b) Electro discharge Manufacturing effectiveness and limitations of the advanced machining techniques for new materials is essential if designers and engineers are to ex-ploit fully their properties. Electrical Discharge Machining vs. Other Machining Processes “There’s more than one way to skin a cat,” as the old expression goes. ABSTRACT Metal removal mechanism in electrical discharge machine is mainly a thermal phenomenon in which thermal energy is produced with the help of electrical pulses and is dissipated through workpiece, tool and dielectric fluid. d) 50 % Artificial Neural Network Prediction of Material Removal Rate in Electro Discharge Machining Deepak Kumar Panda Institute of Technology Management , Defence R&D Organisation, Ministry of Defence, Govt. - These two electrodes (the tool as cathode and the workpiece as anode) are separated by dielectric medium. This is a manufacturing operation in which we used to make desired shapes by using an electrical spark. b) 0.01 – 0.5 mm d) 1 – 15 mm View Answer, 7. 2 Sometimes it is referred to as spark machining, spark eroding, burning, die sinking or wire erosion Its a manufacturing process whereby a desired shape is obtained using electrical discharges (sparks). How does tool wear occur in the EDM? c) 8 µm c) Electrical dimensioning Machining a) True b) Complex “In EDM, process is affected by hardness of material.” - In Electro-Chemical Machining (ECM) process, the metal removal is carried out by electrosysis This contains 10 Multiple Choice Questions for Mechanical Engineering Unconventional Machining Process - 1 (mcq) to study with solutions a complete question bank. c) Thirty d) Occasionally After invention of EDM, surface finish have improved by how much factor? Intense heat is generated by means of electric sparks. The metal removal takes place due to erosion ii. The material removal rate represents the average volume of material removed over the machining time and there follows the expression for material removal rate: e o e w e V e e t t t V V f C U I (2) On the other hand, the material removal in a single pulse discharge … metal. In electro discharge machining (EDM), if the thermal conductivity of tool is high and the specific heat of work piece is low, then the tool wear rate and material removal rate are expected to be respectively (a) high and high (b) low and low (c) high and low (d) low and high a) 0.001 – 0.05 mm What are the values of pressure of the plasma in EDM? The high frequency discharges cause melting and vaporization of material on the surface of both electrodes. State whether the following statement is true or false regarding EDM. b) Twenty a) 2000 to 3000ᵒC UCM MCQ 1. Electrochemical machining (ECM) is a method of removing metal by an electrochemical process. iii. This thesis deals with the machinability of some advanced materials by a non-conventional material-removal process, electro-discharge machining method (EDM). About thousands of sparks are generated per second and each spark melts and vaporizes very small amounts of material and produces a minuscule crater. Participate in the Sanfoundry Certification contest to get free Certificate of Merit. View Answer, 6. a) 0.001 – 1 µs Thus to summarise, the material removal in EDM mainly occurs due to formation of shock waves as the plasma channel collapse owing to discontinuation of applied potential difference. ... How is material removed in Electro discharge machining? b) 0.1 – 2000 µs State whether the following statement is true or false about material removal in EDM. d) Electrode dimensions Manufacturing b) False a) Electro discharge Machining a. View Answer, 2. b) False a) 1 to 20 V b) 20 to 120 V c) 120 to 220 V d) 220 to 320 V 3. c) Thin walls & Fine features Machining speeds have gone up to how many times after the invention of EDM? Electrical Discharge Machining is a vital manufacturing process in tool manufacturing. What are the magnitude of voltages used in Electro discharge machining? c) 20 To practice all areas of Advanced Machining, here is complete set of 1000+ Multiple Choice Questions and Answers. View Answer, 4. Similarly, there’s typically more than one way to cut parts. Join our social networks below and stay updated with latest contests, videos, internships and jobs! c) 8000 to 12000ᵒC The material in EDM is removed by erosion process with repetitive spark discharges produced by pulsating DC power supply. Sanfoundry Global Education & Learning Series – Advanced Machining. c) Periodically c) 1960s Electrical Discharge Machining Used on hard metals works with electrically conductive materials HISTORY OF EDM In1770s, discovered by Joseph Priestly. View Answer, 8. b) Up to 20 atm In this work, it was found that the stress waves released from the material during micro-electrical discharge-machining process indicate material removal by mechanical deformation and fracture mechanism. “In EDM, high pressures allow the metal to evaporate.” This set of Advanced Machining Processes Multiple Choice Questions & Answers (MCQs) focuses on “EDM-Mechanism of Material Removal – 1”. Its use is limited to electrically conductive materials. c) Mechanical erosion takes place i. a) 4 µm c) 5 kHz - In Electrical Discharge Machining (EDM) process, the metal removal is carried out by melting and vaporization as there is a controlled erosion between two electrically conducting materials, the tool and the workpiece. 6. d) 100 – 2000 ms c) 1024 W/m2 d) None of the mentioned What is the value of order of frequency applied between the two electrodes in EDM? EDM is a non-mechanical thermal shaping process with which material is removed by spatially and temporally separated electrical discharges between a workpiece electrode and a tool electrode. Electrical Discharge machining is the process of metal removal from the work surface due to an erosion of metal caused by electric spark discharge between the two electrodes tool (cathode) and the work (Anode). a) 1 kHz b) False Wire electrical discharge machining (WEDM) technology has been widely used in production, aerospace/aircraft, medical and virtually all areas of conductive material machining. View Answer, 3. What does an EDM machine do? © 2011-2020 Sanfoundry. a) Melt and evaporate Join our social networks below and stay updated with latest contests, videos, internships and jobs! b) Magnetic abrasion Partial removal of the tool material form the tool surface while machining the workpiece due to the discharge spark produced between the tool and the workpiece. b) 3 kHz a) Up to 2 atm c) 120 to 220 V 1. d) Up to 2000 atm One of the electrodes is called the tool-electrode, or simply the tool or electrode, while the other is … It usually invovles sophisticated tools and equipment, but not here! here is complete set of 1000+ Multiple Choice Questions and Answers, Prev - Advanced Machining Questions and Answers – Electro Discharge Machining-Introduction, Next - Advanced Machining Questions and Answers – EDM-Mechanism of Material Removal – 2, Machine Design Questions and Answers – Chain Drives, Advanced Machining Questions and Answers – EDM-Mechanism of Material Removal – 2, Manufacturing Engineering / Processes I Questions and Answers, Manufacturing Engineering / Processes II Questions and Answers, Machine Tools & Machining Questions and Answers, Advanced Machining Processes Questions and Answers, Advanced Machining Questions and Answers – ECG-Accuracy, Applications, Advantages and disadvantages, Advanced Machining Questions and Answers – EDM-Applications – 1, Advanced Machining Questions and Answers – Electro Discharge Machining-Introduction, Advanced Machining Questions and Answers – EDM-Applications – 2, Advanced Machining Questions and Answers – EDM-Surface Integrity, Advanced Machining Questions and Answers – EDM-Machining System – 1, Advanced Machining Questions and Answers – EDM-Heat Affected Zone (HAZ), Advanced Machining Questions and Answers – EDM-Applications – 3, Advanced Machining Questions and Answers – USM – Material Removal, Advanced Machining Questions and Answers – AJM – Material Removal Rate and Process parameters, Advanced Machining Questions and Answers – WJM – Process Parameters and Material removal, Advanced Machining Questions and Answers – LBM-Material Removal, Advanced Machining Questions and Answers – CHM – Process Parameters and Material removal, Advanced Machining Questions and Answers – Ion Beam Machining-Introduction, Material Removal Rate, Advanced Machining Questions and Answers – Electrochemical Buffing-Introduction, Material Removal, Advanced Machining Questions and Answers – Electrochemical Superfinishing-Introduction, Material Removal, Process accuracy. Due to the sparking action, the intense heat generated near the zone melts and evaporates the materials in the sparking zone. By using EDM, how much percentage of machining costs can be reduced? Some light oil like transformer oil or kerosene oil is used as dielectric. b) Fine features c) Up to 200 atm View Answer, 12. a) Thin walls View Answer. The volume of the material removed per spark discharge is typically in the range of 10 -6 to 10 What are the values of gaps between the electrodes in EDM? d) 10 µm a) 1940s a) 10 % d) No burr Compared with conventional machining—from basic CNC turning all the way up to 5-axis—EDM has certain advantages and disadvantages. material. Electric discharge machining is a controlled metal removal process that is used to remove metal by means of electric spark erosion. View Answer. To practice all areas of Advanced Machining, here is complete set of 1000+ Multiple Choice Questions and Answers . - In the electrical discharge machining process, controlled erosion is carried out between the tool and the workpiece. View Answer, 7. - The tool acts as cathode and whereas the workpiece acts as anode, in this erosion process. View Answer, 9. process to meet these demands. d) 7 kHz c) 0.2 – 100 ms What is the duration of sparks that are produced in Electro discharge machining? b) 6 µm Any electrical conductor can be machined by this method. c) 30 % b) 1950s Watch this video for a guide to making a small electrical discharge machining machine with an old electric doorbell. a) Simple Cavities with, which of the following factors can be produced using Electro discharge machining? It is also known as spark erosion , electro-erosion or spark machining. Only i b. i &ii c. i,ii & iii d. ii & iii (Ans:c) 2. c) 0.1 – 5 mm View Answer, 5. All Rights Reserved. “In EDM, negative ions (electrons) collide with positive ions to generate heat.” d) Fifty d) 15000 to 20000ᵒC © 2011-2020 Sanfoundry. d) 220 to 320 V View Answer, 10. 1. Electrical discharge machining (EDM) is one of the most extensively used non-conventional material removal processes. State whether the following statement is true or false regarding EDM. The solved questions answers in this Unconventional Machining Process - 1 quiz give you a good mix of easy questions and tough questions. In advanced machining processes, what is the full form of EDM? a) 10 % a) 1 to 20 V c) 70 % To practice all areas of Advanced Machining, here is complete set of 1000+ Multiple Choice Questions and Answers. b) 1019 W/m2 Which the following is true for Electrical Discharge machining (EDM)? 1 Electrical Discharge Machining (EDM) GOPINATH.G MECHANICAL 2. Aerospace materials are known as unique materials ever produced in … It is normally used for mass production and is used for working extremely hard materials or materials that are difficult to machine using conventional methods. d) All of the mentioned View Answer, 5. The first serious attempt of providing a physical explanation of the material removal during electric discharge machining is perhaps that of Van Dijck.Van Dijck presented a thermal model together with a computational simulation to explain the phenomena between the electrodes during electric discharge machining.However, as Van Dijck himself admitted in his study, … View Answer, 6. Which of the following mechanisms is used for material removal? View Answer, 11. When the potential difference between the electrode and the workpiece is sufficiently high, the dielectric breaks down and a transient spark discharges through the dielectric fluid, removing small amount of material from the workpiece surface. View Answer, 8. Mechanism of Material Removal in EDM In EDM, for a particular machining condition there are numerous phenomena involved, i.e., heat conduction and radiation, phase changes, electrical forces, bubble formation and collapse, rapid solidification etc. These stress waves were captured using the acoustic emission sensor. Electro-Discharge Machining (EDM) is one thermal energy based process where material is removed by localized melting and vaporization. Generally the workpiece is made positive and the tool negative. 1. d) 1027 W/m2 d) 1970s View Answer, 2. d) 25 How is material removed in Electro discharge machining? View Answer, 9. a) Electro discharge erosion How is material removed in Electro discharge machining? Developed in the mid 1970s In the mid 1980s, the EDM techniques were transferred to a machine tool Today,it is a viable technique that helped shape the metal working industry. a) Melt and evaporate b) Corrode and break c) Mechanical erosion takes place d) None of the mentioned 4. d) Mechanical erosion a) True b) 4000 to 6000ᵒC How much amount of burr is produced in this process? View Answer, 4. (C) Partial contact machining (D) Half contact machining MCQ No - 4 When the metal is removed by erosion caused by rapidly recurring spark discharges between the tool and work, the process is known as This contains 10 Multiple Choice Questions for Mechanical Engineering Unconventional Machining Process - 3 (mcq) to study with solutions a complete question bank. here is complete set of 1000+ Multiple Choice Questions and Answers, Prev - Advanced Machining Questions and Answers – Electrochemical Deburring – 2, Next - Advanced Machining Questions and Answers – EDM-Mechanism of Material Removal – 1, Machine Design Questions and Answers – Belt Tensioning Methods, Machine Design Questions and Answers – Chain Drives, Online Training – SAN, C, Linux Kernel & Device Drivers Training, Chemical Process Calculation Questions and Answers, Aircraft Maintenance Questions and Answers, Manufacturing Engineering / Processes I Questions and Answers, Manufacturing Engineering / Processes II Questions and Answers, Machine Tools & Machining Questions and Answers, Advanced Machining Processes Questions and Answers, Advanced Machining Questions and Answers – Ion Beam Machining-Introduction, Material Removal Rate, Advanced Machining Questions and Answers – Magnetic Abrasive Finishing – Introduction, Advanced Machining Questions and Answers – Electrochemical Buffing-Introduction, Material Removal, Manufacturing Engineering Questions & Answers – Electric Discharge Machining, Advanced Machining Questions and Answers – Non Traditional Machining, Advanced Machining Questions and Answers – Plasma Beam Machining-Introduction And Machining system, Advanced Machining Questions and Answers – Water Jet Machining – Introduction and Machining system, Advanced Machining Questions and Answers – Electrochemical Grinding-Introduction, Advanced Machining Questions and Answers – Electrochemical Honning-Introduction, Advanced Machining Questions and Answers – Electronbeam Machining-Introduction, Equipment and Material removal, Advanced Machining Questions and Answers – Abrasive Jet Machining – Introduction and Machining system, Advanced Machining Questions and Answers – Photo Chemical Millling-Introduction, Advanced Machining Questions and Answers – EDM-Applications – 3. Material Removal Mechanism. Sanfoundry Global Education & Learning Series – Advanced Machining. a) 10 b) Normally b) 15 View Answer, 3. The solved questions answers in this Unconventional Machining Process - 3 quiz give you a good mix of easy questions and tough questions. What range of heat fluxes are obtained while machining using EDM? 8. d) None of the mentioned What are the magnitudes of voltages used in Electro discharge machining? Explanation: Material is removed by electro-discharge erosion (EDE) in EDM. At the end of pulse, super-heated metal evaporates _______________ Participate in the Sanfoundry Certification contest to get free Certificate of Merit. Sanfoundry Global Education & Learning Series – Advanced Machining. b) Corrode and break What are the values of temperature that are obtained while machining using EDM? a) Ten a) Explosively b) 20 % View Answer, 10. This set of Advanced Machining Processes Multiple Choice Questions & Answers (MCQs) focuses on “EDM-Mechanism of Material Removal – 1”. c) Difficult to cut Electrical discharge machining 1. Which of the following geometries can be machined using EDM? Electical discharge machining is a techinque in which electricity is used to machine (cut, grind, etc.) a) True b) 20 to 120 V c) Electro chemical dissolution Material is removed from the work piece by a series of rapidly recurring current discharges between two electrodes, separated by a dielectric liquid and subject to an electric voltage. a) Brass b) Copper c) Graphite d) All of the above. a) Melt and evaporate b) Corrode and break c) … All Rights Reserved. The evolution of wire EDM took place in which part of history? Q5.Which of the following materials is/are used for Electrical Discharge Machining (EDM) process? What is the radius of channel, when electrical breakdown occur? b) 40 % a) 1017 W/m2 It is an electro-thermal machining process where electrical energy is used to generate electrical spark and material removal mainly occurs due to thermal energy of the spark. This set of Advanced Machining Processes Multiple Choice Questions & Answers (MCQs) focuses on “Electro Discharge Machining-Introduction”. , videos, internships and jobs machining process - 3 quiz give you good! Kerosene oil is used as dielectric is/are used for material removal in EDM how..., discovered by Joseph Priestly of material. ” a ) Explosively b ) 1950s ). Electrochemical machining ( EDM ) is a vital manufacturing process in tool manufacturing true or false EDM. Tool negative ) Difficult to cut parts, discovered by Joseph Priestly 10 b ) 1950s how is material removed in electro discharge machining mcq 30! % View Answer, 6 material on the surface of both electrodes ( Ans: c Graphite... 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Of Advanced machining Processes, what is the radius of channel, when electrical breakdown occur are separated dielectric... We used to machine ( cut, grind, etc. on the of! Shapes by using EDM the machinability of some Advanced materials by a non-conventional material-removal process, controlled erosion is out. Of Merit generated by means of electric spark erosion, electro-erosion or machining. Easy Questions and tough Questions between the two electrodes in EDM is removed by localized melting vaporization! To 20000ᵒC View Answer, 3, ii & iii d. ii & iii d. ii & iii ii. How much amount of burr is produced in … material removal 1960s )! The workpiece is made positive and the workpiece acts as anode, in this process, 11 to... Khz b ) false View Answer, 11, when electrical breakdown occur ) Periodically d ) 1970s Answer! Electro-Discharge machining method ( EDM ) process, 11 ) Thirty d ) Electrode dimensions manufacturing Answer...