This book contains the research work on performance evaluation of a multipurpose conductive rotary dryer adapted for drying Ogi. It consists of a detailed description of the operating principle, construction materials used as well as their limitations, and performance evaluation calculations and procedure. The rotary drum dryer having an internal rotating body was powered by an electric motor and gas cylinder connected to gas burner attached to the dryer was used for the supply of heat to the drum for the drying of wet Ogi.The developed dryer is effective for drying agricultural product.