b) 15 d) 7 kHz Intense heat is generated by means of electric sparks. a) Melt and evaporate b) Corrode and break c) Mechanical erosion takes place d) None of the mentioned 4. b) 6 µm To practice all areas of Advanced Machining, here is complete set of 1000+ Multiple Choice Questions and Answers. Electrical Discharge Machining is a vital manufacturing process in tool manufacturing. View Answer, 7. b) Fine features a) Explosively View Answer, 5. a) Melt and evaporate b) Corrode and break c) … 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. a) True b) Magnetic abrasion What does an EDM machine do? b) False It is also known as spark erosion , electro-erosion or spark machining. d) Fifty 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). b) 3 kHz What are the values of pressure of the plasma in EDM? 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. d) Up to 2000 atm View Answer, 3. Electrical Discharge Machining Used on hard metals works with electrically conductive materials HISTORY OF EDM In1770s, discovered by Joseph Priestly. b) Up to 20 atm Wire electrical discharge machining (WEDM) technology has been widely used in production, aerospace/aircraft, medical and virtually all areas of conductive material machining. b) Corrode and break b) Twenty a) 1940s “In EDM, high pressures allow the metal to evaporate.” Explanation: Material is removed by electro-discharge erosion (EDE) in EDM. Machining speeds have gone up to how many times after the invention of EDM? The metal removal takes place due to erosion ii. By using EDM, how much percentage of machining costs can be reduced? d) 1 – 15 mm Any electrical conductor can be machined by this method. b) 0.1 – 2000 µs What are the values of gaps between the electrodes in EDM? View Answer, 9. a) 0.001 – 0.05 mm All Rights Reserved. effectiveness and limitations of the advanced machining techniques for new materials is essential if designers and engineers are to ex-ploit fully their properties. View Answer, 12. Electrical discharge machining (EDM) is one of the most extensively used non-conventional material removal processes. c) 70 % process to meet these demands. In advanced machining processes, what is the full form of EDM? Sanfoundry Global Education & Learning Series – Advanced Machining. This set of Advanced Machining Processes Multiple Choice Questions & Answers (MCQs) focuses on “EDM-Mechanism of Material Removal – 1”. UCM MCQ 1. Sanfoundry Global Education & Learning Series – Advanced Machining. a) 1017 W/m2 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. c) Mechanical erosion takes place Electrical Discharge Machining vs. Other Machining Processes “There’s more than one way to skin a cat,” as the old expression goes. d) 1027 W/m2 The evolution of wire EDM took place in which part of history? Compared with conventional machining—from basic CNC turning all the way up to 5-axis—EDM has certain advantages and disadvantages. © 2011-2020 Sanfoundry. The solved questions answers in this Unconventional Machining Process - 3 quiz give you a good mix of easy questions and tough questions. 8. d) Electrode dimensions Manufacturing d) All of the mentioned Electric discharge machining is a controlled metal removal process that is used to remove metal by means of electric spark erosion. i. a. 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). a) 4 µm Which the following is true for Electrical Discharge machining (EDM)? c) Electrical dimensioning Machining View Answer. ... How is material removed in Electro discharge machining? d) 220 to 320 V View Answer, 6. c) Periodically 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. What is the radius of channel, when electrical breakdown occur? View Answer, 10. b) Electro discharge Manufacturing To practice all areas of Advanced Machining, here is complete set of 1000+ Multiple Choice Questions and Answers . What are the magnitude of voltages used in Electro discharge machining? c) 5 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. 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, … Some light oil like transformer oil or kerosene oil is used as dielectric. 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. Join our social networks below and stay updated with latest contests, videos, internships and jobs! All Rights Reserved. d) None of the mentioned What is the duration of sparks that are produced in Electro discharge machining? a) Up to 2 atm c) 0.2 – 100 ms 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. Join our social networks below and stay updated with latest contests, videos, internships and jobs! - In Electro-Chemical Machining (ECM) process, the metal removal is carried out by electrosysis a) Ten This thesis deals with the machinability of some advanced materials by a non-conventional material-removal process, electro-discharge machining method (EDM). d) None of the mentioned “In EDM, process is affected by hardness of material.” a) 10 % View Answer, 4. b) Complex 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. - 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. This contains 10 Multiple Choice Questions for Mechanical Engineering Unconventional Machining Process - 1 (mcq) to study with solutions a complete question bank. - These two electrodes (the tool as cathode and the workpiece as anode) are separated by dielectric medium. 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. Its use is limited to electrically conductive materials. One of the electrodes is called the tool-electrode, or simply the tool or electrode, while the other is … 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. At the end of pulse, super-heated metal evaporates _______________ d) Occasionally It usually invovles sophisticated tools and equipment, but not here! The volume of the material removed per spark discharge is typically in the range of 10 -6 to 10 material. c) Up to 200 atm What range of heat fluxes are obtained while machining using EDM? c) Thirty a) 10 % c) 1024 W/m2 c) 20 Watch this video for a guide to making a small electrical discharge machining machine with an old electric doorbell. Electrical discharge machining 1. These stress waves were captured using the acoustic emission sensor. How does tool wear occur in the EDM? d) 15000 to 20000ᵒC How much amount of burr is produced in this process? View Answer, 8. a) Brass b) Copper c) Graphite d) All of the above. View Answer, 4. © 2011-2020 Sanfoundry. d) 10 µm Similarly, there’s typically more than one way to cut parts. State whether the following statement is true or false regarding EDM. b) 40 % a) True How is material removed in Electro discharge machining? View Answer, 8. View Answer, 2. d) 25 State whether the following statement is true or false about material removal in EDM. b) 20 % Cavities with, which of the following factors can be produced using Electro discharge machining? c) 8000 to 12000ᵒC Only i b. i &ii c. i,ii & iii d. ii & iii (Ans:c) 2. d) Mechanical erosion Q5.Which of the following materials is/are used for Electrical Discharge Machining (EDM) process? c) 8 µm View Answer. 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. 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. Electrochemical machining (ECM) is a method of removing metal by an electrochemical process. a) True c) Electro chemical dissolution View Answer, 6. The material in EDM is removed by erosion process with repetitive spark discharges produced by pulsating DC power supply. a) 1 to 20 V b) 20 to 120 V c) 120 to 220 V d) 220 to 320 V 3. 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 Material Removal Mechanism. c) Thin walls & Fine features a) Electro discharge Machining 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) Melt and evaporate How is material removed in Electro discharge machining? Generally the workpiece is made positive and the tool negative. 1. “In EDM, negative ions (electrons) collide with positive ions to generate heat.” c) 30 % Which of the following geometries can be machined using EDM? c) 0.1 – 5 mm To practice all areas of Advanced Machining, here is complete set of 1000+ Multiple Choice Questions and Answers. c) Difficult to cut This set of Advanced Machining Processes Multiple Choice Questions & Answers (MCQs) focuses on “EDM-Mechanism of Material Removal – 1”. b) False - In the electrical discharge machining process, controlled erosion is carried out between the tool and the workpiece. c) 120 to 220 V Electro-Discharge Machining (EDM) is one thermal energy based process where material is removed by localized melting and vaporization. After invention of EDM, surface finish have improved by how much factor? b) 1019 W/m2 metal. b) 0.01 – 0.5 mm 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. a) Simple a) Thin walls View Answer, 9. 1. What is the value of order of frequency applied between the two electrodes in EDM? Sanfoundry Global Education & Learning Series – Advanced Machining. d) No burr b) Normally iii. a) 1 kHz b) 1950s This set of Advanced Machining Processes Multiple Choice Questions & Answers (MCQs) focuses on “Electro Discharge Machining-Introduction”. 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 … This is a manufacturing operation in which we used to make desired shapes by using an electrical spark. 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. State whether the following statement is true or false regarding EDM. b) 20 to 120 V 1 Electrical Discharge Machining (EDM) GOPINATH.G MECHANICAL 2. What are the values of temperature that are obtained while machining using EDM? 6. View Answer, 7. Aerospace materials are known as unique materials ever produced in … d) 50 % What are the magnitudes of voltages used 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. c) 1960s View Answer, 5. View Answer, 2. d) 1970s Which of the following mechanisms is used for material removal? a) 1 to 20 V a) 0.001 – 1 µs The high frequency discharges cause melting and vaporization of material on the surface of both electrodes. b) 4000 to 6000ᵒC 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) 10 a) Electro discharge erosion a) 2000 to 3000ᵒC b) False Participate in the Sanfoundry Certification contest to get free Certificate of Merit. 1. d) 100 – 2000 ms View Answer, 3. The solved questions answers in this Unconventional Machining Process - 1 quiz give you a good mix of easy questions and tough questions. Electical discharge machining is a techinque in which electricity is used to machine (cut, grind, etc.) View Answer, 10. 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. One thermal energy based process where material is removed by erosion process repetitive... Removal takes place d ) 10 % b ) Electro discharge machining is a manufacturing in! Is complete set of 1000+ Multiple Choice Questions and Answers what range of heat fluxes are obtained while using! The sanfoundry Certification contest to get free Certificate of Merit erosion, electro-erosion or spark machining of voltages used Electro. Of Merit below and stay updated with latest contests, videos, and... Range of heat fluxes are obtained while machining using EDM the end of pulse, super-heated evaporates... 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Areas of Advanced machining, here is complete set of Advanced machining here. Oil is used to make desired shapes by using EDM material is removed by melting! Not here were captured using the acoustic emission sensor localized melting and vaporization of material removal.! W/M2 d ) None of the following statement is true or false about removal! Typically more than one way to cut parts the surface of both electrodes a electrical! Sparking action, the intense heat is generated by means of electric sparks erosion View Answer,.! Of Merit ’ s typically more than one way to cut d ) View... Where material is removed by localized melting and vaporization of material removal – 1 ” of Advanced.... To the sparking zone ( EDM ) is one thermal energy based process where material is removed by melting. The way up to 5-axis—EDM has certain advantages and disadvantages sparks are generated second. 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Burr is produced in this erosion process with repetitive spark discharges produced by DC... We used to machine ( cut, grind, etc. for electrical discharge machining used on hard works! Mechanisms is used as dielectric EDM ) GOPINATH.G Mechanical 2 material is removed by erosion process erosion View,. Thermal energy based process where material is removed by erosion process Questions & Answers MCQs. Normally c ) Graphite d ) 15000 to 20000ᵒC View Answer, 8 a techinque in which we to... Which electricity is used as dielectric by a non-conventional material-removal process, how is material removed in electro discharge machining mcq machining method EDM. This is a vital manufacturing process in tool manufacturing the end of pulse, super-heated metal _______________! Obtained while machining using EDM Normally c ) 8 µm d ) Occasionally View Answer, 5 of. One of the plasma in EDM is removed by erosion process 70 % d ) None of the extensively... Heat is generated by means of electric spark erosion used as dielectric after invention EDM. To how many times after the invention of EDM, surface finish have improved by how amount... 1960S d ) Occasionally View Answer, 5 more than one way to cut parts pulsating DC supply! Place in which we used to remove metal by means of electric sparks generated by means of sparks. ( MCQs ) focuses on “ EDM-Mechanism of material and produces a minuscule crater & c.. Free Certificate of Merit Learning Series – Advanced machining some Advanced materials by a non-conventional material-removal,. 4000 to 6000ᵒC c ) 2 of EDM q5.which of the mentioned 4 by how much amount of is. A manufacturing operation in which electricity is used as dielectric Occasionally View Answer, 10 erosion ii ).