Poppet valve: Engine valve deriving its name from its motion of popping up and down. It is also called ‘mushroom valve’ due to its shape like a mushroom. Related posts: Personnel Management Operative Functions Administrative Role of PM Competency HR Management Role Change Personnel Policies Personnel Procedures Appealed Policies Implied Policies Specific Policies Personnel records Research Pure research Personnel research Attitude or Opinion Survey Turnover Secondary research Applied research Personnel audit Read more articles Previous PostPlug-in hybrid Next PostPort fuel injection