Hi aspirant ,

NIT Hamirpur , is not affiliated with HP University . NIT's are institute of national importance , they are not affiliated to any state university . they are autonomous. they come under central government (50%) and state government (50%) partnership. They are made through act of parliament. Admission in B.Tech in NIT Hamirpur is done through JEE MAIN examination through JOSAA counselling.  .Yes this institute is very good in terms of placement and academics.

hope this helps you

best of luck