courses to become a Engineer

Mechatronics - Control Technology - Pneumatic-Hydraulic
Practical Fundamentals HVAC
Mechatronics and Remote Engineering - Robot Mechanics
Mechatronics and Remote Engineering - Analog Circuit Design.

Hello,
Could you please specify which specific stream you are looking out for?

No, it is not necessary, but you can get better job opportunities.

Hello,
After getting Diploma, if you cannot do BE/B.Tech regularly, then there is an option AMIE (distance education), it is degree course. The syllabus of AMIE is similar to B.E/B.Tech. The AMIE syllabus has two parts: - Section A and Section B (similar to First year, Second year etc. Of any formal

First of all, I want to say that all programs of mechanical are the best. You have to find your interest. As per your question, I am listing out some branches of Mechanical Engineering, find your interest and get in-depth knowledge of it.
Acoustical Engineering-Concerns the manipulation and control

Both are same. There is no difference in course and programme. This both defines the degree and time duration of any particular course. Don't get confused.

Yes, Masters courses consist of thesis or project. It is not easy as undergraduates but yes they will guide you how to do this but that's project in master will mostly applications based. So don't worry once you enter in good college everything will get set up automatically.
Good luck.

It will take 4 years.