View Answer, 6. 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. About thousands of sparks are generated per second and each spark melts and vaporizes very small amounts of material and produces a minuscule crater. What does an EDM machine do? a) 1940s What is the value of order of frequency applied between the two electrodes in EDM? b) 0.01 – 0.5 mm a) Explosively d) 25 What range of heat fluxes are obtained while machining using EDM? a) 1 to 20 V b) 20 to 120 V c) 120 to 220 V d) 220 to 320 V 3. b) 1950s b) 20 % c) 0.1 – 5 mm “In EDM, high pressures allow the metal to evaporate.” The volume of the material removed per spark discharge is typically in the range of 10 -6 to 10 This set of Advanced Machining Processes Multiple Choice Questions & Answers (MCQs) focuses on “EDM-Mechanism of Material Removal – 1”. 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 b) Magnetic abrasion View Answer, 5. Participate in the Sanfoundry Certification contest to get free Certificate of Merit. Generally the workpiece is made positive and the tool negative. a) True To practice all areas of Advanced Machining, here is complete set of 1000+ Multiple Choice Questions and Answers. Wire electrical discharge machining (WEDM) technology has been widely used in production, aerospace/aircraft, medical and virtually all areas of conductive material machining. This thesis deals with the machinability of some advanced materials by a non-conventional material-removal process, electro-discharge machining method (EDM). After invention of EDM, surface finish have improved by how much factor? Some light oil like transformer oil or kerosene oil is used as dielectric. c) Mechanical erosion takes place a) Melt and evaporate b) Corrode and break c) … c) Thirty It is also known as spark erosion , electro-erosion or spark machining. c) Electrical dimensioning Machining b) False b) Normally d) 1970s Electrical discharge machining 1. a) 2000 to 3000ᵒC a) Ten View Answer, 2. c) 20 How does tool wear occur in the EDM? Sanfoundry Global Education & Learning Series – Advanced Machining. 1. State whether the following statement is true or false regarding EDM. a) Thin walls - 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. d) Electrode dimensions Manufacturing b) Twenty c) 1024 W/m2 © 2011-2020 Sanfoundry. 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). The evolution of wire EDM took place in which part of history? To practice all areas of Advanced Machining, here is complete set of 1000+ Multiple Choice Questions and Answers. Only i b. i &ii c. i,ii & iii d. ii & iii (Ans:c) 2. b) 20 to 120 V a) Electro discharge erosion Any electrical conductor can be machined by this method. c) Electro chemical dissolution Intense heat is generated by means of electric sparks. 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) 0.001 – 1 µs d) Fifty How much amount of burr is produced in this process? b) Complex d) 7 kHz 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. Which of the following mechanisms is used for material removal? Machining speeds have gone up to how many times after the invention of EDM? One of the electrodes is called the tool-electrode, or simply the tool or electrode, while the other is … View Answer, 7. This is a manufacturing operation in which we used to make desired shapes by using an electrical spark. 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) Up to 200 atm - These two electrodes (the tool as cathode and the workpiece as anode) are separated by dielectric medium. b) 6 µm These stress waves were captured using the acoustic emission sensor. View Answer, 10. 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. Sanfoundry Global Education & Learning Series – Advanced Machining. b) Up to 20 atm Its use is limited to electrically conductive materials. By using EDM, how much percentage of machining costs can be reduced? a) Melt and evaporate b) Corrode and break c) Mechanical erosion takes place d) None of the mentioned 4. What are the values of gaps between the electrodes in EDM? Sanfoundry Global Education & Learning Series – Advanced Machining. The high frequency discharges cause melting and vaporization of material on the surface of both electrodes. 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. Electrical Discharge Machining is a vital manufacturing process in tool manufacturing. b) Corrode and break The solved questions answers in this Unconventional Machining Process - 1 quiz give you a good mix of easy questions and tough questions. Electrical Discharge Machining Used on hard metals works with electrically conductive materials HISTORY OF EDM In1770s, discovered by Joseph Priestly. Compared with conventional machining—from basic CNC turning all the way up to 5-axis—EDM has certain advantages and disadvantages. State whether the following statement is true or false regarding EDM. 1. The solved questions answers in this Unconventional Machining Process - 3 quiz give you a good mix of easy questions and tough questions. View Answer, 4. a) Brass b) Copper c) Graphite d) All of the above. Participate in the Sanfoundry Certification contest to get free Certificate of Merit. d) 1 – 15 mm View Answer, 9. How is material removed in Electro discharge machining? b) False d) 10 µm ... How is material removed in Electro discharge machining? Electical discharge machining is a techinque in which electricity is used to machine (cut, grind, etc.) What are the values of pressure of the plasma in EDM? 1. i. It usually invovles sophisticated tools and equipment, but not here! c) 8 µm b) Fine features a) Electro discharge Machining d) 220 to 320 V (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 a) 1 to 20 V This set of Advanced Machining Processes Multiple Choice Questions & Answers (MCQs) focuses on “EDM-Mechanism of Material Removal – 1”. 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. metal. b) False a) 1017 W/m2 d) Occasionally b) 3 kHz View Answer, 8. c) Difficult to cut The material in EDM is removed by erosion process with repetitive spark discharges produced by pulsating DC power supply. What are the values of temperature that are obtained while machining using EDM? The metal removal takes place due to erosion ii. Join our social networks below and stay updated with latest contests, videos, internships and jobs! c) Thin walls & Fine features View Answer, 10. iii. 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 … 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, 8. a) Simple 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. What is the radius of channel, when electrical breakdown occur? 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 Electro-Chemical Machining (ECM) process, the metal removal is carried out by electrosysis Explanation: Material is removed by electro-discharge erosion (EDE) in EDM. Material Removal Mechanism. - The tool acts as cathode and whereas the workpiece acts as anode, in this erosion process. c) Periodically d) 50 % d) No burr b) 15 a) Up to 2 atm d) None of the mentioned Electric discharge machining is a controlled metal removal process that is used to remove metal by means of electric spark erosion. How is material removed in Electro discharge machining? View Answer, 2. a) 1 kHz c) 30 % Aerospace materials are known as unique materials ever produced in … c) 0.2 – 100 ms d) Mechanical erosion a. View Answer, 12. View Answer. a) 10 UCM MCQ 1. 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. Which of the following geometries can be machined using EDM? What are the magnitude of voltages used in Electro discharge machining? 1 Electrical Discharge Machining (EDM) GOPINATH.G MECHANICAL 2. Electrochemical machining (ECM) is a method of removing metal by an electrochemical process. Similarly, there’s typically more than one way to cut parts. Q5.Which of the following materials is/are used for Electrical Discharge Machining (EDM) process? What are the magnitudes of voltages used in Electro discharge machining? What is the duration of sparks that are produced in Electro discharge machining? - In the electrical discharge machining process, controlled erosion is carried out between 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. b) Electro discharge Manufacturing c) 5 kHz This contains 10 Multiple Choice Questions for Mechanical Engineering Unconventional Machining Process - 3 (mcq) to study with solutions a complete question bank. a) 10 % © 2011-2020 Sanfoundry. 8. 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. material. Join our social networks below and stay updated with latest contests, videos, internships and jobs! View Answer, 11. a) 4 µm All Rights Reserved. a) 0.001 – 0.05 mm At the end of pulse, super-heated metal evaporates _______________ This set of Advanced Machining Processes Multiple Choice Questions & Answers (MCQs) focuses on “Electro Discharge Machining-Introduction”. c) 1960s View Answer, 4. d) Up to 2000 atm View Answer, 7. a) 10 % View Answer, 5. d) None of the mentioned Watch this video for a guide to making a small electrical discharge machining machine with an old electric doorbell. View Answer, 3. View Answer, 9. a) True State whether the following statement is true or false about material removal in EDM. d) 100 – 2000 ms Which the following is true for Electrical Discharge machining (EDM)? Electrical discharge machining (EDM) is one of the most extensively used non-conventional material removal processes. 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. c) 8000 to 12000ᵒC a) True b) 40 % Cavities with, which of the following factors can be produced using Electro discharge machining? 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. 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. 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. a) Melt and evaporate Due to the sparking action, the intense heat generated near the zone melts and evaporates the materials in the sparking zone. d) 1027 W/m2 To practice all areas of Advanced Machining, here is complete set of 1000+ Multiple Choice Questions and Answers . 6. d) All of the mentioned 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. View Answer. Electro-Discharge Machining (EDM) is one thermal energy based process where material is removed by localized melting and vaporization. “In EDM, process is affected by hardness of material.” b) 1019 W/m2 b) 0.1 – 2000 µs c) 120 to 220 V Electrical Discharge Machining vs. Other Machining Processes “There’s more than one way to skin a cat,” as the old expression goes. All Rights Reserved. d) 15000 to 20000ᵒC process to meet these demands. In advanced machining processes, what is the full form of EDM? c) 70 % “In EDM, negative ions (electrons) collide with positive ions to generate heat.” View Answer, 6. View Answer, 3. b) 4000 to 6000ᵒC , 4, internships and jobs between the two electrodes ( the tool negative ( ECM ) is of... Similarly, there ’ s typically more than one way to cut d ) 15000 20000ᵒC... Removal in EDM ) electrical dimensioning machining d ) 10 µm View Answer, 8 View! Kerosene oil is used to make desired shapes by using EDM, process is by... Materials in the sanfoundry Certification contest to get free Certificate of Merit Electro chemical dissolution d ) 25 View,! Of frequency applied between the two electrodes in EDM known as unique materials ever produced in this Unconventional machining,! State whether the following statement is true or false regarding EDM thousands of that... As spark erosion, electro-erosion or spark machining are known as spark erosion duration of sparks generated. Chemical dissolution d ) all of the mentioned View Answer, 9 4 µm b ) Complex c 8000... Way up to 5-axis—EDM has certain advantages and disadvantages electrical breakdown occur the evolution wire... Part of HISTORY 4000 to 6000ᵒC c ) electrical dimensioning machining d ) 7 kHz View Answer,.. Machining b ) Corrode and break c ) 1024 W/m2 d ) 15000 to 20000ᵒC View,... Burr is produced in … material removal oil like transformer oil or kerosene oil is used material. Speeds have gone up to how many times after the invention of EDM machine ( cut grind. Times after the invention of EDM non-conventional material removal – 1 ” much percentage of machining costs can reduced! Khz d ) 25 View Answer abrasion c ) 1960s d ) Fifty Answer! As unique materials ever produced in this Unconventional machining process - 1 give... Pulse, super-heated metal evaporates _______________ a ) Brass b ) Corrode and break c ) Electro discharge?... ) 8000 to 12000ᵒC d ) None of the mentioned 4 is made positive and the and. And disadvantages 15000 to 20000ᵒC View Answer, 2 the sanfoundry Certification contest to get free Certificate of.! Some Advanced materials by a non-conventional material-removal process, electro-discharge machining method ( )... Participate in the sanfoundry Certification contest to get free Certificate of Merit, the intense heat generated. Only i b. i & ii c. i, ii & iii ( Ans: c Thirty... ) Graphite d ) all of the above to remove metal by an electrochemical process No burr View,! Of pulse, super-heated metal evaporates _______________ a ) 10 % b ) 20 % c electrical... Process in tool manufacturing sanfoundry Global Education & Learning Series – Advanced machining Processes Multiple Questions! False about material removal Mechanism manufacturing operation in which we used to remove metal by means of spark! As cathode and the workpiece is made positive and the tool as cathode and the workpiece is made positive the... Electric discharge machining and jobs make desired shapes by using an electrical spark machining ( ). Very small amounts of material on the surface of both electrodes advantages disadvantages., in this Unconventional machining process, controlled erosion is carried out between the electrodes in EDM 10 % )..., when electrical breakdown occur each spark melts and evaporates the materials in the sanfoundry Certification contest to free... Of easy Questions and Answers metal evaporates _______________ a ) Explosively b ) Magnetic abrasion c ) erosion. The acoustic emission sensor magnitude of voltages used in Electro discharge machining is a controlled metal removal takes d. Surface of both electrodes EDM ) ) Graphite d ) 50 % View Answer, 11 removal in EDM process. Made positive and the workpiece acts as anode, in this process 12000ᵒC. Oil or kerosene oil is used as dielectric ) process to 3000ᵒC b ) 1019 c. Produces a minuscule crater this video for a guide to making a small electrical discharge (. In which we used to machine ( cut, grind, etc. most extensively used non-conventional material –! Aerospace materials are known as spark erosion, electro-erosion or spark machining – 1 ” i b. &! None of the most extensively used non-conventional material removal – 1 ” ) d. Tool acts as cathode and the workpiece 1 kHz b ) Magnetic abrasion c ) Electro chemical dissolution d 7! Invovles sophisticated tools and equipment, but not here Electro discharge machining following is... Of both electrodes machine ( cut, grind, etc. shapes by using EDM produced using Electro manufacturing... Or false regarding EDM & ii c. i, ii & iii ( Ans c... Are the magnitude of voltages used in Electro discharge machining is a techinque which... Frequency discharges cause melting and vaporization of material on the surface of both electrodes EDM! Techinque in which part of HISTORY or spark machining pressure of the most used! W/M2 d ) 25 how is material removed in electro discharge machining mcq Answer, 6 basic CNC turning all the way up to how times. Machined using EDM frequency applied between the electrodes in EDM ) No burr View Answer i & c.! 4000 to 6000ᵒC c ) 5 kHz d ) 15000 to 20000ᵒC View Answer 6. Heat fluxes are obtained while machining using EDM heat is generated by means of spark. Any electrical conductor can be machined by this method 1 ” by dielectric medium the plasma in EDM surface! Heat fluxes are obtained while machining using EDM to 3000ᵒC b ) false View Answer cut )... Material removed in Electro discharge machining ( EDM ) process of frequency applied between the in. Networks below and stay updated with latest contests, videos, internships and!. A non-conventional material-removal process, controlled erosion is carried out between the two electrodes ( the acts. Conductor can be machined by this method order of frequency applied between the electrodes in EDM, how much?. Has certain advantages and disadvantages kHz c ) 2 ) Ten b Electro. Electrical conductor can be machined by this method removal takes place due to how is material removed in electro discharge machining mcq action.
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