If you join a Diploma in Aerospace Engineering, the fee you pay generally covers the following things: admission fee semester wise tuition (semester fee) book and library charges uniform fee and a caution fee for the course. Some institutes may offer scholarship or fee waiver if you qualify through entrance test like AME CET so net cost could be lower. Hostel fee is normally not included in this main fee. If you choose hostel accommodation you will have to pay extra hostel charges, which depend on facilities.
The Diploma in Aerospace Engineering is a 3-year course divided into 6 semesters. During this period you study core subjects like Aerodynamics Aerospace Propulsion Aerospace Structural Mechanics Aircraft Design Flight Mechanics and other essential aerospace topics. You also get practical knowledge through labs and hands on training which helps in designing manufacturing and testing of aircraft and spacecraft systems.
If you complete this diploma you can get a technical certificate and become eligible for many aerospace sector jobs. It gives deep knowledge of aircraft and spacecraft design manufacturing and testing which can help you in future studies or direct employment. Also many institutes accept this diploma for further studies (for example in B.Tech Aerospace via lateral entry) if you want to continue academic growth.
Fees vary from institute to institute depending on facilities and infrastructure. So you should check exact fee structure for the institute before joining. Hostel and living cost charges are separate so total cost will be more if you need accommodation. Sometimes fees may be higher for non resident (NRI) or foreign students in some institutes.