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