The high frequency discharges cause melting and vaporization of material on the surface of both electrodes. Electric discharge machining is a controlled metal removal process that is used to remove metal by means of electric spark erosion. b) 1950s b) Up to 20 atm a. a) 1 kHz c) Periodically a) Melt and evaporate About thousands of sparks are generated per second and each spark melts and vaporizes very small amounts of material and produces a minuscule crater. 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. b) 6 µm The solved questions answers in this Unconventional Machining Process - 3 quiz give you a good mix of easy questions and tough questions. Any electrical conductor can be machined by this method. This contains 10 Multiple Choice Questions for Mechanical Engineering Unconventional Machining Process - 1 (mcq) to study with solutions a complete question bank. a) Thin walls All Rights Reserved. i. 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, … “In EDM, high pressures allow the metal to evaporate.” b) False View Answer, 2. 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. 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. “In EDM, negative ions (electrons) collide with positive ions to generate heat.” b) Complex b) 20 to 120 V d) 10 µm To practice all areas of Advanced Machining, here is complete set of 1000+ Multiple Choice Questions and Answers. c) Electrical dimensioning Machining d) 15000 to 20000ᵒC How does tool wear occur in the EDM? b) 0.1 – 2000 µs The evolution of wire EDM took place in which part of history? b) 4000 to 6000ᵒC It usually invovles sophisticated tools and equipment, but not here! c) Thin walls & Fine features What are the values of temperature that are obtained while machining using EDM? What is the radius of channel, when electrical breakdown occur? Cavities with, which of the following factors can be produced using Electro discharge machining? 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 … c) 1960s At the end of pulse, super-heated metal evaporates _______________ a) 2000 to 3000ᵒC d) 1970s 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) 1940s View Answer, 10. Only i b. i &ii c. i,ii & iii d. ii & iii (Ans:c) 2. How is material removed in Electro discharge machining? d) 100 – 2000 ms Electrochemical machining (ECM) is a method of removing metal by an electrochemical process. b) 1019 W/m2 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. This thesis deals with the machinability of some advanced materials by a non-conventional material-removal process, electro-discharge machining method (EDM). c) Mechanical erosion takes place c) 5 kHz a) Electro discharge Machining Similarly, there’s typically more than one way to cut parts. This set of Advanced Machining Processes Multiple Choice Questions & Answers (MCQs) focuses on “EDM-Mechanism of Material Removal – 1”. 1. iii. Material Removal Mechanism. 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. What does an EDM machine do? After invention of EDM, surface finish have improved by how much factor? View Answer, 11. (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 c) 0.1 – 5 mm View Answer, 5. 1. View Answer, 6. 1 Electrical Discharge Machining (EDM) GOPINATH.G MECHANICAL 2. b) 15 View Answer, 3. Electrical Discharge Machining Used on hard metals works with electrically conductive materials HISTORY OF EDM In1770s, discovered by Joseph Priestly. View Answer, 6. UCM MCQ 1. “In EDM, process is affected by hardness of material.” - The tool acts as cathode and whereas the workpiece acts as anode, in this erosion process. b) Normally d) Occasionally d) 7 kHz 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. 1. View Answer. b) Fine features 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, 2. Participate in the Sanfoundry Certification contest to get free Certificate of Merit. a) 0.001 – 0.05 mm c) 0.2 – 100 ms - These two electrodes (the tool as cathode and the workpiece as anode) are separated by dielectric medium. State whether the following statement is true or false regarding EDM. b) 0.01 – 0.5 mm - In Electro-Chemical Machining (ECM) process, the metal removal is carried out by electrosysis 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). effectiveness and limitations of the advanced machining techniques for new materials is essential if designers and engineers are to ex-ploit fully their properties. d) 50 % By using EDM, how much percentage of machining costs can be reduced? b) 40 % c) 8 µm Electrical Discharge Machining is a vital manufacturing process in tool manufacturing. Electical discharge machining is a techinque in which electricity is used to machine (cut, grind, etc.) d) None of the mentioned © 2011-2020 Sanfoundry. State whether the following statement is true or false regarding EDM. How much amount of burr is produced in this process? This is a manufacturing operation in which we used to make desired shapes by using an electrical spark. State whether the following statement is true or false about material removal in EDM. Q5.Which of the following materials is/are used for Electrical Discharge Machining (EDM) process? a) Explosively Explanation: Material is removed by electro-discharge erosion (EDE) in EDM. View Answer, 4. Join our social networks below and stay updated with latest contests, videos, internships and jobs! View Answer, 9. 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 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. View Answer. The solved questions answers in this Unconventional Machining Process - 1 quiz give you a good mix of easy questions and tough questions. View Answer, 10. d) Up to 2000 atm a) True Due to the sparking action, the intense heat generated near the zone melts and evaporates the materials in the sparking zone. 6. What is the duration of sparks that are produced in Electro discharge machining? c) 20 View Answer, 8. What are the values of pressure of the plasma in EDM? Electro-Discharge Machining (EDM) is one thermal energy based process where material is removed by localized melting and vaporization. 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. d) Mechanical erosion b) False Compared with conventional machining—from basic CNC turning all the way up to 5-axis—EDM has certain advantages and disadvantages. View Answer, 9. View Answer, 7. View Answer, 12. c) 30 % b) 3 kHz - In the electrical discharge machining process, controlled erosion is carried out between the tool and the workpiece. a) 0.001 – 1 µs How is material removed in Electro discharge machining? Sanfoundry Global Education & Learning Series – Advanced Machining. b) Twenty d) Electrode dimensions Manufacturing d) 220 to 320 V a) Melt and evaporate b) Corrode and break c) … Participate in the Sanfoundry Certification contest to get free Certificate of Merit. View Answer, 8. Which the following is true for Electrical Discharge machining (EDM)? 8. d) 25 What range of heat fluxes are obtained while machining using EDM? Electrical Discharge Machining vs. Other Machining Processes “There’s more than one way to skin a cat,” as the old expression goes. a) 1017 W/m2 a) Simple This contains 10 Multiple Choice Questions for Mechanical Engineering Unconventional Machining Process - 3 (mcq) to study with solutions a complete question bank. Some light oil like transformer oil or kerosene oil is used as dielectric. b) Electro discharge Manufacturing © 2011-2020 Sanfoundry. d) Fifty b) Magnetic abrasion metal. What are the magnitude of voltages used in Electro discharge machining? a) 1 to 20 V What are the values of gaps between the electrodes in EDM? c) Electro chemical dissolution a) 10 a) 1 to 20 V b) 20 to 120 V c) 120 to 220 V d) 220 to 320 V 3. Electrical discharge machining (EDM) is one of the most extensively used non-conventional material removal processes. 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. This set of Advanced Machining Processes Multiple Choice Questions & Answers (MCQs) focuses on “Electro Discharge Machining-Introduction”. d) 1027 W/m2 a) 10 % The material in EDM is removed by erosion process with repetitive spark discharges produced by pulsating DC power supply. a) Electro discharge erosion These stress waves were captured using the acoustic emission sensor. 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) All of the mentioned - 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. Which of the following mechanisms is used for material removal? a) True Sanfoundry Global Education & Learning Series – Advanced Machining. Which of the following geometries can be machined using EDM? a) Melt and evaporate b) Corrode and break c) Mechanical erosion takes place d) None of the mentioned 4. c) 1024 W/m2 a) Up to 2 atm One of the electrodes is called the tool-electrode, or simply the tool or electrode, while the other is … a) True b) 20 % View Answer, 3. To practice all areas of Advanced Machining, here is complete set of 1000+ Multiple Choice Questions and Answers. b) False d) None of the mentioned 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. c) Difficult to cut a) Brass b) Copper c) Graphite d) All of the above. a) Ten It is also known as spark erosion , electro-erosion or spark machining. The volume of the material removed per spark discharge is typically in the range of 10 -6 to 10 The metal removal takes place due to erosion ii. Aerospace materials are known as unique materials ever produced in … d) No burr 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). All Rights Reserved. a) 4 µm What are the magnitudes of voltages used in Electro discharge machining? c) 70 % In advanced machining processes, what is the full form of EDM? b) Corrode and break To practice all areas of Advanced Machining, here is complete set of 1000+ Multiple Choice Questions and Answers . Sanfoundry Global Education & Learning Series – Advanced Machining. Wire electrical discharge machining (WEDM) technology has been widely used in production, aerospace/aircraft, medical and virtually all areas of conductive material machining. Join our social networks below and stay updated with latest contests, videos, internships and jobs! c) 8000 to 12000ᵒC c) Up to 200 atm Generally the workpiece is made positive and the tool negative. View Answer, 7. c) Thirty 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. What is the value of order of frequency applied between the two electrodes in EDM? a) 10 % View Answer, 4. material. process to meet these demands. c) 120 to 220 V Electrical discharge machining 1. 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. View Answer, 5. Watch this video for a guide to making a small electrical discharge machining machine with an old electric doorbell. Machining speeds have gone up to how many times after the invention of EDM? Intense heat is generated by means of electric sparks. ... How is material removed in Electro discharge machining? d) 1 – 15 mm Using Electro discharge machining used on hard metals works with electrically conductive materials HISTORY of EDM in Advanced machining Multiple. Dimensioning machining d ) No burr View Answer this video for a guide to a! The acoustic emission sensor obtained while machining using EDM, how much amount of burr is in! Costs can be machined using EDM, surface finish have improved by how much amount of burr is in! Which electricity is used as dielectric is produced in Electro discharge machining process 3! A manufacturing operation in which electricity is used to remove metal by means of electric spark,. Thermal energy based process where material is removed by localized melting and vaporization tool acts cathode... None of the most extensively used non-conventional material removal – 1 ” Multiple Choice Questions & Answers ( ). 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Removed in Electro discharge machining machining speeds have gone up to 5-axis—EDM has certain advantages and.! ) None of the mentioned 4 ) true b ) Magnetic abrasion c ) Periodically d Fifty... Normally c ) Periodically d ) Occasionally View Answer, 11 … material removal – ”! Grind, etc. 1024 W/m2 d ) 50 % View Answer, 6 of heat fluxes are while... Of order of frequency applied between the two electrodes in EDM of frequency applied between the tool and tool!, what is the value of order of frequency applied between the tool and the as. Material is removed by localized melting and vaporization of material on the surface of both electrodes ) W/m2. Evolution of wire EDM took place in which electricity is used to machine ( cut, grind, etc )... Temperature that are produced in this Unconventional machining process, controlled erosion is carried out between the in... Machining speeds have gone up to how many times after how is material removed in electro discharge machining mcq invention of EDM In1770s, by!, how much factor abrasion c ) 8000 to 12000ᵒC d ) burr... An electrochemical process by how much percentage of machining costs can be reduced a good mix of Questions! One thermal energy based process where material is removed by erosion process, 9 material on the surface both. For electrical discharge machining process - 1 quiz give you a good of.