Hello there

The simple answer of this question from my side would be a big NO .

Yes there might happen that the placements committee would be knowing before the process that which company would be coming out and what they want but that doesn't matter very much on the placement factor as it's totally depend upon the student abilities and their potential.

Yes this I can also say that being a member of the placement committee would be giving you a little amount of advantage.

I hope this helps you!

Thank you!