PhD is a Doctorate course and can be done by candidates from any stream and any specialization. PhD Mechanical Engineering is research based course specifically for Mechanical Engineers and deals only with the study of Mechanical Engineering related topics.
In this course, candidates need to select a unique topic after study of lots of available literature and then need to conduct a research under the guidance of his or her supervisor.
Admission for PhD includes many different modes like self paid, sponsorship and even through scholarship.
In case of self paid PhD, candidate needs to search a topic of his/her interest and then contact the guide for that.
For sponsorship, the procedure is almost similar, but the work will be sponsored by institute.
Lastly, the scholarship option is open for meritorious candidates who qualify all India tests with excellent scores.