What stream will pay high starting salary to a M.Tech- mechanical, aerospace, aeronautical or petroleum after B.Tech in Mechanical?

The starting salary after completing an M.Tech in Mechanical, Aerospace, Aeronautical, or Petroleum Engineering will depend on various factors such as your academic background, the institute you graduate from, and the demand for your skill set in the job market. That being said, here are some genera

Aerospace is a specialised branch of engineering which deals with the design and development of aircraft's as well as space crafts The course curriculum covers aspects of two branches of engineering - Aeronautical and Astronautical engineering. The course also focuses on new technologies in aviation

I think these branch have very limited job in good firms/government so salary is not a issue. You should focus on your academic knowledge, FEM software etc