A lecture theatre is a large room used for instruction, typically at a college or university. In Mechanical Engineering Department of RUET, a lecture theatre has been built to conduct workshop, seminar, presentation and special programs of the department. It is capable of accommodating from 75 to 80 persons. This lecture theatre is excellent for focusing the attention of a large group on a single point. A microphone and loudspeakers are common here to help the lecturer be heard, and projection screens are used for large displays.