B.Tech. lvsemester (Main/Back) Examination, June/July - 2015 Mechanical Engg. 4ME3A: Machining & Machine Tools N :f, t-{ !+ trl s Time : 3 Hours Maximum Marks : 80 Min. Passing Marks : 26 Instructions to Candidates: Attempt any live questions, selecting one question from each unit' All questions carry equal marks. (Schematic diagrams must be shown wherever necessar))' Any data you feel missing suitably be assumed and stated clearly' (Jnits of quantities used/calculated must be stated clearly. Unit - I Explain the concept of generatrix and directrix. Explain tool geometry of milling cutter and drills' OR 1. a) Explain geometry of single point cutting tool with significance oftool angles' exptain various tool nomenclatures and their interrelationship. (8) b) Explain mechanics of metal cutting and discuss various theories of metal l. a) b) (8) (8) cutting. ,l .L. Write short notes on: Unit - II (8) (16) a) b) Machinability Tool life and tool wear OR Z. a) Define cutting fluid and their roles. What are the types of cutting fluids used while machining. And what properties machinist looking into cutting fluids while selectingthem. (8) 4F,4142 lzors (1) IContd....