How to tell what generation ipad i have

I dunno.

http://support.apple.com/kb/HT5452

find out your model (the model number is printed on the bottom middle of the back)

http://support.apple.com/kb/HT4992

then find out if your model support siri

If you are running iOS 7.1.1, you have to have the iPad 2 or higher. However, Siri is only available on the iPad 3 or higher.

If you have to ask if you can have Siri, then you probably can't get it because you have an iPad 2. It's really easy to check - go to Settings>General and see if Siri is in the settings.