Hello Sai Ram Pendyala,

Congrats on clearing JEE mains with a decent rank. Based on your rank you can expect following NITs

• NIT Mizoram, Civil, ENTC, Mech, CS
• NIT Uttarakhand, Civil, Electrical and Electronics
• NIT Agartala, Mathematics (Bachelor of science dual degree), Chemical, Production, Bio-Engineering, CS, Civil, Mechanical
• SVNIT Surat, Physics, Chemisrty, Industrial and prod engg
• NIT Srinagar, Entc, Electrical,Chemical, Mech, CS, Civil, IT
• NIT Raipur, Biomedical Engineering, Chemical, Bio Technology, Metallurgical, Mining Engineering
• NIT Meghalaya, CS, Mech, Civil, ENTC
• NIT Manipur, Electrical, ENTC, Mech, Civil, CS
• NIT Jalandhar, Textile Technology, Chemical
• NIT Arunachal Pradesh, Electrical, Civil, Mechanical, CS
• NIT Silchar, Civil, ENTC, Electrical
• NIT Sikkim, Mechanical, Civil, ENTC, CS
• NIT Harmipur CS, Material Science, Civil, Chemical, ENtC, Mechanical
• NIT Goa, ENTC, Electrical and Electronics
• NIT Puducherry, CS, Civil, Mech, Electrical and Electronics
• NIT Rourkela, Food Process, Mathematics

With 47000 rank some suggestions according to the previous trends are

• InformationTechnology,NIT Srinagar
• Mining Engineering, NIT Raipur
• Civil Engineering, NIT Uttarakhand
• Chemical Engineering, NIT Andhra Pradesh 
• Bio Technology, NIT Raipur
• Metallurgical Engineering, NIT Raipur
• Cse, NIT Srinagar
• Mechanical Engineering, NIT Meghalaya
• Chemical Engineering, NIT Raipur

Here are some suggestions..if you can specify the subject you are interested in..better research can be done.

Thank you