Hello

Few old IIT's have provision of interviews and few of them don't have. IIT Delhi , IIT Bombay , IIT Kanpur take interviews every year (IITB and IITD take direct addmision also for top 50-100 AIR's) but IIT's like IIT Roorkee, IIT Madras , IIT Guwahati don't conduct interviews for MTech Program.

but you don't worry for interviews even if its there , as the interviewers are looking for your potential(and not skills). If you clear such grounds, congrats there is no happiness better than mind satisfaction.

Hope this helps!!!