Hello aspirant,
A rank of 755 in AP PGCET is a good score. However, predicting the exact chances of getting a seat in MSc Food Technology at Andhra University without knowing the specific cut-offs is difficult. The following points may affect your admission :
Cut-off Trends: Analyze previous year's cut-offs for MSc Food Technology in Andhra University.
Seat Availability: The number of seats offered for the course will impact the cut-off.
Category: Your OBC category might provide some relaxation in the cut-off.

However, you can go through the following steps:
Check Previous Year Cut-offs: Compare your rank with the previous year's cut-offs for MSc Food Technology in Andhra University. This will give you a better idea of your chances.
Explore Other Options: Keep a backup plan. Look into other universities or colleges offering MSc Food Technology.
Participate in Counseling: Ensure you participate in the counseling process to maximize your chances of securing a seat.

I hope it helps.