Assume that I have edited one question. Due to reputation limitation my edit goes for review. There either it will be accepted or will be rejected. So can I know who have accepted/rejected my edit? Also can I know the reason for rejection? Also sometimes when I edit some question it shows my edited question, but it shows someone else's name in edited by. Why so?
The approval process does maintain a history of your proposed edits and an audit trail of who reviewed the edit and whether they chose to accept or reject. For example here are three recent edits you suggested.
The suggested edit process is still in development, so there is no easy way for you to find the link to your suggested edits if they are rejected. They don't show up on your activity page (and we don't know yet if they ever will).
Only the most recent editor is displayed on the post itself. The reason your name doesn't show up on the post even though you edited it is because someone else has made further edits to the post. (And in one case the OP rolled back what you had changed.) You can see the revision history by clicking the time next to the word
edited... on the post.