AC load driving using FET
If anyone have any idea to do this, please help me out


You can do this with a triac and opto-couplers: -



Here's another idea using a 555 timer: -



Note that this is only good for a few hundred watts - you'd need a more powerful triac and drive interface for 2 kW. The circuit below might give you 1 kW: -



Looking around at triacs I think the BTA41 should be man enough for the job.