Punjab Engineering College, Chandigarh

Your rank is very good. You will easily get this college with your desired branch. Try JEE college predictor to get more information and insight about college & branch which you can get on the basis of your rank:-
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Predict engineering colleges you can get on the basis of your JEE Rank. Use Shiksha JEE college predictor: https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor?utm_source=cconnect&utm_medium=CR_JEECP&utm_campaign=7489993.

No, GATE is not compulsory for Ph. D. GATE is just if you want to do your higher studies in IIT's or NIT's and it also counts in government jobs. But it doesn't matters if you have written or cleared GATE you can definitely go for Ph.D.

It depends. 50% of the seats are reserved in terms of Chandigarh quota. Else you can check the last year closing ranks in the internet.

The college has its high reputation in terms of civil engineering. The faculties of civil engineering department has high amount of expertise and moreover, civil is the oldest branch of this college. So, overall, it is a good college for civil engineering but only the placements are 80%.

Placement percentage of CSE at PEC Chandigarh is 100%. The highest package this time was of 34 lacs per annum.

No, you cannot get admission in PEC without JEE Mains.