felt i am very intelligent and would leave for higher education, so i had to convince them i'll continue my job at BHEL and wouldn't drop