What hinges it is better to place on the interior doors : Blind Hinges
Quote from Article entitled What hinges it is better to place on the interior doors:
To choose a right hinge, it is necessary to think about their size beforehand. For hollow, frame doors and the doors with honeycomb, weighting 10-25kg, hinge sizes are 7.5 cm by height. For the standard doors, weighting 25-40kg, the size needed is H=10 cm fit, the hinge size H=10cm with D=6 cm are designed for heavy leaves, weighting above 40kg.
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