hi,

see the area you have mentioned in the question like automobile, aviation both of the work has needs for electronics engineer or instrumentation engineer. however there is no surety that the recruitment comes every year in those field. in india there is very less growth in automobiles company or in aviation company. because there is less of manufacturing sector. however there is many company available who makes Integrated chip design, pcb design, software development in where you would get decent paying roles. however before joining any stream you have to think whether the subjects interest you or not, rather than thinking about job roles. however also select college by researching the placement records, students review.

hope you may understand.