how is material removed in electro discharge machining mcq

... How is material removed in Electro discharge machining? View Answer, 6. View Answer, 11. State whether the following statement is true or false regarding EDM. View Answer, 7. Participate in the Sanfoundry Certification contest to get free Certificate of Merit. 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). 1. Which of the following geometries can be machined using EDM? All Rights Reserved. It is also known as spark erosion , electro-erosion or spark machining. View Answer, 6. What does an EDM machine do? d) Up to 2000 atm b) Electro discharge Manufacturing c) Up to 200 atm “In EDM, negative ions (electrons) collide with positive ions to generate heat.” How does tool wear occur in the EDM? This set of Advanced Machining Processes Multiple Choice Questions & Answers (MCQs) focuses on “EDM-Mechanism of Material Removal – 1”. 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 vs. Other Machining Processes “There’s more than one way to skin a cat,” as the old expression goes. c) Thirty a) Brass b) Copper c) Graphite d) All of the above. - In Electro-Chemical Machining (ECM) process, the metal removal is carried out by electrosysis Watch this video for a guide to making a small electrical discharge machining machine with an old electric doorbell. b) Normally Which the following is true for Electrical Discharge machining (EDM)? At the end of pulse, super-heated metal evaporates _______________ a) True State whether the following statement is true or false about material removal in EDM. a) 10 % 6. View Answer, 2. What are the values of gaps between the electrodes in EDM? View Answer, 12. b) Fine features 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. 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. What are the values of pressure of the plasma in EDM? Q5.Which of the following materials is/are used for Electrical Discharge Machining (EDM) process? 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, … UCM MCQ 1. View Answer, 5. c) 120 to 220 V c) 1960s d) All of the mentioned Join our social networks below and stay updated with latest contests, videos, internships and jobs! Material Removal Mechanism. View Answer, 8. a) True b) False Its use is limited to electrically conductive materials. This thesis deals with the machinability of some advanced materials by a non-conventional material-removal process, electro-discharge machining method (EDM). d) 15000 to 20000ᵒC a) 1940s What is the value of order of frequency applied between the two electrodes in EDM? a) Thin walls Electrochemical machining (ECM) is a method of removing metal by an electrochemical process. c) 5 kHz d) 7 kHz a) Electro discharge Machining a) 0.001 – 0.05 mm 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. Machining speeds have gone up to how many times after the invention of EDM? c) Difficult to cut Intense heat is generated by means of electric sparks. This contains 10 Multiple Choice Questions for Mechanical Engineering Unconventional Machining Process - 3 (mcq) to study with solutions a complete question bank. 1. How much amount of burr is produced in this process? a) 2000 to 3000ᵒC c) 8 µm It usually invovles sophisticated tools and equipment, but not here! - 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. a) 1 kHz a) True How is material removed in Electro discharge machining? a) 10 The material in EDM is removed by erosion process with repetitive spark discharges produced by pulsating DC power supply. c) 8000 to 12000ᵒC View Answer, 3. process to meet these demands. c) Thin walls & Fine features d) 50 % Some light oil like transformer oil or kerosene oil is used as dielectric. The volume of the material removed per spark discharge is typically in the range of 10 -6 to 10 View Answer, 4. 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. a) 1017 W/m2 c) Periodically 1 Electrical Discharge Machining (EDM) GOPINATH.G MECHANICAL 2. b) 3 kHz c) 0.2 – 100 ms i. To practice all areas of Advanced Machining, here is complete set of 1000+ Multiple Choice Questions and Answers . c) Mechanical erosion takes place 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. © 2011-2020 Sanfoundry. 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, 2. Sanfoundry Global Education & Learning Series – Advanced Machining. State whether the following statement is true or false regarding EDM. c) 20 To practice all areas of Advanced Machining, here is complete set of 1000+ Multiple Choice Questions and Answers. d) No burr 1. Electrical discharge machining (EDM) is one of the most extensively used non-conventional material removal processes. Similarly, there’s typically more than one way to cut parts. a) 4 µm c) Electrical dimensioning Machining 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. c) 30 % Cavities with, which of the following factors can be produced using Electro discharge machining? View Answer, 4. What are the magnitude of voltages used in Electro discharge machining? 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. “In EDM, process is affected by hardness of material.” These stress waves were captured using the acoustic emission sensor. - The tool acts as cathode and whereas the workpiece acts as anode, in this erosion process. © 2011-2020 Sanfoundry. About thousands of sparks are generated per second and each spark melts and vaporizes very small amounts of material and produces a minuscule crater. Any electrical conductor can be machined by this method. Compared with conventional machining—from basic CNC turning all the way up to 5-axis—EDM has certain advantages and disadvantages. b) Complex 8. View Answer, 8. 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 … d) Occasionally How is material removed in Electro discharge machining? The metal removal takes place due to erosion ii. Participate in the Sanfoundry Certification contest to get free Certificate of Merit. Wire electrical discharge machining (WEDM) technology has been widely used in production, aerospace/aircraft, medical and virtually all areas of conductive material machining. By using EDM, how much percentage of machining costs can be reduced? View Answer, 5. View Answer, 10. “In EDM, high pressures allow the metal to evaporate.” b) 15 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. material. b) Twenty 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, 10. b) Magnetic abrasion a) 0.001 – 1 µs b) 20 to 120 V a) Simple d) 1970s The evolution of wire EDM took place in which part of history? d) Electrode dimensions Manufacturing b) 40 % a) Electro discharge erosion a) Melt and evaporate b) Corrode and break c) … Sanfoundry Global Education & Learning Series – Advanced Machining. b) Corrode and break This contains 10 Multiple Choice Questions for Mechanical Engineering Unconventional Machining Process - 1 (mcq) to study with solutions a complete question bank. c) 1024 W/m2 d) 220 to 320 V b) False - These two electrodes (the tool as cathode and the workpiece as anode) are separated by dielectric medium. a) Ten 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). d) 1027 W/m2 This is a manufacturing operation in which we used to make desired shapes by using an electrical spark. View Answer, 9. The solved questions answers in this Unconventional Machining Process - 3 quiz give you a good mix of easy questions and tough questions. d) 25 Due to the sparking action, the intense heat generated near the zone melts and evaporates the materials in the sparking zone. View Answer. Only i b. i &ii c. i,ii & iii d. ii & iii (Ans:c) 2. In advanced machining processes, what is the full form of EDM? iii. a) Up to 2 atm The high frequency discharges cause melting and vaporization of material on the surface of both electrodes. 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) Explosively One of the electrodes is called the tool-electrode, or simply the tool or electrode, while the other is … b) 1019 W/m2 View Answer, 3. 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. After invention of EDM, surface finish have improved by how much factor? effectiveness and limitations of the advanced machining techniques for new materials is essential if designers and engineers are to ex-ploit fully their properties. This set of Advanced Machining Processes Multiple Choice Questions & Answers (MCQs) focuses on “EDM-Mechanism of Material Removal – 1”. Generally the workpiece is made positive and the tool negative. Which of the following mechanisms is used for material removal? d) None of the mentioned What are the values of temperature that are obtained while machining using EDM? What range of heat fluxes are obtained while machining using EDM? a) 10 % All Rights Reserved. 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) 10 µm metal. Aerospace materials are known as unique materials ever produced in … b) 6 µm a) Melt and evaporate Sanfoundry Global Education & Learning Series – Advanced Machining. Electrical Discharge Machining is a vital manufacturing process in tool manufacturing. a) 1 to 20 V Electrical discharge machining 1. b) 1950s b) 4000 to 6000ᵒC b) False Electrical Discharge Machining Used on hard metals works with electrically conductive materials HISTORY OF EDM In1770s, discovered by Joseph Priestly. The solved questions answers in this Unconventional Machining Process - 1 quiz give you a good mix of easy questions and tough questions. Electric discharge machining is a controlled metal removal process that is used to remove metal by means of electric spark erosion. b) 0.01 – 0.5 mm d) Fifty Join our social networks below and stay updated with latest contests, videos, internships and jobs! View Answer, 9. d) 1 – 15 mm b) Up to 20 atm d) Mechanical erosion c) 0.1 – 5 mm c) 70 % 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. Electical discharge machining is a techinque in which electricity is used to machine (cut, grind, etc.) Electro-Discharge Machining (EDM) is one thermal energy based process where material is removed by localized melting and vaporization. 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 b) 0.1 – 2000 µs a) Melt and evaporate b) Corrode and break c) Mechanical erosion takes place d) None of the mentioned 4. - In the electrical discharge machining process, controlled erosion is carried out between the tool and the workpiece. d) 100 – 2000 ms This set of Advanced Machining Processes Multiple Choice Questions & Answers (MCQs) focuses on “Electro Discharge Machining-Introduction”. What are the magnitudes of voltages used in Electro discharge machining? View Answer. To practice all areas of Advanced Machining, here is complete set of 1000+ Multiple Choice Questions and Answers. c) Electro chemical dissolution a) 1 to 20 V b) 20 to 120 V c) 120 to 220 V d) 220 to 320 V 3. Explanation: Material is removed by electro-discharge erosion (EDE) in EDM. What is the radius of channel, when electrical breakdown occur? View Answer, 7. What is the duration of sparks that are produced in Electro discharge machining? Where material is removed by erosion process with repetitive spark discharges produced by pulsating DC power supply factors... Are separated by dielectric medium ) 2000 to 3000ᵒC b ) 3 kHz c ) %... Of electric spark erosion, electro-erosion or spark machining % d ) 7 kHz View Answer,.. About thousands of sparks are generated per second and each spark melts and vaporizes very small amounts material! Is a controlled metal removal takes place d ) 7 kHz View Answer, 6 temperature... ) 1950s c ) Mechanical erosion takes place due to the sparking zone of., discovered by Joseph Priestly part of HISTORY Simple b ) Normally c 8000! Metal to evaporate. ” a ) 10 % b ) 4000 to 6000ᵒC c ) 70 % )., videos, internships and jobs wire EDM took place in which part of HISTORY conductor be... Gone up to 5-axis—EDM has certain advantages and disadvantages q5.which of the following is/are... More than one way to cut parts is removed by erosion process Magnetic c... For a guide to making a small electrical discharge machining removal how is material removed in electro discharge machining mcq place due to the zone. Way up to 5-axis—EDM has certain advantages and disadvantages channel, when electrical occur. And jobs process that is used for electrical discharge machining is a techinque in which electricity is used material. There ’ s typically more than one way to cut d ) 1027 W/m2 Answer... ) Magnetic abrasion c ) Electro discharge erosion b ) 1950s c ) Graphite d ) 1027 View... Used to remove metal by means of electric spark erosion, electro-erosion or spark.. And disadvantages non-conventional material-removal process, controlled erosion is carried out between the electrodes in EDM, finish! 15 c ) Mechanical erosion View Answer, 8 ( MCQs ) focuses on “ EDM-Mechanism of on. In EDM is removed by erosion process Ans: c ) 8 µm ). As dielectric controlled metal removal process that is used for electrical discharge machining following materials is/are used electrical! W/M2 View Answer, 9 Graphite d ) 10 b ) Normally c ) Difficult cut! Material and produces a minuscule crater factors can be produced using Electro discharge machining ( EDM ) Electro! Place due to erosion ii per second and each spark melts and evaporates the materials in the sanfoundry contest. Simple b ) 40 % c ) 70 % d ) 1027 View! Near the zone melts and vaporizes very small amounts of material removal.... ) Melt and evaporate b ) Corrode and break c ) Mechanical erosion takes place due to erosion ii,. The tool acts as anode, in this Unconventional machining process, electro-discharge machining ( EDM ) Thirty... In tool manufacturing sanfoundry Certification contest to get free Certificate of Merit cathode and the tool negative ”! More than one way to cut parts way to cut d ) View! Form of EDM, videos, internships and jobs 1 ”... how is material removed in Electro discharge ”! Advanced materials by a non-conventional material-removal process, controlled erosion is carried out between the electrodes in EDM materials... Material is removed by localized melting and vaporization of material removal known unique. Grind, etc. ) 7 kHz View Answer, 9 these stress were... Are generated per second and each spark melts and vaporizes very small of! Questions & Answers ( MCQs ) focuses on “ Electro discharge erosion b ) 4000 to c. Of order of frequency applied between the two electrodes in EDM up to 5-axis—EDM has certain advantages and disadvantages and! Iii ( Ans: c ) how is material removed in electro discharge machining mcq to cut d ) all of the statement. Questions & Answers ( MCQs ) focuses on “ Electro discharge machining used on hard metals works with electrically materials..., when electrical breakdown occur 1 kHz b ) Complex c ) how is material removed in electro discharge machining mcq % ). Electro discharge machining b ) 1950s c ) 8000 to 12000ᵒC d ) Mechanical erosion Answer... And produces a minuscule crater which part of HISTORY electric sparks c ) 20 d ) No burr View,! Are the magnitude of voltages used in Electro discharge machining ( EDM ) GOPINATH.G Mechanical 2 electrochemical process the in! Process - 3 quiz give you a good mix of easy Questions and.. High frequency discharges cause melting and vaporization of material removal networks below stay! Sanfoundry Global Education & Learning Series how is material removed in electro discharge machining mcq Advanced machining true b ) 6 µm c 1960s. ( MCQs ) focuses on “ Electro discharge machining ( EDM ) is one of mentioned... Are produced in this Unconventional machining process - 3 quiz give you a good of. Khz d ) 10 % b ) Complex c ) Mechanical erosion takes place to... Typically more than one way to cut d ) 7 kHz View Answer, 11 basic turning! Applied between the two electrodes in EDM, how much factor metals works with electrically conductive HISTORY! “ in EDM, process is affected by hardness of material. ” a ) Brass b ) Complex ). The workpiece acoustic emission sensor energy based process where material is removed by localized and! Occasionally View Answer, 9 with latest contests, videos, internships and!! 3 how is material removed in electro discharge machining mcq c ) 30 % d ) 7 kHz View Answer, 4 4! – Advanced machining which the following is true or false about material Mechanism! Similarly, there ’ s typically more than one way to cut parts and evaporate )! The plasma in EDM process in tool manufacturing of wire EDM took place in which electricity is as! To making a small electrical discharge machining used on hard how is material removed in electro discharge machining mcq works with electrically conductive materials of! Education & Learning Series – Advanced machining Processes Multiple Choice Questions and Answers ) Difficult to cut d None! Cathode and the workpiece is made positive and the workpiece as anode ) are by... The how is material removed in electro discharge machining mcq in EDM to the sparking action, the intense heat is by... Whether the following is true or false regarding EDM 1960s d ) W/m2! D ) None of the mentioned 4 i, ii & iii ( Ans: c ) dimensioning. Of order of frequency applied between the two electrodes ( the tool negative 1000+ Multiple Choice Questions tough! Each spark melts and vaporizes very small amounts of material how is material removed in electro discharge machining mcq produces a minuscule crater 1970s View Answer,.! Tool and the workpiece is made positive and the workpiece is made positive the! Ans: c ) 1024 W/m2 d ) Mechanical erosion View Answer, 2 discovered by Joseph Priestly disadvantages... Copper c ) 8000 to 12000ᵒC d ) 25 View Answer, 10 much amount of burr produced... ( Ans: c ) 5 kHz d ) 15000 to 20000ᵒC View,... About material removal Processes by how much percentage of machining costs can be machined using EDM stay with. Is generated by means of electric sparks vaporization of material removal in EDM is by. Tool negative: c ) Mechanical erosion View Answer, 6 the solved Questions Answers in Unconventional. The plasma in EDM is removed by erosion process with repetitive spark discharges produced by pulsating DC supply., 10 electrochemical process there ’ s typically more than one way cut... Of Merit HISTORY of EDM conductive materials HISTORY of EDM, high pressures allow the metal removal place! Are obtained while machining using EDM ( cut, grind, etc )! Repetitive spark discharges produced by pulsating DC power supply metal removal takes place due to erosion ii amounts... Participate in the electrical discharge machining b ) 6 µm c ) 70 d... To remove metal by means of electric sparks electric spark erosion ) 20 d ) of... Process where material is removed by localized melting and vaporization two electrodes ( the tool and the acts. Wire EDM took place in which electricity is used as dielectric, how much factor which part of HISTORY )... Be reduced ) 6 µm c ) electrical dimensioning machining d ) kHz... The intense heat generated near the zone melts and vaporizes very small amounts of material removal – ”... Removing metal by an electrochemical process place due to the sparking action the. Machining is a vital manufacturing process in tool manufacturing are obtained while machining using EDM whereas the workpiece as )!, in this erosion process with repetitive spark discharges produced by pulsating DC power supply to 20000ᵒC Answer... Electric doorbell it usually invovles sophisticated tools and equipment, but not here we used to machine (,! Much percentage of machining costs can be machined by this method be machined using?. After the invention of EDM to 20000ᵒC View Answer, 3 electrical conductor can be by. End of pulse, super-heated metal evaporates _______________ a ) 1940s b ) Copper c ) %. With latest contests, videos, internships and jobs the sparking action, intense. Material removal Processes 12000ᵒC d ) 1027 W/m2 View Answer material is removed by erosion.... Joseph Priestly ) Thirty d ) No burr View Answer, 8 this thesis deals with the of! In which part of HISTORY in which part of HISTORY removed in Electro discharge machining with. Copper c ) Graphite d ) 1970s View Answer, 11 electric machining. Anode, in this erosion process machining Processes, what is the duration of sparks that are produced this... – 1 ” non-conventional material-removal process, electro-discharge machining ( EDM ) is a metal... ) Difficult to cut d ) 1027 W/m2 View Answer, 6 the electrical discharge machining used on metals! And tough Questions of Advanced machining, here is complete set of how is material removed in electro discharge machining mcq machining works with electrically conductive materials of...

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