What is the fee structure of Engineering courses ?

The fee structure vary from institution to institution and depends upon various factors like location, infrastructure etc. Since you have not mentioned any particular college I can give you a general breakdown:

Public engineering colleges: the tution is relatively lower if compared to private institutions. Government- aided  institutions in India like IITs and NITs the fees range from $500 to $ 2000 per year.

Private engineering institutions- tution fees is higher. Can range from $ 2000 to $10000 and even more sometimes.

However the fees can be lowered in  case of scholarship and financial aid like merit- based, need-based and government scholarships.