The course of B.E. is designed to cover whole theory and technology (mechanisms) of a system. Let it simply by an example: Suppose we are developing a satellite for xyz purpose. If you are a B.E. degree holder, then you should posses the theoretical domain expertise (with practical knowledge too) of various components used in it like ICs, conductor etc etc. But B.tech course mainly focus on practical training. Means you need not to (much) bother about the history of components used, only you need to be expert to choose the exact components with exact calculation, so that product can deliver efficiently it's purpose. Hope this helps.