Which specialization to opt in MBA after completing BE in Electronics?

You should look at specializing in marketing. It will give a huge impetus to your career. I presume you are looking at doing a distance MBA program. You can look at IGNOU, Sikkim Manipal University or Symbiosis (Pune)

Doing MBA immediately is of not much value for engineering graduates. Get work experience in industry and then go for MBA. That will really put you in high positions when you return back to industry.