Mtech In Industrial Production is best alternative. However, the most paying stream is Mtech In Metallurgy from colleges like ISM dhanbad. There are hummongous opportunities with companies like Vedanta, Schlumberger, Wells fargo, rio tinto, Vale, Tata steel, Hindalco, Essel , Adani Group and pays some handsome salarues for top graduates. 10lakh per annum is average salary. Major roles offered in Mining Controller, Process expert, Total Quality management and Logistics, Shipping management, Production analyst, CAD Expert, etc.

Yes you can do Mtech in a different field irrespective you chose in your btech or not.

Can you specify your query if your doubt is not cleared.