What is the future after you are placed from the NITIE Mumbai (PGDIE)? Is growth better in a mechanical core job or an industrial engineer job?

The Post Graduate Diploma in Industrial Engineering (PGDIE) course offered by NITIE Mumbai is a management-level course. So growth opportunities are very good. 

• NITIE Mumbai will definitely offer you a very good opportunity to work with some of the biggest companies in India. 
• These companies include HUL, ITC Ltd., Amazon, P&G, KPMG, Deloitte, and many other nationalized and private banks as well as other financial institutions.
• It then depends on your own performance how you utilize them and go up the ladder. 

As this is a management level program it does not really matter whether you are from mechanical engineering or industrial engineering or some other. The college gives equal opportunities to all. After you reach a certain level, technical expertise becomes less and less relevant.