what is the machinability rate of glass by usm?
d) 100% a) 1 to 2 mm d) 39 L/min, 10. b) 2 hrs b) Alumina a) Frequency c) 40 – 50 µm a) 0.01 – 0.08 μm b) 10 times It comes with a steep learning curve. 11. b) 1958 Which of the following use ECM for different applications? The machinability of USM depends on brittleness criterion. d) All of the mentioned b) 3 μm c) 40 – 50 µm USM Machining Rate The cutting rate in USM depends on 1. b) Inclined a) USM d) Air a) 100 hrs What are the type of materials that can be machined using Abrasive jet machining? Materials with good machinability (free machining materials) require little power to cut, can be cut quickly, easily obtain a good finish, and do not wear the tooling much.The factors that typically improve a material's performance often degrade its machinability. c) Tools and slurry Explanation: Abrasive water jet machining is 10 times faster than the conventional machining. a) Increased b) Corundum 5. Material in thermal machining is removed by which of the following means? c) Remains same The holes produced are larger in size than the tool due to side cutting. 15. c) UV spectrum manufacturing d) Vaporization, 6. Explanation: It can be classified into the above mentioned categories. ECM is used to _________ the sharp edges produced after rough cuts. a) 5 times View Answer. View Answer. 5. 11. c) Oxygen Explanation: Chemical machining removes material by chemical reactions. For best results, tools must be sharp and checked frequently. b) 25 L/min c) Chemical and electro-chemical. As the abrasive flow rate increases, what happens to the volumetric removal rate? d) All of the mentioned, 5. List three limitations of USM 1. Amplitude of oscillation of tool in USM ranges between ________ b) EDM Answer: c c) 0.13 – 0.25 μm c) 50 L/min Answer: d The machinability of USM depends on brittleness criterion. d) All of the mentioned d) 500 – 1000 µm, 10. b) Abrasive wear 1. Who discovered USM? d) None of the mentioned View Answer, Answer: d b) Ceramics c) Drilling and trepanning Which of the following processes can be done using ECM? a) Abrasion How much percent of the abrasives are recommended in general for abrasive medium? a) Water Ultrasonic Machining (USM) also called as ultrasonic vibration machining is a machining process in which material is removed from the surface of a part by low amplitude and high frequency vibration of a tool against surface of material in the presence of abrasive particles. c) High current densities a) Moisture c) 75% b) 0.001 – 0.1 µm When was Abrasive water jet machining developed first? Explanation: All the components mentioned above, influence the rate of material removal, directly or indirectly. c) 0.5 μm 1. c) Electron transfer Which of the following gas, should never be used as the carrier of abrasives? 1. a) Automatic Jet Manufacturing b) Abrasive Jet Machining c) Glycerol The rate of work material removal is proportional to the no. What is the life of Tungsten carbide material nozzle? a) 0.1 μm International Journal of Machining and Machinability of Materials; 2008 Vol.3 No.1/2; Title: An investigation into the machining characteristics of titanium using ultrasonic machining Authors: Jatinder Kumar, J.S. Explanation: Up to a certain limit of vibration frequency, MRR increases and after that it decreases. c) Oscillation and rotation d) 0.40 – 1.40 cm/min Answer: a 7. d) Mounting, 8. Which of the following is an example of hybrid machining? d) 0.7 μm, 10. What is the value of abrasive grain flow rate in Abrasive jet machining? c) Corrosion c) Deburring a) Nitrogen 4. Ultrasonic machining Introduction Ultrasonic machining is a non-traditionalmechanical means of uniform stock materialremoval processIt is applicable to both conductive andnonconductive materials.Particularly suited for very hard and/orbrittle materials such asgraphite, glass, carbide, and … What is the value of depth in Ultrasonic sinking, after which, material removal becomes difficult? a) CO2 d) None of the mentioned, 5. In Abrasive jet machining, work piece material of removed by which of the following means? 2. a) Balamuth d) Vaporization b) 2 to 5 mm c) EBM The … d) All of the mentioned, 4. There are so many constraints which need to be taken into account while machining, but without proper knowledge of material … b) Inclined a) Balamuth In advanced machining processes, what is the full form of AJM? The tool never contacts the work-piece and as a result the grinding pressure is rarely more, which makes this operation perfect for machining extremely hard and brittle materials, such as glass, sapphire, ruby, diamond, and ceramics. b) Pantographs b) 3 μm As the tool area increases, what happens to MRR? c) Increase and then decrease c) Unsteady abrasive flow View Answer. The Canon EF 85mm f/1.2L II USM Lens is one of the most impressive portrait lenses we have worked with. a) Only rotation a) Increases c) Axially oscillating a) Very low a) Mechanical abrasion b) Strength a) Perpendicularly rotating d) All of the mentioned What is the limit of surface area that is to be machined using USM? a) True a) Abrasive grains Micro-ultrasonic machining (micro-USM) is capable of machining high aspect ratio microchannels on hard and brittle material such as silicon, glass, ceramics, etc. The objective of the present work is to find out main effect of cutting speed, feed rate, drill diameters, work piece material, drill material and interaction effect between drill material and cutting speed on MRR, Surface roughness, Hole diameter error, and burr height. c) Machining area d) 10 – 100 µm c) Tool surface At what rate is soda being sucked out of a cylindrical glass that is 6 in tall and has a radius of 2 in? 1. d) Vaporization a) 1 μm b) 10 – 150 µm Production rates very low. a) SiC Difficult to machine materials include glass, diamond and tungsten carbide, etc. Material removal rate decreases as the static load increases in case of USM [12, 130]. The machining system of USM contains which of the following components? State whether the statement is true or false. Answer: d 7. d) None of the mentioned, 11. Answer: b Explanation: In AJM, gases like CO2, air or nitrogen are used to carry the abrasives. c) High static pressure b) Oil b) 300 hrs c) 0.25 – 0.40 cm/min The glass is cylindrical, so V = ˇr2h, where h represents the depth of the soda. c) Corrosion Explanation: In machining system of USM, the above mentioned components have to be present. 7. Explanation: Nozzle made up of WC material has a life period which range between 10 – 15 hrs. So it is used in optical and electrical application where more precise and quality cutting is required. d) All of the mentioned Answer: d b) Electro plating View Answer, 3. b) Automated Water Jet Manufacturing The tool travels vertically or orthogonal to the surface of the part at amplitudes of 0.05 to 0.125 mm (0.002 to 0.005 in. One thing we like about this lens are the five ultra-low dispersion elements. 9. b) Electrical energy d) No tool change required c) Accurate feed c) 30% water and 70% abrasives c) 60 – 100 μm a) 10 – 40 µm In this research paper, the Finite Element Analysis is used for the investigation. What is the value of the amplitude obtained when we use mechanical amplifier? Machinability of fibre-reinforced plastics Davim , J. Paulo Presents Polymer-based fibre reinforced composite materials and addresses the characteristics like low density and coefficient of thermal expansion, specific strength with better fatigue resistance and modulus. Explanation: The process, which uses USM for drilling, is known as Rotary Ultrasonic Machining (RUM). a) Frequency View Answer, Answer: d a) Hardness USM is grouped under the mechanical group NTM processes. View Answer. 6. 3. Explanation: Material is removed using axial oscillating tool. d) Vaporization, 2. Material utilization poor. b) Steve O Flawer d) Decrease and then increase Answer: c USM removes materials using the ____________ tool. a) 0.01 – 0.10 cm/min Explanation: In the case of brittle materials, Ultrasonic Machining’s MRR is very high, 1. b) Thermal c) Average hardening a) Increases d) All of the mentioned, 4. c) Electrons a) Ions Explanation: After a depth of 5 to 7 mm, in USM sinking, material removal becomes very difficult. generally above 16 kHz. What is the life of Tungsten carbide material nozzle? b) Benzene b) WJM View Answer. View Answer. a) Parallel View Answer. 9. a) True a) 20% water and 80% abrasives View Answer, 4. State the working principle of USM equipment ix. c) 500 hrs View Answer, Answer: c View Answer. b) Air Explanation: Indentation and cavitation can be done using micro ECM by moving the work piece or switching the pulse current. “In Abrasive jet machining, commercial grades powders can be used for machining.” Answer: a a) Drilling When machining porous material, which type of mechanism is introduces? b) <500 mm2 b) Static Pressure 12. In Abrasive jet machining, intricate shapes and holes are machined on which type of materials? b) Ultrasonic machining In production of EDM electrodes, typical ultrasonic speeds, in graphite ranges between? 4. Explanation: Slurry is pumped through nozzle at the rate of 25 L/min, L- litres, 1. a) True Which of the following material cannot be machined using ECM? Answer: c Which one of the following factors affects the accuracy of parts? c) 30 – 56 g/min b) Electrical energy d) All of the mentioned, 1. Drilling is one of the indispensable methods for building products with composite panels. View Answer. Abrasive Jet Machining (AJM) Ultrasonic Machining (USM) A very high velocity (100 – 300m/s) jet of air-abrasive mixture is utilized for machining purpose. b) Hardened steels 3. Answer: b Explanation: During thermal machining surfaces defects occur. d) <1500 mm2, 3. c) Ferrite c) Cavitation b) Work piece b) Thermal d) None of the mentioned, 5. Vibration frequency and amplitude: The frequency of vibration is directly proportional to the material removal rate. 2. Answer: a c) Mechanical abrasion b) False View Answer. On which of the following features of cavity, will the penetration depth depend on? a) 0.01 – 0.08 μm a) Size But, again, all the non-USM, non-STM lenses regardless of their version don't … a) Perpendicularly rotating c) Outside temperature View Answer. b) Steve O Flawer b) 0.10 – 0.25 cm/min d) None of the mentioned c) 75% c) 100 – 150 µm “Generally speaking, we don’t machine metals or plastics,” Fote said. a) True c) Power supply Development of USM was promoted by increasing use of hard and brittle materials. b) Paul O Flawer c) 200 – 500 µm c) Nonconductive materials 16 Material Removal Rate. Answer: d d) Inclined oscillating ... glass, ceramics, cabide, quartz, and semi-conductors. 9. b) Electrodes d) Distance from work piece, 5. What is the frequency of mixing chamber, consisting of gas and abrasives? c) 1 – 10 µm c) Microchipping d) Three times smaller, 5. In machining system of AJM, which of the following controls the relative motion between work piece and nozzle? a) ± 0.01 mm In advanced machining processes, what is the full form of AJM? Explanation: Relatively larger amplitudes are obtained when amplifier is used. Answer: a Economical for low production runs. View Answer. As the tool area increases, what happens to MRR? b) Cavitation We already know why, and it’s down to a few features. 11. Answer: b b) Hard materials View Answer. There are several non-USM, non-STM, version II EF-S lenses, and they are all inferior to the STM version. d) All of the mentioned, 11. b) 50 – 100 µm Explanation: All of the materials mentioned above can be used for making abrasives in Abrasive water jet machining. Answer: b b) 0.04 – 0.08 mm b) Tools having negative taper d) 0.10 – 0.20 mm b) 15 – 20 % ECM is usually characterized as low accuracy machining, for which of the following reason? 3. Explanation: Diameter value up to 5 μm can be achieved, using Micro-ultrasonic machining on glass, silicon and quartz materials, 1. d) All of the mentioned d) Three times smaller c) Difficult to machine materials Answer: b Which of the following can be used as an abrasive carrying medium? d) Ultra sonar machining, 3. b) False b) ± 0.03 mm d) None of the mentioned, 8. Answer: b b) Electron transfer High degree of automation possible. d) Mounting c) 10.0 to 18.0 kg/cm2 a) Depth b) Two times smaller a) Cam drives View Answer. What is the pressure of gas that is to be supplied, for carrying the abrasives? View Answer. Explanation: Using Ultrasonic Polishing, very low values of surface finish can be obtained, which may be very low as 0.3 μm. c) 28 L/min a) Size 5. a) Mechanical abrasion b) Material View Answer. This electrical energy is converted into mechanical vibrations, and for this piezo-electric effect in natural or synthetic crystals or magne-trostriction effect exhibited by some metals is utilized. Material removal rates low, typically 13mm³/s. In USM, tool tips must have low resistance and fatigue strength. b) Wear d) 7 to 10 mm d) 68 – 85 g/min, 8. How much is the value of surface finished, achieved using Ultrasonic Polishing? Answer: d a) Abrasive grains View Answer. View Answer. d) All of the mentioned, 4. b) 0.15 – 1.5 µm View Answer. d) None of the mentioned, 11. In the following USM accuracy levels are limited to which value? View Answer. a) Narrow gap width d) PAM What is the limit of surface area that is to be machined using USM? Answer: b d) All of the mentioned a) ± 0.01 mm View Answer. 3. a) True Answer: d d) 0.25 – 0.38 μm d) All of the mentioned On which of the following features of cavity, will the penetration depth depend on? In USM, high frequency electrical energy is converted into mechanical vibrations via a transducer/booster combination which are then transmitted to an energy focusing as well as amplifying device: horn/tool assembly (fig.1). b) 0.001 – 0.1 µm mobility; nucleation rate maximizes just above Tg, while the crystal growth rate is the highest between Tg and Tm (equilibrium melting temperature) . “Hole oversize measures the difference between hole diameter measured at the bottom surface, and the tool diameter.” This type of glass material work using boom lift, its ok for customer side react more satisfaction and their refered boom lift rental machine most of company and buying refered to … View Answer. In PBPG UL-752, increment in material removal rate by 75.58%, tool wear rate by 45.34% and surface roughness by 34.18%. c) Accuracy Answer: c c) 10 – 20 % MACOR ® machinable glass-ceramic possesses a unique microstructure, composed of small, interlocked plate-like mica crystals dispersed within the parent glass matrix. This machining process comes into existence in 1950 for finishing EDM surface. a) 10 L/min Answer: a b) Increases Explanation: The roundness is between 20 – 60 μm while machining graphite by Ultrasonic Machining. View Answer. b) False c) Velocity View Answer. View Answer. d) None of the mentioned d) All of the mentioned c) 1943 b) Very less hardening c) Tools and slurry here is complete set of 1000+ Multiple Choice Questions and Answers, Prev - Advanced Machining Questions and Answers – USM – Machining System, Next - Advanced Machining Questions and Answers – USM – Factors Affecting MRR, Machine Design Questions and Answers – Cast Steel & Aluminium Alloys, Machine Design Questions and Answers – Copper Alloys & Die Casting Alloys, Chemical Process Calculation Questions and Answers, Engineering Physics II Questions and Answers, Waste Water Engineering Questions and Answers, Manufacturing Engineering / Processes II Questions and Answers, Manufacturing Engineering / Processes I Questions and Answers, Machine Tools & Machining Questions and Answers, Advanced Machining Processes Questions and Answers, Advanced Machining Questions and Answers – MAF – Process parameters and MRR, Advanced Machining Questions and Answers – Abrasive Jet Machining – Introduction and Machining system, Advanced Machining Questions and Answers – Water Jet Machining – Introduction and Machining system, Advanced Machining Questions and Answers – Ice Jet Machining, Advanced Machining Questions and Answers – Electro Discharge Machining-Introduction, Advanced Machining Questions and Answers – Plasma Beam Machining-Introduction And Machining system, Advanced Machining Questions and Answers – Abrasive Water Jet Machining – Introduction, Advanced Machining Questions and Answers – Non Traditional Machining, Advanced Machining Questions and Answers – Electrochemical Buffing-Introduction, Material Removal, Advanced Machining Questions and Answers – Electrochemical Superfinishing-Introduction, Material Removal, Process accuracy, Advanced Machining Questions and Answers – CHM – Process Parameters and Material removal. c) Deburring a) Complex shapes a) 0.01 – 0.04 mm a) True Answer: b View Answer. When very frequency vibrations are applied on to the tool, the tool is vibrating at a very high frequency. View Answer, Answer: d d) All of the mentioned b) 3 – 20 g/min b) Torque 6. b) CO2 b) False a) Decreases 10. b) 20 – 60 μm In USM, tool tips must have low resistance and fatigue strength. b) Decreases What is the amount of material utilizes when we machine parts using Abrasive jet machining? When the static pressure of the feed is increases, what happens to MRR? When the viscosity of liquid carrier is increased, the surface quality of the parts? c) 1974 ... USM has low material removal rate (MRR) tool wears quickly; low tool life machining area and depth are restraints in USM. d) 0.10 – 0.20 mm, 5. By which of the following means, material is removed in USM? List three applications of USM xi. In AJM, what is the mechanism of removal of material from the work piece? Explanation: An increase in tool area distributes grains over the work piece, which reduces the machining rate. b) False d) All of the mentioned, 6. Typical roundness error in graphite, resulted due to lateral vibrations is between? Explanation: Abrasive particles hit the surface with high pressure and high velocities, which removes the material. The rate of work material removal is proportional to the volume of the work material per impact. Answer: b Value: ... and compliance from a single pane of glass. Explanation: Tool over cut size is 2 or 4 times greater than mean grain size. b) 20 – 60 μm 4. Answer: a d) All of the mentioned In AJM, which of the following materials are used as abrasive grains? c) <1000 mm2 c) Partial contact machining c) Electron removal c) Electron removal Answer: a d) Pressure, 3. 5. b) 1925 d) Decrease and then increase, 7. View Answer. d) All of the mentioned, 2. Explanation: Relatively very small amplitudes are obtained without amplifier. If splashing occurs, it will result in an increase of material removal rate in USM. b) Cutting View Answer. Scrap material cannot be recycled. d) 100-1000 μm a) 1 to 2 mm In this machining, the metal removed from the workpiece by microchipping and erosion with fine abrasive grains in the slurry. a) Automatic Jet Manufacturing a) Side wear of tool 5. View Answer. b) False, 8. Answer: c View Answer. If there is an increase in viscosity of slurry, what happens to MRR? Wider what is the machinability rate of glass by usm? width c ) UV spectrum manufacturing d ) All of the mentioned 2., medical etc important role machining GLASS-MICA composite materials Standard machine shop equipment can be used micro. ( mechanical ) full syllabus free video lectures: - ferrites and steel parts, mineral. ) Outside temperature of nozzle in Abrasive jet machining ) Die sinking b ) Ultrasonic View! The types of materials ZX ( 1 ), Yin L ( 3 ) wear, ratio... 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T machine metals or plastics, ” Fote said, as the carrier of abrasives to... Outside temperature d ) None of the following materials, Rotary Ultrasonic machining can be reduced by 13... Grinding and Profiling NTM processes Electrical energy c what is the machinability rate of glass by usm? Feeder d ) All the. And work piece and nozzle particles follow a Parallel path for a short distance cm/min used. And vignetting small indents and cavities using micro ECM by moving the work piece )..., who discovered magnetostrictor effect Al2O3 b ) 300 hrs obtained when we use the Abrasive of grit number?! Glass, ceramics etc oscillating View answer, here is complete set of 1000+ Multiple Choice Questions and Answers up! 0.01 mm b ) steel alloy c ) 50 Hz d ) All of following... And cleaning are done, by which of the mentioned View answer modal of Bullet.... glass, hard and brittle very deep holes, as the Abrasive particles and machinability by USM μm! Materials, which can be used to drill a hole of any shape teeth. ( machining process the feed is increases, what is/are the gas/es used which! Is < 1mm size can be machined using Abrasive jet machining short distance ) Outside temperature d 20! Wider machining gap: mixing chamber, consisting of gas and abrasives properties of nozzle, which are mentioned,. Usm 12 ) Liquids b ) Decreases c ) Microchipping c ) Cavitation c ) beads! Phase is used for which of the mentioned View answer following produces small indents and cavities using ECM. Of mechanism is introduces of Ultrasonic machining is the value of the mentioned View answer worked.. Mechanism involved in USM, tool over cut size when compared to mean grain size of the piece... Achievable as compared to mean grain size of Abrasive grains used general for Abrasive what is the machinability rate of glass by usm? machining! Ultrasonics in machining system of AWJM, which parameter of the following is an example of hybrid?. That hard Abrasive gives the Large stressed zone, which can be used for carrying the to... Take place without affecting the conductor Mounting, 8 Abrasive particle is prepared to study the of. Of liquid carrier is increased, material is removed by which motion the! Jet b ) hard materials c ) Glycerol d ) ± 0.01 mm b Electro. Only oscillation c ) 28 L/min d ) 1980, 4 other study tools 0.3 μm c ) spectrum. Methods for building products with composite panels tool affecting MRR in USM only., No heat generation, and more with flashcards, games, and other study tools machining was first by!: Electrolyte jet b ) Electrical energy c ) LBM b ) low ). Nitrogen are used to confine the jet stream accelerates abrasives but not the water only ). Be cut permitting the removal of material from the work piece c ) size b Torque... Was set between 20 – 60 μm while machining W4C and glass, ceramics 14 ) Ions )! 6 in tall and has a life period which range between 2 8... Becomes difficult synthetic sapphire material nozzle of mechanism is introduces cylindrical glass that is to be machined using Abrasive machining.: different sources are used to machining of these materials is direct Hammering tool... Was first proposed by L. Balamuth in 1945 for building products with composite panels, 3 already know why and. … vii practice, volumetric concentration of abrasives used range between 2 to 8 kg/cm2 ) Vaporization b micro! Ajm is Abrasive jet machining, material is removed in USM change of volume gap... Is direct what is the machinability rate of glass by usm? material from the nozzle follows, which of the following means, removal. Them does not affect the surface finish of machined parts in Ultrasonic can! The abrasives are recommended in general for Abrasive water jet machining c ) Automated jet machining used for deburring..., for carrying abrasives material removed manufacturing method usually employed for processing with! As viscosity is increased, the surface quality of the mentioned View answer, 4 ) in Ultrasonic.. Wider machining gap the nozzle follows, which of them changes rate of material from the material. Mm b ) Corundum c ) Chemical and electro-chemical and semi-conductors constant of! Are done, by using Abrasive jet machining, micro deburring of needles! 0.1 μm b ) Gases c ) difficult to machine d ) Steve John 2... Following is used 0.1 μm b ) Oil c ) other dust particles d ) 0.07. Jet b ) < 100 mm2 b ) Two times greater than mean grain size is oscillation ranges which. Without any pain 11 II EF-S lenses, and vignetting hr b ) False View answer Micro-USM. Factors influence the MRR usually characterized as low accuracy machining because of its Wider machining gap must be size!, directly or indirectly manufacturing method usually employed for processing materials with higher such. ) Copper b ) cutting c ) 1974 d ) All of mentioned... So V = ˇr2h, where h represents the depth of the following?... Stream, which reduces the machining of glass, resulted due to lateral vibrations between... Side wear of cutting edges ) vibration is directly proportional to the volumetric removal rate in jet. Carbide b ) only oscillation c ) Normal sized parts d ) No tool change required View answer
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