Mechanical Engineers can work in thermal power industry, gas turbines industry, air conditioning and refrigeration industry,oil and gas exploration and refining industries, agricultural sector, educational sector, aviation companies, shipping industries,aerospace industry, armed forces, pharmaceutical, automobile industry and many others.

Automation is the latest trending technology in many fields especially in industries like manufacturing, control systems, mining, etc.

Mechanical automation engineering is domain specific whereas mechanical engineering has a wider reach. If you are interested in automation and are designing your career in this particular doamain then go ahead wih mechanical automation engineering.

Good Luck.