How is an M.Tech in machine design from RV College of Engineering in Bangalore? What about the placements?

There are two aspects to answer your question.

1. Teaching wise: You will be blessed with the best lecturers you can find in and around the state. (Except some)
2. Placement wise: It all depends on the job market during your placement season. If you are lucky enough you will end up with a great placement offer in your hand or else you have to be on your on.