One video shows a student, stripped to his underwear and in tears, being forced to dance while dozens of students watch and click photos of him with their phones.
Another showed a boy held up by two students while others rained kicks on his backside.
This is the second time the NIT has become embroiled in a ragging controversy.
Last August, students from Nepal had complained that ragging had taken a sadistic turn and this March, juniors and seniors clashed after the former were locked up in a room and made to dance naked. Those who refused were allegedly beaten.