Hello vishnuram!!

Your question is incomplete.  Kindly mention the name of the college and state in which you want to apply for the mechanical engineering course so that we can able to give you a clear guidence. If you want to know about college which offers diploma in mechanical engineering kindly refer to the following link below...

https://engineering.careers360.com/colleges/list-of-diploma-in-mechanical-engineering-colleges-in-india

All the best!!

Stay safe!!!

Dear candidate

You forgot to mention about what college you wanted to apply for but generally diploma admission is based on two modes one is merit based and another is that some colleges take admission via entrance exam, so mention your question again by mentioning the college name this time.

Hope this Information is helpful