Canada

Hi Gaurav, very few universities offer a PG Diploma in Mechanical engineering, as most universities offer a MS. PGD courses are more vocational in nature whereas MS is more research oriented and provides in-depth knowledge and training. If you are planning for Mechanical engineering try for a full time MS from universities such as University of Calgary, University of Waterloo, McMaster University etc. However there is a PGD Mechanical Engineering offered by University of Saskatchewan which is quite popular.
https://ask.shiksha.com/which-college-should-be-preferred-for-pg-diploma-in-mechanical-in-canada-which-university-should-i-prefer-