I have created a custom Post Type, and Registered it.
Can someone help me how to enable revisions to Custom Post type?
When you register your CPT, you need to manually add support for revisions. Only title and editor are set as defaults. Check out the codex. So if you need to enable revisions, you need to add it like this
Just for info, here are the other arguments you can pass to 'supports'
Thanks to @jammypeach, it is important to know, the revision metabox will not show up until there are actually revisions for the post. If there are no revisions, the revision meta box will not show