Hello Navneeth

All the five old IITs,

IIT Bombay, IIT Delhi, IIT Kanpur, IIT Madras, IIT Kharagpur, 

are almost same if you consider mechanical engineering department.

But still if you want to compare them, Then IIT Delhi has best mechanical engineerin department among all other.

IIT Kanpur too.

HELLO! NAVNEETH P SAGAR.

SEE THEIR ARE MANY COLLEGE FOR MECHANICAL ENGINEERING IN INDIA. SO ACCORDING TO RANKING LIST ARE GIVEN BELOW:

1) IIT MADRAS

2) IIT DELHI

3) IIT BOMBAY

4) IIT KHARAGPUR

5) IIT ROORKEE

6) IIT GUWAHATI

7) CEG- COLLEGE OF ENGINEERING GUINDY 

8) IIT HYDERABAD

9) BITS PILANI

10) NIT TRICHY

11) IIT DHANBAD

12) JADAVPUR UNIVERSITY

13) VIT UNIVERSITY

14) NIT ROURKELA

15) NSIT- NETAJI SUBHAS UNIVERSITY OF TECHNOLOGY

16) NIT SURATHKAL

17) BIT MESRA

18) THAPAR INSTITUTE OF ENGINEERING AND TECHNOLOGY

19) IIT VARANASI

20) IIEST SHIBPUR

ALL THE BEST.