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- Will I be able to check-in the three legs (so the entire trip) and get the three boarding passes in Bangalore at the beginning of my trip?
As you have booked on a single ticket, you should be able to get all your boarding passes at origin or at the transfers desk mid-way. You should not need to leave the transit area. However, you should check with your airline to confirm.
- What would happen if for some reason my flight gets delayed more than the allowed 8-hour time limit?
The airline will usually sort this out. For immigration purposes you may be issued with a special Border (subclass 773) visa to allow you to stay for more than the 8 hour limit.