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