What are maximum number of Vlan's created
 

How many vlans can i create in a Fedora Machine?

One more question. Is it hardware dependant or operating system dependant.

Why i am asking because i have dual core's, quad core and core2duo machines.

Expecting some good replies

As VLANs are created over minor-devices in Linux, the limit should be 256 VLANs per ethernet adapter.
Edit: You have to count in that devices like tun/tap, loop are minor devices of an ethernet adapter. So you can have 256 minor devices in total, but most likely not 256 Vlan devices as you need/want other ones, too.