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Hi,
In order to pursue Phd from universities in US, you need to first of all make a list of the universities that you aspire for, then send emails to respective course department, asking them to provide you the eligibility criteria and selection procedure for PHD students
It may take three to six years to complete your PHD, depending on the field you select and your mentor.
The general eligibility criteria for PHD students are as follows :(though it may vary from university to university)
In majority of the institutes, Master's Degree is an essential pre-requisite for a Ph.D. while others admit graduates too
It is important that you have good scores in common entrance tests such as GRE and English Language examinations like TOEFL
Internships or other work experience will add to your qualifications.
Ph.D. course work essentially includes research and documentation work. This requires large amounts of money. In addition to this, you have to consider living expenses for the entire duration of the course. The annual expenses of most Ph.D. students are about $28,000-$40,000 per year.
For any further clarification do post your query , in case your query is resolved please close the question by marking it as best answer or liking it.

Hi Sanjay,
As far I would know about this course, there are hardly any Universities / Institutes offering M.tech degree through the Distance/ correspondence mode, but then you may refer to the following link which contains the list of institutes that offers correspondence M.tech but is a few specializations that are not known and to know about these, one requires to contact the institutes directly:
http://tinyurl.com/254m7mk
But getting the specialization in Power System is least of possibilities and so, I would advise you to go for the Regular education.
Kindly revert for any further queries, also if you liked this answer then rate it 'Best answer' or give a 'Thumbs Up' rating.
All the best!

Hi Ajay,
MBA in itself is a degree and cannot be pursued as a certificate course. You can opt for pursuing MBA degree after MBBS course and may opt for a certification of your interest. Coming from the medicine field you can opt for the courses like MBA in Hospital management or in health care.
There are a few good institutes offering these courses and to know about these, you may refer to the following links:
http://tinyurl.com/2g35bp9
http://tinyurl.com/ycjwwos
Further I would advise you not to opt for the correspondence education and instead opt for the regular studies only as the same is far more beneficial and valued as compared to the distance course.
Kindly revert for any further queries, also if you liked this answer then rate it 'Best answer' or give a 'Thumbs Up' rating.
All the Best!