See Diploma in Mechanical Engineering isn't offered in any distance mode by most of the college. SO if you wish to pursue this course, you need to do it in a Regular mode. Diploma In Mechanical Engineering have a good requirement in different factories with high power manufacturing units.

Some of the top Diploma in Mechanical Engineering colleges are provided below:

LPU Jalandhar - Lovely Professional University

MSU Baroda - Maharaja Sayajirao University of Baroda

JMI New Delhi - Jamia Millia Islamia

VJTI Mumbai - Veermata Jijabai Technological Institute

Techno India University, Kolkata

Integral University, Lucknow

For more colleges, visit the link below:

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

I hope this answer helps. All the very best for your future endeavors!