Parafin, white sprite, transformer oil. The dielectric system includes the water reservoir, filtration system, deionization system, and water chiller unit. effective cooling medium (coolant) carry the swarf particles away from the working gap (flushing medium) 5. a) 0.01 to 0.05 mm a) Grinding machine b) Decrease in Current View Answer, 10. a) Holes Explanation: Dielectric in EDM is used for flushing away the debris generated during the process of machining, which may slow down the material removal rate if not removed instantly. d) Wood Dielectrics MCQs: Get access to mcq on Dielectrics for NEET 2021 with answers. POWER SYSTEM PROTECTION MCQ_03. The machine makes use of the erosive effects of electrical discharges, first observed in the year 1770. View Answer, 2. View Answer, 6. c) Plastic b) Rubber d) 10 to 15 mm Some water drops go into the narrow machining gap while the other drops on the workpiece surface are blown away by the compressed air, as illustrated in Figure 19. Sanfoundry Global Education & Learning Series – Advanced Machining. Water is used to push chips and debris out of the Wire slot and cool the Wire and workpiece. EDM Circuits and Working Principles (With Diagram) 4. a) 0.1 mm/min Ans: d. 8. a) Interior hole Introduction to Electric Discharge Machining (EDM) 2. b) Simple shapes View Answer. i. c) Carbides b) Milling machine View Answer, 10. Ans: d d) 0.7 mm/min a) Steel band 1. c) Steel band & Disc a) Flushing away the debris a) True What are range of diameter values obtained by drilling using EDM? EDM. View Answer, 14. View Answer, 7. View Answer, 12. As long as a material is conductive, it can be punched, drilled or cut, using a normal EDM. b) 20% It was reported that the EDM drilling could be feasible with gases if argon and helium used as the dielectric medium [5]. d) 0.432 to 0.568 mm b) To make the medium conducting 7. Kunieda et al. [6] a) Irregular a) Increase in melting point of work piece NASA published first research paper on dry EDM process in 1985. heating used is (a) arc heating (b) resistance heating (c) induction heating (d) dielectric heating Ans: b. The tool and the work material are immersed in a dielectric medium. How much amount of burr is produce while machined using Electro discharge sawing? MCQ; This is the Multiple Choice Questions in Chapter 8: Radiation and Propagation of Waves from the book Electronic Communication Systems by George Kennedy. c) Wire and Sinker EDM both c) 65 View Answer, 13. This is the Multiple Choice Questions in Chapter 10: Waveguides, Resonators and Components from the book Electronic Communication Systems by George Kennedy. 108. Which of the following EDM machine is used for cutting shapes cut out of a flat sheet or plate of metal? Participate in the Sanfoundry Certification contest to get free Certificate of Merit. d) Five a) Iron The electric field strength in the voids is a. d) None of the mentioned d) None of the mentioned To practice all areas of Manufacturing Engineering, here is complete set of 1000+ Multiple Choice Questions and Answers. Which type of holes can be produced through drilling using Electro discharge machining? a) Wire EDM Role of Tool Electrode and Dielectric Fluids in EDM 6. View Answer, 15. Any electrical conductor can be machined by this method. Keywords: Dielectric fluid, Electrode, Electrical discharge machining, Material removal rate, Tool wear rate ----- Date of Submission: 04-01-2019 Date of acceptance: 21-01-2019 ----- I. “In advanced machining processes, the incorporation of EDM with CIM increased the length of time for unit operation.” In a domestic cake baking oven the temperature is controlled by (a) voltage variation (b) thermostat (c) auto-transformer (d) series-parallel operation Ans: d. 27. In an EDM machine, metal removal rate is 1.937 cubic mm / min. c) 309 Material removal rate in EDM increases with d) None of the mentioned View Answer, 2. View Answer, 8. b) Increase in Current It serves several purposes: It acts as a semiconductor between the energized wire and the workpiece to maintain stable and controlled conditions for ionization in the spark gap. d) 402 View Answer, 9. c) All of the mentioned The minimum dielectric stress in a cable is at (a) armour (b) bedding (c) conductor surface (d) lead sheath . EDM is thermoelectric process used to machine any electrically conductive material irrespective of its hardness and appears to be suitable alternate for machining of Ti6Al4V. In EDM, a potential difference is applied between the tool and workpiece. b) Aluminum Which of the following material can be machined using electronic discharge machine? If you are looking for a reviewer in Communications Engineering this will definitely help. ECM. Q.31 In circuit breaker, if the dielectric strength of the medium between two contacts build up more rapidly than the restriking voltage___ A. the arc will continue and current cannot be interrupted Medium through a dielectric medium and dry EDM process in 1985 which has been used! The former is necessary to develop the electric field in dielectric push chips and debris of... Be punched, drilled or CUT, using a normal EDM following EDM machine, metal removal is. Electrode in drilling in EDM Waves from the workpiece within the medium increased... 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