Bachelors

Dear Amit,
The basic eligibility for pursuing a Masters degree in Mechanical is successfully completing a bachelor's degree in (B.E/B.Tech) or any other equivalent degree in relevant branches of engineering. The duration for the course is 2 years.
For the list of institute, refer to the below link
https://engineering.shiksha.com/me-mtech-in-mechanical-engineering-in-delhi-ncr-categorypage-2-59-587-0-0-10223-1-2-0-none-1-0#cateSearchBlock
(In the above link, you can refine the search as per your preferred city)
Admissions are usually done on the basis of entrance examinations. In order to get the exact details, it is advised to get in touch with the institute officials directly.
Some of its specialized fields in Mechanical engineering are: -
Tribology
Nanotechnology
Micro Electro Mechanical Systems
Structural Analysis
Kinematics
Computer-Aided Design and Manufacturing
Production Engineering
etc.
Mechanical engineering has a lot of scope in India and abroad. Some of the areas where these people can utilize their capabilities include the following.
Automobile industry
Aerospace industry
Steel plants
Power generation industries
Communication sector
Railway departments
etc.
Some of the government departments where they can apply are:
ONGC
VSSC
ISRO
IOC
DRDO
SAIL
NTPC
etc.
Hope this helps
Thanks
All The Best!

Dear Jay,
As you have already done a diploma, you are eligible for seeking lateral entry in B.Tech. One requires to qualify LEET as conducted by the technical education board of the state. Lateral Entry Entrance Tests are conducted on state level. But some colleges and Univerities too conduct Lateral Entry Tests. You will get direct admission to 2nd year of B.Tech if you clear the exam.
Some colleges that you can consider are:
Punjab University,Chandigarh.
IP University,Delhi.
Punjabi University,Patiala.
Thapar Institute of Engineering and Technology,Patiala.
KIITS University,Orissa.
Government College of Engineering,Pune.
Punjab Technical University,Jalandhar.
Sant Longoval Institute of Engineering and Technology,Sangrur.
Guru Nanak Dev Engineering College,Ludhiana.
Guru Teg Bahadur Institute of Technology,Malout.
Amity School of Engineering and Technology,Delhi.
etc,
If you are interested in any particular college, you can visit its official website to figure the eligibility criteria for lateral admission to B.Tech courses.
For the list of institutes, refer to the below link
https://engineering.shiksha.com/distance-learning-civil-engineering-in-india-categorypage-2-58-631-0-0-1-1-2-0-none-1-0#cateSearchBlock
(In the above link, you can refine the search as per your city preference)
Hope this helps.
Thanks
All The Best!