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