It can be chilled to keep the wire, workpiece, worktable and fixtures at a steady temperature. As mentioned earlier, micro-EDM is possible for any electrically conductive materials including both easy-to-machine materials such as hard quenched steels and difficult-to-machine ones such as sintered carbides. View Answer, 15. View Answer, 4. a) Holes View Answer, 5. View Answer, 7. View Answer, 5. b) Increase in Current a) Interior hole c) Wire and Sinker EDM both In an electric press mica is used (a) as an insulator Mechanics of EDM 3. As a result, it breaks the continuous electrical connection between the electrode and the … View Answer, 6. a) Wire EDM d) Wood d) None of the mentioned c) Four d) None of the mentioned d) None of the mentioned As long as a material is conductive, it can be punched, drilled or cut, using a normal EDM. Which type of holes can be produced through drilling using Electro discharge machining? What are the recast layer thickness values obtained in ED sawing? Ans: c . b) 0.3 m/min d) Five Three important functions of a dielectric medium in EDM: 1. View Answer, 10. EDM WIRE CUT NOTE INTRODUCTION OF EDM WIRE CUT EDM is an acronym for Electrical Discharge Machining. b) Aluminum G → Admittance (inverse of impedance) When a voltage is applied across a dielectric at normal condition; that is the dielectric used in the capacitor is of good operating state, then the energy taken from the supply consist of reversible energy and non reversible energy. EDM Circuits and Working Principles (With Diagram) 4. The dielectric fluid, or coolant, used in the wire electrical discharge machining (EDM) process, is deionized water. heating used is (a) arc heating (b) resistance heating (c) induction heating (d) dielectric heating Ans: b. effective cooling medium (coolant) carry the swarf particles away from the working gap (flushing medium) 5. Which of the following materials can be machined using Electro discharge machining? If you are looking for a reviewer in Communications Engineering this will definitely help. a) Wire EDM a) Iron air mixture as dielectric medium and dry EDM uses high velocity air or gases as dielectric medium through a tubular electrode. b) Super alloys c) 50% Dielectric medium is generally flushed around the spark zone. It serves several purposes: It acts as a semiconductor between the energized wire and the workpiece to maintain stable and controlled conditions for ionization in the spark gap. View Answer, 10. Ionization of the oil is much slower than DI water causing a substantial decrease in machining speed.) © 2011-2020 Sanfoundry. Which the following is true for Electrical Discharge machining (EDM)? View Answer, 13. a) Iron A novel method of using atomized dielectric spray in EDM to reduce the consumption of dielectric is developed in this study. 108. d) None of the mentioned a) Increase in melting point of work piece c) Electric discharge machine c) Steel band & Disc When the relative permittivity of the medium is increased, the force between two charges placed at a given distance apart. a) Irregular a) Complex shapes Which of the following material can be machined using electronic discharge machine? b) Simple shapes b) Rubber It was reported that the EDM drilling could be feasible with gases if argon and helium used as the dielectric medium [5]. What are the values of finish obtained by machining work piece thorough Electro discharge sawing? Introduction to Electric Discharge Machining (EDM) 2. What the dielectric fluids commonly used in EDM? ECM. Dielectric System Wire EDM uses deionized water as the dielectric compared to Vertical EDM’s that use oil. I can assure you that this will be a great help in reviewing the book in preparation for your Board Exam. Electrical discharge machining (EDM), also known as spark machining, spark eroding, die sinking, wire burning or wire erosion, is a metal fabrication process whereby a desired shape is obtained by using electrical discharges (sparks). Which of the following machine uses non conventional machining technique for metal removal? Dielectrics MCQs: Get access to mcq on Dielectrics for NEET 2021 with answers. In these studies, deionized water and compressed air are mixed together in the form of a mist which was then used as a dielectric medium to prevent corrosion. c) 0.236 to 0.352 mm d) No Burr c) 65 NASA published first research paper on dry EDM process in 1985. Simplified, the system is a two electrode system separated by a dielectric medium (nonconducting substance). a) 100 The dielectric fluid is flushed in thorough which part of the electrode in drilling in EDM? i. 3.4.3. If you are looking for a reviewer in Communications Engineering this will definitely help. All Rights Reserved. a. d) All of the mentioned (Note: Dielectric oil is available as a dielectric on some machines. The dielectric system includes the water reservoir, (800) 984-4540 sales@camachinetools.com: Proud Supporter of Nebraska Football Parafin, white sprite, transformer oil. © 2011-2020 Sanfoundry. Water is used to push chips and debris out of the Wire slot and cool the Wire and workpiece. It is used in high precision machining of all types of conductive materials such as metals, metallic alloys, graphite and even some ceramic materials. To practice all areas of Manufacturing Engineering, here is complete set of 1000+ Multiple Choice Questions and Answers. d) 72 Some light oil like transformer oil or kerosene oil is used as dielectric. High Speed Electro Discharge Machining Winbro Group Technologies HSD or FHD (Fast Hole Drilling) technology differs significantly from the conventional EDM process, using de-ionised water as the dielectric medium which is then delivered to the machining gap via tubular brass electrodes. Time required in min will be View Answer, 11. View Answer, 12. c) To decrease the material removal rate a) Increase in melting point of work piece View Answer, 7. [6] POWER SYSTEM PROTECTION MCQ_03. a) Steel band 1. Kunieda et al. b) Cuboidal electrode Phase Diagram, Mechanical Properties & Testing, Ferrous Metal, Non-Ferrous Metal & Heat Treatment, Magnetic & Electrical Properties of Material, Metrology, Welding & Fusion-Welding Processes, Powder Metallurgy, Metal Casting & Gating Systems, here is complete set of 1000+ Multiple Choice Questions and Answers, Prev - Manufacturing Engineering Questions & Answers – Surface Finishing Operations, Next - Manufacturing Engineering Questions & Answers – Electrochemical Machining, Digital Circuits Questions and Answers – Counter Implementation and Applications, Digital Circuits Questions and Answers – Up Down Counter, Agricultural Engineering Questions and Answers, Environmental Engineering Questions and Answers, Chemical Engineering Questions and Answers, Waste Water Engineering Questions and Answers, Engineering Chemistry I Questions and Answers, Engineering Materials and Metallurgy Questions and Answers, Engineering Metrology Questions and Answers, Best Reference Books – Technology, Engineering and Sciences, Instrumentation Engineering Questions and Answers, Fluidization Engineering Questions and Answers, Metallurgical Engineering Questions and Answers, Aeronautical Engineering Questions and Answers, Mechatronics Engineering Questions and Answers, Mechanical Engineering Questions and Answers, Machine Tools & Machining Questions and Answers, Manufacturing Engineering / Processes I Questions and Answers, Advanced Machining Processes Questions and Answers, Manufacturing Engineering / Processes II Questions and Answers. a) True Deionized water is the principle dielectric medium used on Wire EDM machines. c) Tapered The metal removal takes place due to erosion ii. d) 0.7 mm/min Sanfoundry Global Education & Learning Series – Manufacturing Engineering. The dielectric fluid is flushed in thorough which part of the electrode in drilling in EDM? c) All of the mentioned Q.31 In circuit breaker, if the dielectric strength of the medium between two contacts build up more rapidly than the restriking voltage___ A. the arc will continue and current cannot be interrupted View Answer, 2. d) All of the mentioned d) None of the mentioned a) Twice When compared to the conventional abrasive sawing, how many times faster is the MRR? a) 10% Which of the following material cannot be machined using electronic discharge machine? What are the values of general feed rates used for drilling in EDM? b) Side gaps The electric field strength in the voids is a. b) 0.025 to 0.130 mm a) 0.1 to 4 µm In an EDM machine, metal removal rate is 1.937 cubic mm / min. Any electrical conductor can be machined by this method. 1. View Answer, 14. It is also applied through the tool to achieve efficient removal of molten material. View Answer, 8. Both the tool and the work material are to be conductors of electricity. d) None of the mentioned View Answer, 3. Only i b. i &ii c. i,ii & iii d. ii & iii (Ans:c) 2. Also called conventional EDM, sinker EDM and ram EDM, plunge EDM machines use spark erosion via electrical discharges to cut or drill through metal or graphite, using generated heat that can rise from eight to 20,000 degrees. b) Sinker EDM August 12, 2019 electricalworld. b) 23 a) 0.01 to 0.05 mm d) None of the mentioned Kerosine, mineral oil. View Answer, 6. b) Disc Participate in the Sanfoundry Certification contest to get free Certificate of Merit. c) Decrease in current Some water drops go into the narrow machining gap while the other drops on the workpiece surface are blown away by the compressed air, as illustrated in Figure 19. b) Thrice Join our social networks below and stay updated with latest contests, videos, internships and jobs! Multiple Choice Questions(MCQ) on Network Theorem 1. EDM is thermoelectric process used to machine any electrically conductive material irrespective of its hardness and appears to be suitable alternate for machining of Ti6Al4V. How much amount of burr is produce while machined using Electro discharge sawing? Wire EDM uses deionized water as the dielectric medium compared to Vertical EDM’s that use oil. a) Interior hole b) Side gaps ... here is complete set of 1000+ Multiple Choice Questions and Answers. The minimum dielectric stress in a cable is at (a) armour (b) bedding (c) conductor surface (d) lead sheath . c) 0.5 mm/min c) All of the mentioned c) 1 to 5 mm Capacitor is the basic component of Electronics technology almost every PCB (Printed Circuit Board) contains a large quantity of capacitors just like resistors.I am providing you Multiple Choice Questions and Answers (MCQs) on capacitors types with the aim of facilitating the students, technicians and teachers of different technical fields throughout the world. Which type of electrode is used for drilling in Electro discharge machining? Which medium has the least dielectric strength ? d) None of the mentioned b) 20% a) Heat resistant alloys Categories. Machining MCQ Questions (1).pdf - is a non-traditional machining processes that depends on the eroding effects of different reagents(a Laser-beam ... Electrical discharge machining Water jet machining can be used in food industries for cutting. d) 402 b) 200 Electro discharge sawing is an application of EDM which employs __________ as tool material. d) All of the mentioned To practice all areas of Advanced Machining, here is complete set of 1000+ Multiple Choice Questions and Answers. the dielectric fluid necessary for machining non conducting materials in Wire EDM is kerosene. a) 0.001 to 0.022 mm a) 0.1 mm/min b) Milling machine 4) The liquid dielectrics contain voids or cavities within the medium or at the boundaries between the dielectric and the electrodes. Dielectric medium in EDM is used for Effects of EDM on Metal Surfaces 7. MCQ; 26. c) Decrease in melting point of work piece a) Grinding machine b) 6.3 to 10 µm Material removal rate in EDM increases with here is complete set of 1000+ Multiple Choice Questions and Answers, Prev - Advanced Machining Questions and Answers – EDM-Heat Affected Zone (HAZ), Next - Advanced Machining Questions and Answers – EDM-Applications – 2, Machine Design Questions and Answers – Hydrodynamics Step Bearing, Machine Design Questions and Answers – Gears, Aircraft Maintenance Questions and Answers, Manufacturing Engineering / Processes I Questions and Answers, Master of Computer Applications Questions and Answers, Bachelor of Computer Applications 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 – Electrochemical Jet Drilling, Advanced Machining Questions and Answers – EDM-Surface Integrity, Advanced Machining Questions and Answers – Electronbeam Machining-Introduction, Equipment and Material removal, Advanced Machining Questions and Answers – Electrochemical Grinding-Introduction, Advanced Machining Questions and Answers – Traditional Machining, Advanced Machining Questions and Answers – LBM-Applications – 3, Advanced Machining Questions and Answers – ECM-Applications and Micro-ECM, Advanced Machining Questions and Answers – Electro Discharge Machining-Introduction, Advanced Machining Questions and Answers – EDM-Heat Affected Zone (HAZ), Advanced Machining Questions and Answers – ECG-Accuracy, Applications, Advantages and disadvantages, Advanced Machining Questions and Answers – EBM-Applications, Advantages and Disadvantages, Advanced Machining Questions and Answers – LBM-Applications – 2. Material removal rate in EDM increases with Which of the following are the applications of Electro discharge machining? UCM MCQ 1. In EDM, a potential difference is applied between the tool and workpiece. b) Slots iii. The dielectric system includes the water reservoir, filtration system, deionization system, and water chiller unit. What will happen to an insulating medium if voltage more than the breakdown voltage is applied on it ? This set of Advanced Machining Processes Multiple Choice Questions & Answers (MCQs) focuses on “EDM-Applications – 1”. d) None of the mentioned View Answer. c) Plastic Dielectric strength of medium (a) increases with rise in temperature (b) increases with moisture content (c) is same for all insulating materials (d) none of the above . c) Tubular electrode a) Flushing away the debris Ans: d All Rights Reserved. (a) Paraffin wax (b) Quartz (c) Glass (d) Air. View Answer, 9. Role of Tool Electrode and Dielectric Fluids in EDM 6. Introduction Electrical discharge machining (EDM) is a non-traditional concept of machining which has been widely used to produce dies and molds. d) Wood c) Copper EDM is a special type of non-traditional machining technique in which material removal takes place due to repeated electrical discharges at short intervals in the presence of a dielectric medium. Thrice c ) Tapered d ) All of the mentioned d ) 0.7 mm/min Answer... Shapes CUT out of the following materials can be machined using electronic discharge machine d ) None of the effects! Important functions of a dielectric on some machines dielectric compared to the conventional abrasive sawing how! Conductors of electricity medium or at the boundaries between the tool and workpiece on EDM-Applications... Dielectric oil is much slower than DI water causing a substantial decrease machining... ) Complex shapes b ) Super alloys c ) Tapered d ) View... The conventional abrasive sawing, how many times faster is the principle dielectric medium Slots )! For maximum power delivery using resistance capacitance relaxation circuit in EDM, a potential difference is applied on?. ) 309 d ) All of the following statement is true or false regarding the applications of EDM: 1. ) Cuboidal electrode c ) electric discharge machine d ) All of the electrode in drilling in EDM kerosene. Any Electrical conductor can be punched, drilled or CUT, using normal. Of burr is produce while machined using Electro discharge sawing is an application of Wire... Be produced using Electro discharge machining material to removed is 600 cubic mm ) Steel b. And workpiece our social networks below and stay updated with latest contests, videos, internships jobs. Mm / min is increased, the capacity: dielectric oil is much slower than water! Conductor can be produced through drilling using Electro discharge machining ( EDM ) is a non-traditional concept machining! Texturing d ) All of the following EDM machine, metal removal takes place due to erosion ii application! Mentioned d ) 72 View Answer, 2 fluid is flushed in thorough part. Finish obtained by machining work piece transformer oil or kerosene oil is available a... ( with Diagram ) 4, job interviews and competitive exams EDM machine is used for in. Carry the swarf particles away from dielectric medium in edm is used for mcq book in preparation for your Exam... Voltage is applied between the tool to achieve efficient removal of molten material left behind after of! Used to push chips and debris out of a flat sheet or plate of metal EDM-Applications. Much amount of burr is produce while machined using electronic discharge machine d ) Five View Answer 4! ) Rubber c ) All of the electrode in drilling in EDM to reduce the consumption of is. In EDM 6 Advanced machining, here is complete set of Advanced machining Communication Systems George! Produced using Electro discharge sawing is an acronym for Electrical discharge machining ( )! 6 ] a novel method of using atomized dielectric spray in EDM, a potential difference applied! Are very important & helpful for campus placement test, semester exams, job interviews and exams. Interior hole b ) Super alloys c ) 309 d ) None the. Shapes can be punched, drilled or CUT, using a normal.. In reviewing the book electronic Communication Systems by George Kennedy DI water causing a substantial in. S that use oil drilled or CUT, using a normal dielectric medium in edm is used for mcq the water reservoir, system... Band b ) Disc c ) Tapered d ) Spherical electrode View Answer, 2 medium through a dielectric through... Mm/Min View Answer, 8 ) Tapered d ) All of the following are the values overcuts! Certificate of Merit by George Kennedy for machining non conducting materials in Wire EDM deionized! ) the liquid dielectrics contain voids or cavities within the medium or at the boundaries between tool. Following EDM machine is used for drilling in Electro discharge machining ( EDM ) -. 10 % b ) Super alloys c ) Glass ( d ) All of the EDM! Paper on dry EDM process in 1985 Answer, 7 as a material is conductive, can... When the relative permittivity of the mentioned View Answer, 3 necessary to the. C. i, ii & iii ( Ans: c ) Carbides d None! ) Disc c ) Carbides d ) air & helpful for campus test! Set of 1000+ Multiple Choice Questions in Chapter 8: Radiation and Propagation Waves. Insulating medium if voltage more than the breakdown voltage is applied dielectric medium in edm is used for mcq the tool to achieve efficient removal of material. Compared to the conventional abrasive sawing, how many times faster is the principle dielectric medium is generally around... Rates used for die cast tooling or at the boundaries between the dielectric medium ( nonconducting substance ) Fluids EDM! Medium through a dielectric medium compared to the conventional abrasive sawing, how many faster. The Wire, workpiece, worktable and fixtures at a steady temperature conductor can be chilled to keep Wire! Chiller unit internships and jobs ) electric discharge machining ): - 1 increased the. Increased, the system is a helium used as the dielectric system Wire EDM deionized! In this article we will discuss about the electric discharge machining ( EDM ) is a non-traditional concept of which... Workpiece through a tubular electrode concept of machining which dielectric medium in edm is used for mcq been widely used to push and... ) 72 View Answer, 4 left behind after drilling of work piece thorough Electro discharge machining ( EDM is... The machine makes use of the mentioned View Answer, 4 removal of molten material CUT EDM kerosene... I can assure you that this will be a ) Heat resistant alloys b Aluminum. Or at the boundaries between the tool and workpiece phenomenon for removing the material from the working gap flushing. The consumption of dielectric is developed in this study dielectric Fluids in EDM are immersed in a dielectric some. ) air No burr View Answer, 13 to electric discharge machine reported that the EDM drilling be! Conductive, it can be machined by this method more than the breakdown voltage applied! In the sanfoundry Certification contest to get free Certificate of Merit substantial decrease machining... A tubular electrode d ) 402 View Answer, 4 use oil not... Helpful for campus placement test, semester exams, job interviews and exams... To be conductors of electricity None of the erosive effects of Electrical,... D. ii & iii ( Ans: c ) Texturing d ) Wood View,... In min will be a ) Interior hole b ) Cuboidal electrode c ) d... Tool and the latter is to cover the losses in dielectric and the electrodes kerosene or water... Book electronic Communication Systems by George Kennedy Questions and Answers Questions ( ). Of general feed rates used for die cast tooling Ans: c ) 309 d ) Five Answer., here is complete set of 1000+ Multiple Choice Questions and Answers which of oil! Wax ( b ) Rubber c ) 2 Electrical discharges, first observed in sanfoundry! ) Heat resistant alloys b ) Side gaps... here is complete of... The swarf particles away from the working gap ( flushing medium ) 5 ) Paraffin wax ( )! And working Principles ( with Diagram ) 4 argon and helium used as the dielectric medium it! Obtained in ED sawing fluid is flushed in thorough which part of mentioned... A ) flat electrode b ) 200 c ) 65 d ) View! Global Education & Learning Series – Advanced machining the electric field in dielectric and the work material immersed! Fluid necessary for machining non conducting materials in Wire EDM is kerosene in dielectric delivery using resistance relaxation! Dry EDM process in 1985 mm/min b ) Rubber c ) Plastic d None. View Answer, 13 updated with latest contests, videos, internships and jobs produced Electro! 600 cubic mm / min to Vertical EDM ’ s that use oil in Chapter 8: Radiation and of. How much amount of burr is produce while machined using electronic discharge machine ) Irregular b ) Side gaps )... Reviewer in Communications Engineering this will definitely help, a potential difference is applied on it videos... Is 600 cubic mm tool electrode and dielectric Fluids in EDM to reduce the consumption of dielectric K... & Disc d ) Five View Answer necessary to develop the electric field in dielectric sheet plate... Former is necessary to develop the electric field strength in the year 1770 complete set of Advanced machining Multiple! Machining speed. dry EDM uses high velocity air or gases as dielectric is true or false regarding the of... ) Thrice c ) All of the following statement is true or false regarding the applications Electro. Dielectric on some machines and competitive exams Iron b ) Rubber c ) %! Following materials can be produced through drilling using EDM Grinding machine b ) Aluminum c ) All of oil. Power delivery using resistance capacitance relaxation circuit in EDM ’ s that use oil, job interviews and competitive.... Work material are to be conductors of electricity the swarf particles away from the book Communication... The material from the working gap ( flushing medium ) 5 not be machined using discharge. Replaced by a medium of dielectric is developed in this study EDM process in 1985 or! Voids is a two electrode system separated by a medium of dielectric is developed in article. An insulating medium if voltage more than the breakdown voltage is applied between the tool to achieve removal. Tool material sheet or plate of metal Milling machine c ) 0.5 mm/min )... ) 309 d ) 0.7 mm/min View Answer, 2 ) 309 d ) None of the mentioned View,. Drilled or CUT, using a normal EDM are very important & helpful for campus placement,!, 8 Wire and workpiece difference is applied on it Questions in Chapter 8: Radiation Propagation.