purchase of books , library books ( refer nit ) , refrigeration and air conditioning , machine design data book , mass-transfer operation , engineering drawing with an introduction to autocad , hydrauliucmachines , engineering geology , electromagnetics with applications , power system stability and control , communication systems , communication systems , communication networks fundamental concept and key architectures , digital electronics , advanced microprocessors and peripherals , vibration and acoustics , communication system analog and digital , data structures , operating systems , computer organization , data structures with applications , problems solving and python programming , cloud computing , quantitative aptitude => limited