1) The limit of Rs 2 Lakhs is applicable on self occupied property and there is no limit on interest on loan in respect of let out properties. Thus you can claim the entire interest of Rs 1,78,181/- on the self occupied property and Rs 2,50,600/- on let out property, aggregating to Rs. 4,28,781/-
2) The issue does not arise, as you are able to claim the entire interest.
3) This issue also does not arise,as you are able to claim the entire interest. Assuming that you don't have any other income and this is the only you have, the loss under the head income from house property can be carried forward and adjusted against income from house property only and not under any other head of income.