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

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