The production of free electrons is obtained from thermo-electronic cathodes wherein metals are heated to the temperature at which the electrons gain enough speed for escaping to the space around the cathode. a) vacuum chamber. This contains 10 Multiple Choice Questions for Mechanical Engineering Unconventional Machining Process - 3 (mcq) to study with solutions a complete question bank. d) … A typical triode EBM gun functions in a manner very similar to an EBW gun. Electron beam machin mcq, mcqs on electron beam machining, multiple choice questions on electron beam machining, electron beam machining multiple choice question, electron beam machining objective questions, quiz on electron beam machining, mcq on electron beam machining, electron beam machining questions and answers, electron beam machining objectives questions,test … Registered in England & Wales No. An electron "cloud" is generated by a superheated tungsten filament, which also acts as the cathode. As the electron strikes the workpiece, the kinetic energy of the electron changes into heat energy. This is why machining fragile and brittle materials is obtainable using this method. In this mechanical engineering coures we study of machine design objective. EmoticonEmoticon, In this mechanical engineering lecture today we learned about machine design subjects. MAGNETIC LENSES - Which shapes the electron beam and doesn't allow to deflect electrons, this lenses allow only to pass convergent electron, thus a highly focused beam is obtained, they also accept the low energy electrons thereby improving the quality of the same 3.WORKPIECE AND HOLDING DEVICE - It can machine both metallic and nonmetallic device, the workpiece is held by a … Not for hard metals c. Direct contact machining d. Capable of producing sharp corners (Ans:a) 6. The Electron beam machining (EBM) process begins after the workpiece is placed in the work chamber and a vacuum is achieved. Electron beam machining is the metal removal process by a high-velocity focussed stream of electrons which heats, melts and vaporizes the work material at the point of bombardment.. Surface finish is better and kerf width is narrower than those for other thermal cutting processes. • A magnetic deflection coil is used to make electron beam circular and to focus electron beam at a point (localized heating). Electron-beam machining (EBM) is a process where high-velocity electrons concentrated into a narrow beam that are directed towards the work piece, creating heat and vaporizing the material.EBM can be used for very precise cutting or boring of a wide variety of metals. Electron-beam welding (EBW) is a fusion welding process in which a beam of high-velocity electrons is applied to two materials to be joined. Today we study of mcq on rolling contact bearing (objecti... Mcq on electron beam machining (objectives questions and answers). The appearance of EBM equipment is very similar to electron beam welding equipment. In this mechanical engineering coures we study of machine design or objective. Electron Beam Machining can machine metallic as well as nonmetallic workpiece. Hello friends my name is Roshan Namdeo Waje and founder of mechstudy.here I shere the imforfation about mechanical engineering. c) electrolyte. The following conditions are used: cutting velocity is 180 m/min, feed is 0.20 mm/rev, … All power supply variables, such as the accelerating current, focus current, pulse duration, and others, are controlled by a CNC unit or by a microcomputer. 30990675 Howick Place | London | SW1P 1WG © 2020 Informa UK Limited. In electron beam machining (EBM) vacuum Is maintained to have proper kinetic energy of electron beam. Home >> Category >> Mechanical Engineering (MCQ) questions and answers >> Manufacturing Processes - 2 Q. The process is different from electric discharge, electron beam, laser and plasma arc machining in that the process does not depend on heating of the workpiece to the point of evaporation. In a vacuum chamber, a beam of high-velocity electrons is focused on a workpiece. The workpieces melt and flow together as the kinetic energy of the electrons is transformed into heat upon impact. Their kinetic energy is converted into heat b. Click here to navigate to parent product. Ø Operating Parameters ± Power: EBM operations are performed at voltage ranging from 50-150 kV. 160,000 km/sec.) Chemical Machining (CM) is the process where, desired amount of material is removed from the remaining portion of work surface by the application of reactive chemicals. In Electron beam machining, workpiece is held in a. vacuum chamber b. dielectric medium c. electrolyte d. none of these (Ans:a) 19. 22.16 Which one of the following processes would be appropriate to drill a hole with a square cross section, 6 mm (0.25 in) on a side and 25 mm (1 in) deep in a steel workpiece: (a) abrasive jet machining, (b) chemical milling, (c) EDM, (d) laser beam machining, (e) oxyfuel cutting, (f) … focused stream of electrons which are focused magnetically upon a very small area. Power requirements are on the order of 0.5-60 kW. This will generate high heat energy and melts and vaporize metal from work piece. Thus surface asperities and waviness influence the dissolution rate significantly. They get scattered Meaning of Electron Beam Machining (EBM): In this process, the material is removed with the help of a high velocity (travelling at half the speed of light, i.e. Electron beam machining is same as laser beam machining process in which except laser, high speed electron beam impinges on work piece. These high energy electrons possess high energy density generally in the order of 10ˆ4 kW/mm²… Answer : (A) electron beam machining Subject : Machining and Machine Tool Operations ... Orthogonal turning is performed on a cylindrical workpiece with shear strength of 250 MPa. In the process, workpiece is taken as anode and tool is taken as cathode. c) electrolyte. This article provides a description of equipment used for EBM and discusses the process characteristics, applications, advantages, and disadvantages of electron beam drilling. EBW is often performed under vacuum conditions to prevent dissipation of the electron beam. EBM is also used for microdrilling, cutting, and engraving applications. In Electron beam machining, as the electrons strikes the work piece a. In an electron beam machining the electrons strike the. The kinetic energy of the electrons, upon striking the workpiece, changes to heat, which vaporizes… The whole process takes place in vacuum. Electron beam machining (EBM) Chemical and electrochemical energies are utilized in case of Chemical Machining (CM) and Electrochemical Machining (ECM) respectively. In Electron beam machining, workpiece is held in a. vacuum chamber b. dielectric medium c. electrolyte d. none of these (Ans:a) 7. A wide range of materials, such as stainless steel, nickel and cobalt alloys, copper, aluminum, titanium, ceramics, leather, and plastics, can be successfully processed by EBM. The Electron beam machining (EBM) process begins after the workpiece is placed in the work chamber and a vacuum is achieved. A typical triode EBM gun functions in a manner very similar to an EBW gun. The appearance of EBM equipment is very similar to electron beam welding equipment. Click here to navigate to respective pages. Because EBM is a thermal machining process, some thermal effects remain on the machined edge after processing. ConversionConversion Click here to search books using title name,author name and keywords. ... Rubbing action between tool and workpiece. A typical triode EBM gun functions in a manner very similar to an EBW gun. b) dielectric medium. Electron beam machining is a thermal process used for metal removal during the machining process. In Electron beam machining, workpiece is held in. Electron beam machining (EBM) uses a focused beam of high-velocity electrons to remove material. The two electrodes workpiece and tool is immersed in an electrolyte (such as NaCl). d) none of these. Burr free b. Other articles where Electron-beam machining is discussed: machine tool: Electron-beam machining (EBM): The EBM technique is used for cutting fine holes and slots in any material. DOI link for Electron Beam Machining (EBM). a) vacuum chamber. In Electron beam machining, workpiece is held in. Electron Beam Machining is a non-conventional machining process or Non-traditional process. Electron beam machining (EBM) had been used in aerospace and nuclear industry since 1960 for welding applications. This whole process takes place in vacuum chamber. In electron beam machining workpiece is held in. please do not enter any spam link in the comment box This sputter etching mechanism is very simple. c. Direct contact machining d. Capable of producing sharp corners (Ans:a) 18. The beam current is usually between 0.1-1.0 mA. The extremely high pulse energy available with EBM explains the ability of the process to rapidly drill very deep and large-diameter holes. All kinds of weapons and equipment: guns, canon, tanks, rockets, et… Electron beam machining is process in which high velocity electrons are concentrated in a narrow beam and then directed towards the workpiece for machining. In the electrical beam machining, electrical energy is used to generate the electrons with high energy. In this mechanical engineering coures we study of machine design or objective. Electrons escapes from the hot surface and a voltage of 50 to 200 kV helps to accelerate them. As electron beam machining is grouped under the thermal category, it is natural to have thermal damages as part of the result. Breadcrumbs Section. b) dielectric medium. The Electron beam machining (EBM) process begins after the workpiece is placed in the work chamber and a vacuum is achieved. This phenomenon has been well understood since the development of electron microscopy when attempts to use the electron beam as a machining tool were made. It consists in bombarding the work with accelerated ions which collide with the surface atoms of the work. ; 2. 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 In an electron beam machining, the electrons strike the workpiece with a high velocity. In this mechanical engineering lecture today we learned about machine design subjects Mcq on electron beam welding (objectives questions and answers). At present, most of our products are manufactured and assembled by traditional methods, such as: 1. Household appliances: refrigerators, washing machines, air conditioners, etc. Traffic tools, such as cars, trains, planes, etc 3. Electrochemical Machining (ECM) Download: 15: Electrochemical Grinding , Electrostream Drilling, Shaped Tube Electrolytic Machining: Download: 16: Plasma Arc Machining (PAM) Download: 17: Electron Beam Machining (EBM) Edit Lesson: Download: 18: Laser Beam Machining (LBM) Download: 19: Chemical Machining (ChM) Download The heat energy so produced is used to melt and vaporize the materials from the w/p. Electron beam machining does not apply any cutting force on the workpiece, thus very simple work holding is required. When high-speed electrons in a densely focused beam impact with the workpiece surface, most of the kinetic energy of the electrons is converted into heat energy. The source of energy in electron beam machining is high velocity electrons, which strikes the surface of the workpiece and generate heat. Ionic dissolution rate is faster at the closest point between tool and workpiece. In Electron beam machining, as the electrons strikes the work piece a. Correct answer:a. Q 29. • The workpiece to be machined is located under the electron beam and is kept under vacuum. It is mostly used to drill holes in any shape. In the Electron Beam Machining process, a high velocity focused beam of electrons are used to remove the metal from the workpiece. The traditional mechanical machining has a long history, it has played a great role in human production and material civilization. Electron Beam Machining (EBM) Electro-Chemical Machining (ECM) ... Material removal takes place from all such points on the workpiece where the electron beam is focused. The appearance of EBM equipment is very similar to electron beam welding equipment. 2. Calculate the power required for machining of a workpiece on lathe having efficiency of 85% on full load, when tangential force required is … The workpiece is held stationary while the electron beam is programmed to cut the pattern. 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