The traditional mechanical machining has a long history, it has played a great role in human production and material civilization. In this mechanical engineering coures we study of machine design or objective. Correct answer:a. Q 29. The heat energy so produced is used to melt and vaporize the materials from the w/p. In an electron beam machining the electrons strike the. Ionic dissolution rate is faster at the closest point between tool and workpiece. In the process, workpiece is taken as anode and tool is taken as cathode. Click here to navigate to parent product. The following conditions are used: cutting velocity is 180 m/min, feed is 0.20 mm/rev, … Their kinetic energy is converted into heat b. Electron beam machining (EBM) uses a focused beam of high-velocity electrons to remove material. 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.. The source of energy in electron beam machining is high velocity electrons, which strikes the surface of the workpiece and generate heat. EmoticonEmoticon, In this mechanical engineering lecture today we learned about machine design subjects. The appearance of EBM equipment is very similar to electron beam welding equipment. They get scattered Hello friends my name is Roshan Namdeo Waje and founder of mechstudy.here I shere the imforfation about mechanical engineering. Electron beam machining is a thermal process used for metal removal during the machining process. The workpieces melt and flow together as the kinetic energy of the electrons is transformed into heat upon impact. In a vacuum chamber, a beam of high-velocity electrons is focused on a workpiece. In this mechanical engineering lecture today we learned about machine design subjects Mcq on electron beam welding (objectives questions and answers). In the electrical beam machining, electrical energy is used to generate the electrons with high energy. Electrochemical machining (ECM) is a machining process in which electrochemical process is used to remove materials from the workpiece. The two electrodes workpiece and tool is immersed in an electrolyte (such as NaCl). This article provides a description of equipment used for EBM and discusses the process characteristics, applications, advantages, and disadvantages of electron beam drilling. Electron beam machining (EBM) had been used in aerospace and nuclear industry since 1960 for welding applications. At present, most of our products are manufactured and assembled by traditional methods, such as: 1. 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 Power requirements are on the order of 0.5-60 kW. EBM is also used for microdrilling, cutting, and engraving applications. The beam current is usually between 0.1-1.0 mA. EBW is often performed under vacuum conditions to prevent dissipation of the electron beam. Because EBM is a thermal machining process, some thermal effects remain on the machined edge after processing. 160,000 km/sec.) In Electron beam machining, workpiece is held in. Breadcrumbs Section. This will generate high heat energy and melts and vaporize metal from work piece. 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. 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. This is why machining fragile and brittle materials is obtainable using this method. Electron beam machining (EBM) Chemical and electrochemical energies are utilized in case of Chemical Machining (CM) and Electrochemical Machining (ECM) respectively. 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. d) … In this mechanical engineering coures we study of machine design objective. d) none of these. Thus surface asperities and waviness influence the dissolution rate significantly. In electron beam machining workpiece is held in. Electron beam machining is same as laser beam machining process in which except laser, high speed electron beam impinges on work piece. Electron beam machining is process in which high velocity electrons are concentrated in a narrow beam and then directed towards the workpiece for machining. focused stream of electrons which are focused magnetically upon a very small area. It consists in bombarding the work with accelerated ions which collide with the surface atoms of the work. This whole process takes place in vacuum chamber. 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. ; 2. These high energy electrons possess high energy density generally in the order of 10ˆ4 kW/mm²… The workpiece is held stationary while the electron beam is programmed to cut the pattern. c) electrolyte. Today we study of  mcq on rolling  contact bearing (objecti... Mcq on electron beam machining (objectives questions and answers). c) electrolyte. 30990675 Howick Place | London | SW1P 1WG © 2020 Informa UK Limited. 2. c. Direct contact machining d. Capable of producing sharp corners (Ans:a) 18. a) vacuum chamber. Electron Beam Machining is a non-conventional machining process or Non-traditional process. b) dielectric medium. The appearance of EBM equipment is very similar to electron beam welding equipment. In an electron beam machining, the electrons strike the workpiece with a high velocity. 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. It is mostly used to drill holes in any shape. In Electron beam machining, as the electrons strikes the work piece a. In Electron beam machining, workpiece is held in a. vacuum chamber b. dielectric medium c. electrolyte d. none of these (Ans:a) 7. The Electron beam machining (EBM) process begins after the workpiece is placed in the work chamber and a vacuum is achieved. • A magnetic deflection coil is used to make electron beam circular and to focus electron beam at a point (localized heating). 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. • The workpiece to be machined is located under the electron beam and is kept under vacuum. The kinetic energy of the electrons, upon striking the workpiece, changes to heat, which vaporizes… Ø Operating Parameters ± Power: EBM operations are performed at voltage ranging from 50-150 kV. 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. In the Electron Beam Machining process, a high velocity focused beam of electrons are used to remove the metal from the workpiece. Registered in England & Wales No. A typical triode EBM gun functions in a manner very similar to an EBW gun. 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. please do not enter any spam link in the comment box 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 … 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) … 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. 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. Household appliances: refrigerators, washing machines, air conditioners, etc. Surface finish is better and kerf width is narrower than those for other thermal cutting processes. The Electron beam machining (EBM) process begins after the workpiece is placed in the work chamber and a vacuum is achieved. In Electron beam machining, workpiece is held in a. vacuum chamber b. dielectric medium c. electrolyte d. none of these (Ans:a) 19. In Electron beam machining, workpiece is held in. 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. As the electron strikes the workpiece, the kinetic energy of the electron changes into heat energy. Calculate the power required for machining of a workpiece on lathe having efficiency of 85% on full load, when tangential force required is … b) dielectric medium. Electron beam machining does not apply any cutting force on the workpiece, thus very simple work holding is required. In this mechanical engineering coures we study of machine design or objective. 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 Electrons escapes from the hot surface and a voltage of 50 to 200 kV helps to accelerate them. The Electron beam machining (EBM) process begins after the workpiece is placed in the work chamber and a vacuum is achieved. ... Rubbing action between tool and workpiece. a) vacuum chamber. Electron Beam Machining can machine metallic as well as nonmetallic workpiece. As electron beam machining is grouped under the thermal category, it is natural to have thermal damages as part of the result. This sputter etching mechanism is very simple. A typical triode EBM gun functions in a manner very similar to an EBW gun. Not for hard metals c. Direct contact machining d. Capable of producing sharp corners (Ans:a) 6. 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. Click here to search books using title name,author name and keywords. All kinds of weapons and equipment: guns, canon, tanks, rockets, et… This contains 10 Multiple Choice Questions for Mechanical Engineering Unconventional Machining Process - 3 (mcq) to study with solutions a complete question bank. ConversionConversion The appearance of EBM equipment is very similar to electron beam welding equipment. Click here to navigate to respective pages. The whole process takes place in vacuum. The extremely high pulse energy available with EBM explains the ability of the process to rapidly drill very deep and large-diameter holes. An electron "cloud" is generated by a superheated tungsten filament, which also acts as the cathode. 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 … DOI link for Electron Beam Machining (EBM). 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 Electron beam machining, as the electrons strikes the work piece a. A typical triode EBM gun functions in a manner very similar to an EBW gun. Traffic tools, such as cars, trains, planes, etc 3. 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. Burr free b. 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