If any taxpayer knowingly files a false return, the assessor shall notify the board of equalization thereof in writing. The board on receipt of the notice shall notify the taxpayer of the particulars in which the return is alleged to be false and shall fix a time for a hearing. The taxpayer shall have the right to appear and defend against the charge. If the charge appears unfounded, it shall be dismissed by the board. If it appears that the taxpayer is guilty as charged, the board shall ascertain the true amount and value of all taxable tangible personal property owned or controlled by the taxpayer and shall assess the property as similar property of other taxpayers is assessed. By way of penalty for filing the false return the assessment shall be doubled.