can a engineer earn 10 crore per year
See the students graduating from the IIT all don't get the package of crores, but some students get 1-2crore per year CTC which is not that the student earn 1-2 crore money but the company in various terms have the cost to keep the employee is Rs. 1-2 crore.
Now, it can be a case, if you become CEO or anything like that then you can expect such lumpsum yearly package but in general, the packages aren't that much. In general, the average package is around Rs. 4 to 10 LPA per annum in India and in abroad its around Rs. 20-30 LPA or a slight more as per the currency of that country.
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I hope this answer helps. All the very best for your future endeavors!