What is the cut off mark for Mech. in PEC i am belongs to OBC and my merit mark is 145.66 and my OBC merit rank is 887.
First of congratulations for securing a decent rank.And if am not wrong your OBC merit mark is 145.66 and OBC merit rank is 887.
So first of all let me tell you PEC has no provision for reservation to other backward classes (OBCs) at the institute for admissions to undergraduate and postgraduate courses. So your OBC merit rank or marks would not be considered in that case. Now as per the last year records opening and closing rank of Mechanical Engineering in PEC were 14922-30804 under general category. Since you have not mentioned your general rank so am not concluding anything here, but with the help of above information you can compare your general rank to check your eligibility.
Neverthless you may check the different NITs cutoff using this link: https://engineering.careers360.com/articles/nits-cutoff-for-top-btech-branches
You can also try for other best colleges using college predictor tool to get the best college out there for you based on your rank. Required link is here: https://engineering.careers360.com/jee-main-college-predictor?icn=QnA&ici=qna_answer
All the best!!