There are many other factors on which the answer depends like if youhave state quota or not and which branch you want to choose. Even if you compromise with the branch state quota is prime factor here. Below is the closing

Branch                                   State Quota closing rank                                       Other State closing rank

Electrical                                              6449                                                                        10809

Computer Sc.                                       3437                                                                          5379 

Mechanical                                           6027                                                                        12108

You have got chance in electrical or mechanical engineering only. So choose it wisely.

Sorry if you have got 51k rank in OBC category then you can't be able to get admission in Indian institute of science and engineering technology. You need to score atleast 12 k rank in OBC category for iiest shibpur.

All the best