Hi Praveen,
If you want to do a part-time diploma in Mechanical Engineering field in Chennai, you can opt for the PSB Polytechnic College in Chennai.It will be a course of duration four years.
For more details about this course like eligibility and fees, please refer this website:
https://www.careers360.com/colleges/psb-polytechnic-college-chennai/diploma-in-mechanical-engineering-part-time-course
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