Rejoining after having tendered technical resignation

You can rejoin your organisation whenever you are relieved from the other post / department /organisation.

have you joined new post?     

Actually i was working as Data Entry Operator in Election Department n there i tendered technical resignation in june this year to join panchayat secretary in Rural Development Department but now i want to revert back...

Yes.  You can.

Yes, in most cases, you can rejoin your parent department after submitting a "technical resignation" as it is considered a formality when applying for a position in another government department, meaning you can usually revert back to your original position if you choose to do so within a specified timeframe, depending on the specific rules of your organization.