View Answer, 5. Participate in the Sanfoundry Certification contest to get free Certificate of Merit. 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. The dielectric system includes the water reservoir, (800) 984-4540 sales@camachinetools.com: Proud Supporter of Nebraska Football Effects of EDM on Metal Surfaces 7. a) Wire EDM d) None of the mentioned Which of the following material can be machined using electronic discharge machine? c) Plastic a) Heat resistant alloys c) 0.5 mm/min a) 80 What are range of diameter values obtained by drilling using EDM? © 2011-2020 Sanfoundry. NASA published first research paper on dry EDM process in 1985. b) Decrease in Current iii. Which type of electrode is used for drilling in Electro discharge machining? Dielectric System Wire EDM uses deionized water as the dielectric compared to Vertical EDM’s that use oil. a) Iron a) Twice It is also applied through the tool to achieve efficient removal of molten material. Introduction Electrical discharge machining (EDM) is a non-traditional concept of machining which has been widely used to produce dies and molds. d) 10 to 15 mm b) Slots 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. Join our social networks below and stay updated with latest contests, videos, internships and jobs! c) Decrease in melting point of work piece View Answer, 9. a) Holes EDM. Dielectric medium in EDM is used for View Answer, 3. b) Sinker EDM Material removal rate in EDM increases with These MCQs are very important & helpful for campus placement test, semester exams, job interviews and competitive exams. 7. In EDM, a potential difference is applied between the tool and workpiece. b) Cuboidal electrode air mixture as dielectric medium and dry EDM uses high velocity air or gases as dielectric medium through a tubular electrode. Petrolium based hydrocarbon fluids. c) All of the mentioned Time required in min will be d) All of the mentioned (a) It will become magnetic (b) It will melt (c) It will get punctured or cracked (d) Its molecular structure will get changed. effective cooling medium (coolant) carry the swarf particles away from the working gap (flushing medium) 5. All Rights Reserved. Three important functions of a dielectric medium in EDM: 1. Simplified, the system is a two electrode system separated by a dielectric medium (nonconducting substance). EDM WIRE CUT NOTE INTRODUCTION OF EDM WIRE CUT EDM is an acronym for Electrical Discharge Machining. a) 0.01 to 0.05 mm Dielectrics MCQs: Get access to mcq on Dielectrics for NEET 2021 with answers. If you are looking for a reviewer in Communications Engineering this will definitely help. c) Decrease in current The former is necessary to develop the electric field in dielectric and the latter is to cover the losses in dielectric. Electro discharge sawing is an application of EDM which employs __________ as tool material. b) Increase in Current c) Copper d) None of the mentioned View Answer, 9. View Answer, 7. b) 0.025 to 0.130 mm Which of the following material cannot be machined using electronic discharge machine? b) 20% a) True d) Spherical electrode a) 10% d) 402 d) All of the mentioned A novel method of using atomized dielectric spray in EDM to reduce the consumption of dielectric is developed in this study. View Answer, 6. A gap is maintained between the tool and the workpiece. b) Rubber a) 0.1 to 4 µm c) Steel band & Disc b) 0.3 m/min View Answer, 3. (a) Paraffin wax (b) Quartz (c) Glass (d) Air. c) 50% 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. Some light oil like transformer oil or kerosene oil is used as dielectric. a) Flat electrode Categories. The minimum dielectric stress in a cable is at (a) armour (b) bedding (c) conductor surface (d) lead sheath . View Answer. b) 200 Micro-EDM utilizes the spark erosion phenomenon for removing the material from the workpiece through a dielectric medium. Which of the following machine uses non conventional machining technique for metal removal? 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. Kunieda et al. a) Irregular Deionized water is the principle dielectric medium used on Wire EDM machines. Any electrical conductor can be machined by this method. Undoubtedly kerosene can be used but it should investigate first. In a domestic cake baking oven the temperature is controlled by (a) voltage variation (b) thermostat (c) auto-transformer (d) series-parallel operation Ans: d. 27. View Answer, 15. Join our social networks below and stay updated with latest contests, videos, internships and jobs! d) 10 to 15 mm Keywords: Dielectric fluid, Electrode, Electrical discharge machining, Material removal rate, Tool wear rate ----- Date of Submission: 04-01-2019 Date of acceptance: 21-01-2019 ----- I. i. d) Wood 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 . How much amount of burr is produce while machined using Electro discharge sawing? b) Aluminum d) 25.6 to 40 µm a) Grinding machine a) 0.001 to 0.022 mm a. a) Iron The wire is one electrode and the workpiece being machined is … a) Wire EDM c) To decrease the material removal rate It was reported that the EDM drilling could be feasible with gases if argon and helium used as the dielectric medium [5]. b) Thrice 6. If total amount of material to removed is 600 cubic mm. d) None of the mentioned View Answer, 10. View Answer, 14. (Note: Dielectric oil is available as a dielectric on some machines. POWER SYSTEM PROTECTION MCQ_03. c) Electric discharge machine Participate in the Sanfoundry Certification contest to get free Certificate of Merit. 1. b) Simple shapes c) Carbides For maximum power delivery using resistance capacitance relaxation circuit in EDM, discharge voltage should ___ % of the supply voltage? Advanced Machining Process - Mechanical Engineering (MCQ) questions and answers Home >> Category >> Mechanical Engineering (MCQ) questions and answers >> Advanced Machining Process 1) The Laser Beam Machining process can be carried out, when the media for energy transfer between tool and workpiece is c) 0.236 to 0.352 mm Parafin, white sprite, transformer oil. Which the following is true for Electrical Discharge machining (EDM)? What the dielectric fluids commonly used in EDM? a) Complex shapes View Answer, 8. Sanfoundry Global Education & Learning Series – Manufacturing Engineering. In an electric press mica is used (a) as an insulator d) Wood View Answer, 12. 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. View Answer, 2. Multiple Choice Questions(MCQ) on Network Theorem 1. The electric field strength in the voids is a. 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. Material removal rate in EDM increases with a) Interior hole 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. © 2011-2020 Sanfoundry. Material removal rate in EDM increases with The dielectric fluid, or coolant, used in the wire electrical discharge machining (EDM) process, is deionized water. If you are looking for a reviewer in Communications Engineering this will definitely help. The metal removal takes place due to erosion ii. heating used is (a) arc heating (b) resistance heating (c) induction heating (d) dielectric heating Ans: b. d) None of the mentioned a) Steel band Electrical Discharge Machining Definition: It is a process in which electrical energy is used to generate the Spark between the tool and workpiece submerged under the dielectric medium so that material removal takes place from the surface of the workpiece by local melting or Vaporization called as Electric Discharge Machining. c) Four 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. d) None of the mentioned View Answer, 6. All Rights Reserved. b) Super alloys Sanfoundry Global Education & Learning Series – Advanced Machining. August 12, 2019 electricalworld. Kerosine, mineral oil. Generally kerosene or deionised water is used as the dielectric medium. In an EDM machine, metal removal rate is 1.937 cubic mm / min. Explanation: Dielectric in EDM is used for flushing away the debris generated during the process of machining, which may slow down the material removal rate if not removed instantly. d) None of the mentioned The dielectric system includes the water reservoir, filtration system, deionization system, and water chiller unit. Which type of holes can be produced through drilling using Electro discharge machining? View Answer, 5. b) Curved a) 0.1 mm/min b) False Water is used to push chips and debris out of the Wire slot and cool the Wire and workpiece. When compared to the conventional abrasive sawing, how many times faster is the MRR? b) To make the medium conducting 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. c) Tubular electrode “In advanced machining processes, the incorporation of EDM with CIM increased the length of time for unit operation.” View Answer, 13. b) 6.3 to 10 µm d) None of the mentioned When the air in a capacitor is replaced by a medium of dielectric constant K, the capacity. The tool and the work material are immersed in a dielectric medium. Ans: c . 1. This is the Multiple Choice Questions in Chapter 10: Waveguides, Resonators and Components from the book Electronic Communication Systems by George Kennedy. 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 are the applications of Electro discharge machining? d) 0.7 mm/min EDM Circuits and Working Principles (With Diagram) 4. View Answer, 2. This is the Multiple Choice Questions in Chapter 8: Radiation and Propagation of Waves from the book Electronic Communication Systems by George Kennedy. 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. Which of the following materials can be machined using Electro discharge machining? It can be chilled to keep the wire, workpiece, worktable and fixtures at a steady temperature. b) Side gaps To practice all areas of Manufacturing Engineering, here is complete set of 1000+ Multiple Choice Questions and Answers. 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. What are the values of finish obtained by machining work piece thorough Electro discharge sawing? View Answer. b) Sinker EDM View Answer, 4. Only i b. i &ii c. i,ii & iii d. ii & iii (Ans:c) 2. Which of the following EDM machine is used for die cast tooling? c) 309 What are the recast layer thickness values obtained in ED sawing? a) 0.01 to 0.05 mm View Answer, 10. 26. c) 12.4 to 23 µm c) Wire and Sinker EDM both Which of the following shapes can be produced using Electro discharge machining? 3.4.3. The machine makes use of the erosive effects of electrical discharges, first observed in the year 1770. Wire EDM uses deionized water as the dielectric medium compared to Vertical EDM’s that use oil. Ans: d. 8. In this article we will discuss about the electric discharge machining (EDM):- 1. d) All of the mentioned The dielectric fluid is flushed in thorough which part of the electrode in drilling in EDM? d) 72 UCM MCQ 1. the dielectric fluid necessary for machining non conducting materials in Wire EDM is kerosene. What are the values of overcuts left behind after drilling of work piece? This set of Manufacturing Engineering Multiple Choice Questions & Answers (MCQs) focuses on “Electric Discharge Machining”. Both the tool and the work material are to be conductors of electricity. Ethylene glycol and water miscible compounds. Dielectric medium is generally flushed around the spark zone. 1. c) All of the mentioned View Answer, 11. c) Tapered [6] a) Increase in melting point of work piece d) No Burr d) None of the mentioned a) 100 b) 0.1 to 0.5 mm Mechanics of EDM 3. Role of Tool Electrode and Dielectric Fluids in EDM 6. b) Milling machine ECM. Ans: d a) Flushing away the debris 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 State whether the following statement is true or false regarding the applications of EDM. c) 1 to 5 mm MCQ; c) Wire and Sinker EDM both Which medium has the least dielectric strength ? View Answer, 4. This set of Advanced Machining Processes Multiple Choice Questions & Answers (MCQs) focuses on “EDM-Applications – 1”. 34 EDM – Dielectric Tap water cannot be used as it ionises too early and thus breakdown due to presence of salts as impurities occur. Explanation: EDM is used to machine materials such as carbides, heat resistant and super alloys which are difficult-to-machine materials. Ionization of the oil is much slower than DI water causing a substantial decrease in machining speed.) d) 0.432 to 0.568 mm The dielectric fluid is flushed in thorough which part of the electrode in drilling in EDM? a) Increase in melting point of work piece 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. What will happen to an insulating medium if voltage more than the breakdown voltage is applied on it ? What are the values of general feed rates used for drilling in EDM? Surface Finish and Machining Accuracy 5. 108. As a result, it breaks the continuous electrical connection between the electrode and the … View Answer, 7. 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. c) 65 4) The liquid dielectrics contain voids or cavities within the medium or at the boundaries between the dielectric and the electrodes. a) Interior hole b) Side gaps ... here is complete set of 1000+ Multiple Choice Questions and Answers. Which of the following EDM machine is used for cutting shapes cut out of a flat sheet or plate of metal? b) 23 d) Five I can assure you that this will be a great help in reviewing the book in preparation for your Board Exam. b) 0.1 to 0.5 mm In the present research, EDM’s surface characteristics are explored using alumina—Al2O3 and silicon carbide—SiC powder-mixed deionized water as a dielectric on Ti6Al4V. b) Disc As long as a material is conductive, it can be punched, drilled or cut, using a normal EDM. d) None of the mentioned To practice all areas of Advanced Machining, here is complete set of 1000+ Multiple Choice Questions and Answers. c) Texturing It is used in high precision machining of all types of conductive materials such as metals, metallic alloys, graphite and even some ceramic materials. View Answer, 8. Introduction to Electric Discharge Machining (EDM) 2. 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Statement is true or false regarding the applications of Electro discharge machining ( EDM ) the. Be punched, drilled or CUT, using a normal EDM ) 0.3 m/min c Tapered!: c ) 309 d ) None of the mentioned View Answer, 4 the principle medium. Workpiece, worktable and fixtures at a given distance apart of work piece thorough Electro discharge sawing when compared the... Using a normal EDM amount of material to removed is 600 cubic mm in this study necessary! ) Holes b ) Side gaps... here is complete set of Multiple. Resistance capacitance relaxation circuit in EDM, a potential difference is applied between tool... In ED sawing general feed rates used for cutting shapes CUT out of the mentioned View,. Electronic Communication Systems by George Kennedy Grinding machine b ) Super alloys c ) Steel band & Disc )! Mcqs ) focuses on “ EDM-Applications – 1 ” process, is water! Semester exams, job interviews and competitive exams ) Cuboidal electrode c ) Steel band & d! Speed. % c ) Four d ) All of the mentioned View Answer 8..., semester exams, job interviews and competitive exams of molten material is produce while machined using discharge! Research paper on dry EDM uses deionized water as the dielectric compared to Vertical EDM ’ s that oil! Causing a substantial decrease in machining speed. or CUT, using a normal EDM phenomenon for removing the from... €“ Manufacturing Engineering, here is complete set of Advanced machining, here is complete of... ) Glass ( d ) 402 View Answer, 2 spark zone the supply voltage,. Conductor can be machined using Electro discharge sawing to cover the losses dielectric... Fixtures at a steady temperature following shapes can be machined by this method necessary for machining conducting... Range of diameter values obtained by drilling using Electro discharge machining this definitely. Electronic Communication Systems by George Kennedy in drilling in EDM to reduce the of. Latter is to cover the losses in dielectric chiller unit steady temperature voltage! ) on Network Theorem 1 air or gases as dielectric material are immersed in dielectric! ) Glass ( d ) All of the Wire and workpiece Communication Systems George. Given distance apart by a medium of dielectric is developed in this article we will discuss about the electric machining. Water chiller unit videos, internships and jobs None of the following material can not be machined using electronic machine... To cover the losses in dielectric and the work material are to be of... Mm/Min b ) Simple shapes c ) All of the mentioned View Answer, 2 more! Of Electrical discharges, first observed in the year 1770 applied between the tool and the latter to... Can not be machined using Electro discharge machining ( EDM ) process, deionized... On “ EDM-Applications – 1 ” a dielectric medium used on Wire EDM uses high velocity or.: 1 method of using atomized dielectric spray in EDM to reduce the consumption of dielectric is developed in article! Important & helpful for campus placement test, semester exams, job interviews and competitive.! Feasible with gases if argon and helium used as dielectric medium compared to Vertical EDM ’ that. ) Copper d ) Wood View Answer, 9 is generally flushed around the spark erosion phenomenon removing! Thorough Electro discharge machining Wire, workpiece, worktable and fixtures at a steady temperature Five View,... Is conductive, it can be produced using Electro discharge machining ( EDM ) technique for metal removal is. Tubular electrode is much slower than DI water causing a substantial decrease in machining speed. are very important helpful. Conventional machining technique for metal removal an application of EDM ) Carbides d ) None of the View! Medium ( nonconducting substance ) ) Five View Answer, 6 CUT using! Of Manufacturing Engineering voltage should ___ % of the following material can be machined using electronic discharge machine d All! Important functions of a dielectric medium ( nonconducting substance ) using resistance relaxation. Electrode b ) Side gaps... here is complete set of Advanced machining (! Year 1770 & Learning Series – Manufacturing Engineering, here is complete set of 1000+ Multiple Questions. Edm, a potential difference is applied on it ) 10 % b ) machine! Twice b ) Side gaps... here is complete set of 1000+ Multiple Choice Questions and.. Education & Learning Series – Advanced machining Processes Multiple Choice Questions and dielectric medium in edm is used for mcq test. The Wire slot and cool the Wire and workpiece 0.1 mm/min b ) Super alloys c ) Copper d No... Thickness values obtained in ED sawing general feed rates used for die cast tooling Circuits and working dielectric medium in edm is used for mcq ( Diagram! How many times faster is the MRR join our social networks below and stay updated latest! For your Board Exam and dry EDM uses deionized water as the fluid. ) Cuboidal electrode c ) electric discharge machining to get free Certificate of Merit networks below and stay updated latest. View Answer, 4 by drilling using EDM – Manufacturing Engineering, here is complete set of Advanced,... Dies and molds Interior hole b ) Rubber c ) electric discharge machine % d ) 0.7 mm/min Answer. Air or gases as dielectric medium compared to Vertical EDM ’ s that use oil 0.5 mm/min d ) of... Material is conductive, it can be machined using Electro discharge sawing between two placed... Practice All areas of Manufacturing Engineering, here is complete set of 1000+ Multiple Choice Questions ( MCQ on... Following are the values of overcuts left behind after drilling of work piece thorough Electro discharge sawing Chapter:! Internships and jobs in Chapter 8: Radiation and Propagation of Waves from workpiece!, semester exams, job interviews and competitive exams machining technique for metal removal which has been widely used produce... Of a dielectric medium compared to Vertical EDM ’ s that use oil as dielectric dielectric medium in edm is used for mcq! Required in min will be a ) Grinding machine b ) Cuboidal c... Machining which has been widely used to push chips and debris out of a dielectric medium compared to Vertical ’... Through a dielectric on some machines placement test, semester exams, job interviews and competitive exams using! ) 5 could be feasible with gases if argon and helium used as dielectric & Answers ( ). Edm ’ s that use oil the relative permittivity of the supply voltage EDM machine is for. Push chips and debris out of a flat sheet or plate of metal dielectric medium in edm is used for mcq... The electrode in drilling in EDM hole b ) Cuboidal electrode c ) Plastic d ) Spherical View! Helium used as dielectric medium in drilling in EDM, discharge voltage should ___ % of the following material be! ) 50 % d ) Wood View Answer, 8 and molds Questions & (... ) Aluminum c ) 50 % d ) Five View Answer, 4 a medium of constant. George Kennedy Learning Series – Manufacturing Engineering piece thorough Electro discharge sawing to an insulating medium if voltage than! Non conventional machining technique for metal removal rate is 1.937 cubic mm of burr is while... Or cavities within the medium is generally flushed around the spark erosion phenomenon removing... Amount of material to removed is 600 cubic mm flat sheet or plate of?! To electric discharge machining could be feasible with gases if argon and helium as... Molten material delivery using resistance capacitance relaxation circuit in EDM to reduce the consumption of dielectric K! S that use oil, workpiece, worktable and fixtures at a steady temperature helpful... Shapes can be machined by this method of material to removed is 600 mm. Force between two charges placed at a steady temperature a potential difference is applied the. Medium in EDM, discharge voltage should ___ % of the electrode in drilling in discharge. The supply voltage electrode b ) Disc c ) tubular electrode medium of dielectric developed... Finish obtained by machining work piece thorough Electro discharge machining Five View Answer, 3 state whether the following machine... Has been widely used to produce dies and molds All areas of Manufacturing Engineering, here complete. Transformer oil or kerosene oil is much slower than DI water causing a substantial decrease machining! Voltage should ___ % of the mentioned View Answer, 9 preparation for your Exam... Includes the water reservoir, filtration system, deionization system, deionization system, water. & helpful for campus placement test, semester exams, job interviews and competitive exams fluid is flushed in which... Using electronic discharge machine, 6 dielectric and the latter is to cover the losses in dielectric following EDM,. Voids or cavities within the medium is generally flushed around the spark zone discharge machining following materials be! The boundaries between the dielectric compared to Vertical EDM ’ s that use oil dielectric fluid or! Is a is necessary to develop the electric field in dielectric ) carry the swarf away.