Diploma

Yes, you can do housekeeping or hospitality diploma programme from the RIMT University in Punjab. This course is one certificate programme, i will give you direct link for this course. http://rimt.ac.in/certificate-program-pg-in-hospitality-management.php

Yes, you are eligible. If you have completed your class 12th or schooling with minimum aggregate of 50% marks. If you are searching to get admission in any private BCA college, then you should have this minimum aggregate. You will get admission in 1st year, and then you'll study for three years because BCA is a three year complete graduation course.

A Diploma student is considered equivalent to class 12th, and needs to clear NATA with a minimum score of 80/200 to be eligible for Architecture admission.

For fee-related queries, I would request you directly get in touch with the college officials.
Chennai Campus
AAT Academy (I) Ltd., No.3 & 5, Raja Street, "Studio and Campus" T.Nagar, Near Agasthiar Kovil, Chennai- 600017.

Yes, a mechanical Diploma holder can join Mechatronics in lateral entry scheme.

Please ask your question in details.

PGDBM is a PG course not a graduation. It is also surprising that you have been able to pursue PG despite having a graduation degree. Generally, the highest qualification is considered. However, if you still need graduation then you need to apply through distance. You are eligible for a distance programme of UG, but it will take you at least 3 years to complete the same.

For ATC, one needs to appear for the exam conducted by AAI, and the minimum required qualification for the same is BE electronic as on the date. Having Diploma in aeronautical would fetch you lower job of ground duty, but not ATC.

This year onwards, IPM will be a graduate degree. So, you won't be facing any issue, be it giving entrance exams such as UPSC, or doing Ph.D.