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