What hinges it is better to place on the interior doors : Butt Hinge
Quote from Article entitled What hinges it is better to place on the interior doors:
Above it, a preliminary determination of the hinges locations will help to select their number. Usual location involves two universal right or left hinges for standard leaves - two hinges are installed at the bottom and one at the top, for light doors - three hinges at equal distances. Heavy doors are equipped with four hinges, which are installed in pairs at the top and at the bottom of leaves. The functionality of a door by height of 2.1m can be achieved by setting of four hinges.
The full version of the article can be found here.