Does anyone know samples of 3d animations that is at par or same as standards of what employers hire?

There are a number of software being used for 3d animation for movies and gaming. Among the more common ones are Adobe Creative Suite, AfterEffects, MAYA, 3D Studio Max.

Employers always want you to know Flash [Adobe CS] If you are a student, get software at discount. Online tutorials are available in abundance plus whatever projects you do for any courses you take. After Effects is also an Adobe product. Sometimes they want Premiere for video editing. See if there is an Adobe group in your area to join at no cost.

If you’re looking for examples try searching animation on youtube, there are a huge number of animators and talented amateurs/beginners posting their creations.

I’ve worked in the industry for a while, if you want to see some of my entry-level portfolio check out
http://www.benshore.com/index_3D_OLD.htm
That’s my old stuff, it was all made right after I got my first job out of college making games. Now that I’ve been working 7 years or so my portfolio is this:
http://www.benshore.com/index_3D.htm
That newer stuff is more what it takes to get in at competitive AAA studios, but there are better people than me too, so it’s not a guarantee.

In general just know that studios are trying to hire people who are going to make them look good! If your work isn’t as good as the professional work you see in stores it will be hard to get hired, but if your persistent you can usually get your foot in the door someplace small and work on your portfolio from there.

(oh and I’m not an animator primarily I do modeling and textures, but you can still get a sense of it. For animators you need an animation reel in place of still images)