can we get lateral entry admission in B.E. /B.Tech. Mechanical after a three year diploma in Industrial and production engineering?

Hi Sukh Dev, Yes, a student is eligible for a lateral entry to a degree engineering course post the completion of diploma in engineering depending on the availability of the provision in the particular college you are apply to. Most of the engineering institutes in India do have the option for late

Yes you can get admission in 2nd year, but you need to check the vacant seat in the college