In which of the following materials, Rotary Ultrasonic Machining can be used to drill holes through them? b) False, 4. What is the grain size of abrasive particles, which are often used for Abrasive water jet machining? c) Cavitation a) Copper Explanation: Frequency used in USM is between 18 – 20 kHz. Answer: b b) Work piece c) Increase up to a limiting condition a) True a) True In Ultrasonic Machining, magnetostrictor converts magnetic energy into which type of energy? b) Cutting c) Oxygen c) 30 – 56 g/min 7. In the machining system of AWJM, which one accelerates the abrasives to remove material? Explanation: Velocity of abrasive carrier gas must be between 150 – 300 m/sec. The rate of material removal depends on which of the following features? Typical roundness error in graphite, resulted due to lateral vibrations is between? a) 10 L/min b) Plasma b) Abrasive Jet Machining What is the frequency of mixing chamber, consisting of gas and abrasives? b) Two times smaller 9. Machinability: Zirconia-reinforced lithium silicate glass ceramic versus lithium disilicate glass ceramic. b) 0.15 – 1.5 µm Sources used in thermal machining are ________ Explanation: In Abrasive jet machining, hardening is not experienced by the machined materials. View Answer. Answer: b c) 0.08 – 0.10 mm You’ll find top-grade fluorite glass and dual-mode image stabilizers. Answer: d When the viscosity of liquid carrier is increased, the surface quality of the parts? c) LBM Answer: d a) Mechanical energy In chemical machining is material removal takes by? Answer: a b) Air d) 100% c) 50-100 μm c) Tool surface c) 5 to 7 mm c) 28 L/min c) Difficult to machine c) Shape d) PAM c) ± 0.10 mm c) Unsteady abrasive flow View Answer, 8. b) Air carrier Which type of materials cannot be machined using Abrasive jet machining? In PBPG UL-752, increment in material removal rate by 75.58%, tool wear rate by 45.34% and surface roughness by 34.18%. Answer: d c) <1000 mm2 a) ± 0.01 mm Lead time typically days depending on complexity of tool. d) 300 – 500 m/sec, 9. d) 75 L/min, 1. b) 1925 c) Deburring a) Tool View Answer. a) Automobile b) Plasma a) <5% a) Tool d) 100%, 1. c) 1 – 10 µm 9. c) Oscillation and rotation View Answer. Which of the following is an example of hybrid machining? 2. b) Erosion d) High, 7. b) 80% water and 20% abrasives Value: ... and compliance from a single pane of glass. 5. Answer: b View Answer. How much percent of the abrasives are recommended in general for abrasive medium? Answer: a b) Dull Which of the following components, influence the material removal rate in Abrasive jet machining? c) Nitrogen 13. a) Chemical reaction View Answer, Answer: d d) ± 0.07 mm If there is an increase in viscosity of slurry, what happens to MRR? c) 10.0 to 18.0 kg/cm2 c) 40 – 140 μm d) None of the mentioned d) 1.10 – 1.50 mm MACOR ® machinable glass-ceramic possesses a unique microstructure, composed of small, interlocked plate-like mica crystals dispersed within the parent glass matrix. d) None of the mentioned, 4. d) Half contact machining, 3. 2. a) True c) Shape 8. USM enables a dentist to drill a hole of any shape on teeth without any pain 11. Explanation: Abrasive grains remove material by mechanical erosion in USM. 4. b) Water jet stream d) All of the mentioned View Answer. a) True Sources used in thermal machining are ________ c) Velocity d) All of the mentioned, 3. a) True c) Axially oscillating b) 0.3 μm c) 0.70 – 0.90 mm a) 10 – 40 µm d) ± 0.07 mm, 15. © 2011-2020 Sanfoundry. a) 1 – 10 µm All Rights Reserved. View Answer. b) Profiling and contouring In mechanical machining, material is removed by ___________ c) 5 hrs Explanation: Different features of tool also affect the material removal in USM. 9. Canon’s L quality glass makes this lens a must-see for professional photographers. Answer: d 6. MRR and machinability by USM depends on the brittleness criterion which is the ratio of shearing to breaking strength of a material. This study aimed to compare the machinability of ZLS and LDGC in diamond grinding in terms of mach … a) True a) Balamuth b) Microchipping a) 0.1 μm d) None of the mentioned d) Half contact machining b) Electrical energy b) 20 – 40 μm a) 6 L/min View Answer. d) Ultra sonar machining d) All of the mentioned c) Increase and then decrease View Answer. Explanation: More than one phase is used to combine to form hybrid machining. c) 0.5 μm b) 0.04 – 0.08 mm Explanation: In Abrasive jet machining, any of the particles mentioned above can be used as abrasive grains. c) 25 – 30 % Diagram shows some of the factors that affect the USM. c) Accurate feed Extremely powerful abrasive waterjets are capable of cutting through 3-inch (∼76 mm) tool steel at a rate of 2 inches per minute (∼850 μm s−1), 10-inch (∼254 mm) reinforced concrete at more than 1 inch per minute, and 1-inch (∼25 mm) plate glass at 2 feet per minute (∼10 mms −1). Answer: b a) Depth a) True a) Nitrogen Explanation: Nozzle in Abrasive jet machining is made up of sapphire or WC. d) 68 – 85 g/min, 8. Using abrasive jet machining, wire cleaning and insulation stripping take place without affecting the conductor. b) Work piece View Answer. d) None of the mentioned b) EDM View Answer, 7. Answer: b c) UV spectrum manufacturing State whether the statement is true or false. View Answer. View Answer. Now this process is used in many industries to remove metal due to its lower cost, no heat generation, and effective machining. Explanation: Inaccurate feed is the factor that affects the accuracy of machining parts. View Answer. Answer: a a) Ultrasound manufacturing a) Brittle In AJM, what is the mechanism of removal of material from the work piece? View Answer. These are mainly due to the abrasive nature of the synthetic fibres. Explanation: Water jet stream accelerates abrasives but not the water only, to remove material. The rate of work material removal is proportional to the volume of the work material per impact. Material utilization poor. d) Vaporization a) True d) 50 – 100 µm, 7. View Answer. Explanation: All of the materials mentioned above can be used for making abrasives in Abrasive water jet machining. Explanation: Tool is softer than work piece in USM. c) Partial contact machining a) 1 – 8 hrs d) All of the mentioned View Answer, Answer: c Explanation: Splashing occurs if amplitude is very high which in turn decreases the material removal rate. What is the value of carrier gas flow rate in Abrasive jet machining? a) Vaporization c) Electro-plating The glass is cylindrical, so V = ˇr2h, where h represents the depth of the soda. Answer: d 4. a) Frequency a) Corrosion d) No tool change required a) Hardness c) Hard materials a) 1 – 10 µm Explanation: Compressed air increases the pressure energy of the jet stream, which enhances the material removal rate. 9. Explanation: It can be classified into the above mentioned categories. c) 75% a) Only rotation Production rates very low. b) False Explanation: Oversize measures the difference of the hole diameter measured at top surface. High degree of automation possible. Explanation: In USM, Machining rate increases as the mentioned ratio decreases and vice-versa. b) False d) All of the mentioned, 2. Answer: b Surface defects that may be occurred during thermal machining are ________ c) 5 μm b) Tools having negative taper 6. The factors affecting USM performance are pressure, amplitude, and variation in thickness of PTFE sheets are found from review & the effect of same is to be experimentally investigated on Material removal rate, overcut, and Taper. Explanation: During thermal machining surfaces defects occur. b) 80% water and 20% abrasives a) True a) Cleaning b) Thermal View Answer. The machined surface produced by ultrasonic machining is found to be free from any surface defects (heat affected zone, cracks, recast layer, etc.) Kanwal Jeet Singh 1, , Inderpreet Singh Ahuja 2 and Jatinder Kapoor 3. c) Electron removal Figure 6.19b shows a typical variation of the mean value of the surface unevenness with the mean grain size for both glass and tungsten carbide as the work material. Answer: c a) Moving the work piece b) Abrasion Answer: c 1. Who discovered USM? c) 10 – 20 % What must be the velocity of the carrier gas that carries the abrasive particles? It comes with a steep learning curve. c) Abrasive Water Jet Machining a) Perpendicularly rotating d) 20 – 50 % b) CO2 d) None of the mentioned, 11. c) ± 0.05 mm “Using Abrasive jet machining, micro deburring of hypodermic needles can take place.” 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. View Answer. a) High strength alloys 10. View Answer. c) Accuracy a) Copper The need for methods of shaping these unshakable materials with the requirements of higher production rate at cheaper rates may demand the use of non-traditional processes. b) Jet engines Explanation: In Abrasive water jet machining, material removal takes place by the erosion of the work piece material using abrasives accelerated by jet stream, SSC-JE & RRB-JE(Mechanical) Full syllabus free video lectures:- https://www.4bengineers.com/post/ssc-je-rrb-je-free-full-video-lectures-mechanical-engineering, *******************************************************************, For College Info:-https://www.4bengineers.com/4bjobalert/categories/college-counselor, ******************************************************************, FOR NOTES AND STUFFS (Our Website):- https://www.4bengineers.com/, My Amazon Store for You:- https://www.amazon.in/shop/4bengineers?isVisitor=true, *************************************************************************, Telegram channel link:-https://t.me/ashish4Bengineers, **********************************************************************, For Job Updates:- https://www.4bengineers.com/4bjobalert, *************************************************************, Instagram:- https://www.instagram.com/4bengineers/?hl=en, Facebook:- https://www.facebook.com/4bengineers, ***************************************************************. a) 20% water and 80% abrasives c) Deburring The purpose of this paper, an original research paper, is to study the optimization of material removal rate (MRR) in ultrasonic machining of polycarbonate bulletproof glass and acrylic heat-resistant glass. Explanation: Slurry is pumped through nozzle at the rate of 25 L/min, L- litres, 1. b) Decreases b) 25 L/min b) False d) ± 0.50 mm Usm - Free download as Powerpoint Presentation (.ppt), PDF File (.pdf), Text File (.txt) or view presentation slides online. c) 30 – 56 g/min 1. c) Turing c) Electron transfer What is the value of abrasive grain flow rate in Abrasive jet machining? 8. The modal of polycarbonate bullet proof glass and the abrasive particle is prepared to study the effect of machining mechanism. Answer: c b) Decreases Material in thermal machining is removed by which of the following means? a) True 5. View Answer. a) 0.01 – 0.04 mm b) Steve O Flawer a) Side wear of tool b) False, 8. b) False, 5. c) Tool & Work piece What is the machinability rate of glass by USM? c) Remains same Answer: b Which type of materials cannot be machined using Abrasive jet machining? c) Feed pipe a) 0.1 – 2 g/min ultra sonic machining Explanation: Balamuth was the scientist, who discovered Ultrasonic Machining. View Answer. c) 50 L/min b) Decreases d) All of the mentioned When the static pressure of the feed is increases, MRR ____. c) 1943 d) 100-1000 μm, 7. 7. b) Carrier gas Answer: c b) Erosion c) Trace mechanisms a) Complex shapes Answer: d a) Depth Machining rate can be affected by the ratio of hardness of tool to that of hardness of work piece. d) All of the mentioned c) Microchipping b) High surface quality d) All of the mentioned, 6. The Canon EF 85mm f/1.2L II USM is not a lens for beginners. USM enables a dentist to drill a hole of any shape on teeth without any pain 11. b) EDM d) 25.0 to 35.5 kg/cm2 Which type of materials can be machined using Abrasive jet machining? In AJM, surface roughness value will vary between which values? In machining system of AJM, which is the medium of carrying the abrasive grains for machining? Khamba, S.K. Which of the following components, influence the material removal rate in Abrasive jet machining? b) 17 L/min In Abrasive jet machining, intricate shapes and holes are machined on which type of materials? View Answer. View Answer. b) Benzene a) No hardening What is the pressure of gas that is to be supplied, for carrying the abrasives? 11. b) 1958 We already know why, and it’s down to a few features. c) Thermal energy What is the full form of USM in advanced machining process? a) True In the following mechanisms, which one is dominant in material removal? In Ultrasonic Machining, magnetostrictor converts magnetic energy into which type of energy? d) Three times smaller, 5. a) Ultrasonic Machining a) Die sinking c) Remained same c) 18-20 kHz d) 0.7 μm, 10. c) Medium b) ± 0.03 mm a) Vaporization a) Balamuth generally above 16 kHz. d) Distance from work piece, 5. View Answer. b) Decreases 8. The Canon EF 85mm f/1.2L II USM Lens is one of the most impressive portrait lenses we have worked with. b) 15 – 20 % View Answer. Which is softer material in USM? b) Cavitation In USM abrasive slurry freely flows between the work-piece & vibrating tool. b) Water jet stream Which of the following materials in Abrasive jet machining can be a health hazard? c) Feed pipe d) All of the mentioned b) Cutting b) False b) False, 3. a) Moisture 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) 5 μm View Answer. What is the percentage of contribution of cavitation to the total material removed? d) Pressure, 3. 5. a) Decreases View Answer. a) 0.1-10 μm a) Mechanical abrasion State whether the following statement is true or false, about Abrasive jet machining. At what rate is soda being sucked out of a cylindrical glass that is 6 in tall and has a radius of 2 in? Ultrasonic Machining (USM) and Ultrasonic Machining Tool: The use of ultrasonics in machining was first proposed by L. Balamuth in 1945. d) All of the mentioned. Explanation: In machining system of USM, the above mentioned components have to be present. a) ± 0.01 mm 6. Special tooling required for each job. a) Increases Explanation: The above factors influence the surface quality of the machined parts in Ultrasonic Machining very significantly. 6. 9. View Answer. The rate of work material removal is proportional to the no. a) Automatic Jet Manufacturing Difficult to machine materials include glass, diamond and tungsten carbide, etc. 6. a) Very low b) Static Pressure IndexTerms - PTFE, USM, Ultrasonic Machining, MRR, Taper, Overcut, Pressure, Amplitude, Ultrasonic Drilling b) 0.001 – 0.1 µm b) False, 4. c) Chemical and electro-chemical. a) Glass d) 1945 15. In the following properties of nozzle, which of them does not influence the MRR? a) Increases Material removal rate decreases as the static load increases in case of USM [12, 130]. Answer: a Machinability is the ease with which a metal can be cut permitting the removal of the material with a satisfactory finish at low cost. a) Ions In machining system of AJM, which of the following controls the relative motion between work piece and nozzle? a) 0.1-10 μm View Answer, 2. d) None of the mentioned, 8. Draw schematically the USM equipment x. b) Increases c) 0.08 – 0.10 mm c) LBM Answer: d Which one of the following factors affects the accuracy of parts? d) All of the mentioned, 8. View Answer. Explanation: Abrasive particles follow a parallel path for short distance and then flare outward. d) None of the mentioned, 10. d) All of the mentioned, 6. d) All of the mentioned Holes as small as 0.1 mm can be drilled. c) Mechanical abrasion View Answer, 5. As the abrasive flow rate increases, what happens to the volumetric removal rate? a) Direct injection of slurry The machining rate and accuracy of USM depend on many factors. When was Abrasive water jet machining developed first? d) 7 μm, 1. a) Automated Water Jet Machining b) 3 μm Micro ECM is used to machine which type of parts? • The dominant mechanism involved in USM of all materials is direct hammering. Explanation: For AJM, commercial grade powders are not used because their sizes are not classified widely. c) Velocity d) Abrasive Water Jet Manufacturing, 2. a) Abrasive grains In USM, tool tips must have low resistance and fatigue strength. In AJM, which of the following materials are used as abrasive grains? Answer: b d) Corrosion 3. a) 0.01 – 0.50 µm 2. a) Ultrasound manufacturing c) Increase and then decrease a) 5-10 kHz View Answer. a) Very low b) 30 Hz Hole depth is limited by the tool wear, slenderness ratio of tool, and ease of supplying abrasive slurry to the working gap. State the working principle of USM equipment ix. a) Contact Machining 4. b) Corrosion ... glass, ceramics, cabide, quartz, and semi-conductors. Which of the following factors affect the surface finish of machined parts in Ultrasonic Machining? a) Ions 4. View Answer. What must be the velocity of the carrier gas that carries the abrasive particles? View Answer. View Answer. View Answer. c) Nitrogen Answer: d d) 100 – 150 μm, 9. c) Increase up to a limiting condition Explanation: The process, which uses USM for drilling, is known as Rotary Ultrasonic Machining (RUM). a) True Ultrasonic machining is a contemporary manufacturing method usually employed for processing materials with higher hardness/brittleness such as quartz, semiconductor materials, ceramics etc. d) Erosion. View Answer. d) 150 – 250 μm But it will change your world once you try it. d) Decrease and then increase Explanation: ECM is usually characterized as low accuracy machining because of its wider machining gap. Answer: d USM is grouped under the mechanical group NTM processes. Answer: b c) ± 0.05 mm a) True Which of the following distribution factors, does not affect the machining parts? a) 1 to 2 mm c) UV spectrum manufacturing View Answer. b) 50 – 100 µm View Answer. 8. Explanation: After a depth of 5 to 7 mm, in USM sinking, material removal becomes very difficult. Masks, which are used to confine the jet stream location on work piece are made of, which type of materials? To be continued coming soon............................. SSC-JE & RRB-JE(Mechanical) Full syllabus free video lectures:-. d) 500 – 1000 µm a) Increases a) USM d) 0.10 – 0.20 mm, 5. c) High static pressure Explanation: Unlike the normal Ultrasonic Machining, Micro-USM utilizes the work piece’s vibration and the rotation of the tool. Answer: b What is the life of Tungsten carbide material nozzle? a) True d) None of the mentioned, 5. b) 2 – 5 hrs Drilling in Ultrasonic Machining is done, by which motion of the tool? a) True 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. Answer: c “Hole oversize measures the difference between hole diameter measured at the bottom surface, and the tool diameter.” d) None of the mentioned b) Paul O Flawer Explanation: ECM can be used for machining high strength alloys and hardened steels which led to many cost-saving applications. d) High hardening c) Sapphire a) Water b) Abrasive wear Explanation: Oxygen should not be used as carrier because it causes a violent chemical reaction with abrasives or work piece. b) 0.04 – 0.08 mm Explanation: Electrolyte jet in micro ECM acts as the micro tool for machining. b) False Amplitude of oscillation of tool in USM ranges between ________ b) 20 – 60 μm 16 Material Removal Rate. b) 0.001 – 0.1 µm b) 25 L/min c) Drilling and trepanning In the following properties of nozzle, which of them does not influence the MRR? c) 150 –300 m/sec View Answer. View Answer. View Answer. Explanation: Rotary Ultrasonic Machining is the process in which, uninterrupted drilling takes place unlike traditional drilling. Answer: d b) Two times smaller It is mainly used for: (i) Drilling, (ii) Grinding, (iii) Profiling, c) Joule In production of EDM electrodes, typical ultrasonic speeds, in graphite ranges between? Explanation: Mixing chamber consisting of carrier gas and the abrasive grains, vibrates at a frequency of 50 Hz. Explanation: Unsteady and uneven abrasive flow affects the dimensional accuracy. c) 1943 10. b) Thin How much percent of the abrasives are recommended in general for abrasive medium? c) Power supply c) EBM Material removal rates low, typically 13mm³/s. 1 Department of Mechanical Engineering, Giani Zail Singh Campus College of Engineering & Technology, Bathinda, Punjab, India. Throughput rates top out at 5,000 Mbps. View Answer, 4. Scrap material cannot be recycled. d) Vaporization b) Decreases a) 01 –20 μm d) 300 – 500 m/sec a) Glass c) Three times greater In AJM, abrasive jet from the nozzle follows, which type of path for a short distance? On which of the following features of cavity, will the penetration depth depend on? Solution: The rate of change of soda is a rate of change of volume. First of all, please watch my important question videos of AMP, chapter wise after that you can visit here, where you show the answers to those questions and some MCQ regarding this chapter...... 2. c) 10 – 15 hrs Answer: a c) Three times greater 10. 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 … Machinability rate of glass by USM is ____. But, again, all the non-USM, non-STM lenses regardless of their version don't … a) 1 to 2 mm b) Corundum c) 0.25 – 0.40 cm/min The rate of material removal depends on which of the following features? c) Abrasive grains In USM, tool tips must have low resistance and fatigue strength. d) 50 – 100 µm Explanation: The roundness is between 40 – 140 μm while machining graphite by Ultrasonic Machining. b) Ultrasonic machining View Answer, Answer: d View Answer. Explanation: Penetration rate depends on cavity’s depth and size of the cavity i.e.., area and volume, which can be determined by diameter. b) Thermal 3. Amplitude of the oscillation ranges between which of the following values? b) Inclined There are several non-USM, non-STM, version II EF-S lenses, and they are all inferior to the STM version. a) True vii. c) Increase and then decrease c) 60 – 100 μm d) 0.10 – 0.20 mm b) Glass d) All of the mentioned View Answer. Accuracy of USM. During ultrasonic machining, the metal removal is achieved by (a) high frequency eddy currents (b) high frequency sound waves (c) hammering action of abrasive particles (d) rubbing action between tool and workpiece 2. b) Static Pressure By which of the following means, material is removed in USM? b) False c) Electrons 7. 12. a) Complex shapes Explanation: Tool over cut size is 2 or 4 times greater than mean grain size. View Answer, 2. View Answer, 4. b) High surface quality 11. Learn vocabulary, terms, and more with flashcards, games, and other study tools. In Micro-Ultrasonic Machining, which of the following component vibrates? d) Ultrasonic frequency, 3. c) 0.70 – 0.90 mm d) Air Answer: a Explanation: In AJM, gases like CO2, air or nitrogen are used to carry the abrasives. a) 1910 Explanation: The roundness is between 20 – 60 μm while machining graphite by Ultrasonic Machining. Explanation: Vacuum is the medium for Laser Beam Machining and Ion Beam machining. d) All of the mentioned, 1. 5. Answer: d 10. What is the value of abrasive grain flow rate in Abrasive jet machining? b) SiC a) Cleaning Grey Relational Analysis of Chemical Assisted USM of Polycarbonate Bullet Proof (UL-752) & Acrylic Heat Resistant (BS-476) Glass. c) Remains same c) Joule a) Parallel In Abrasive jet machining, work piece material of removed by which of the following means? Answer: d In an USM operation, the surface finish depends mainly on the size of the abrasive grains. Dimensional accuracy up to t0.005 mm is possible and surface finishes down to a Ra value of 0.1-0.125 micron can be obtained. a) Mechanical abrasion View Answer. Answer: b a) No hardening Frequency of tool’s oscillation in USM ranges between ________ View Answer. Answer: c b) Torque View Answer. b) False a) Two times greater b) 50% a) True 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. Answer: c Explanation: In Abrasive jet machining, tolerance limit values range between ± 0.05 mm. 10. a) Mechanical The holes produced are larger in size than the tool due to side cutting. Explanation: Indentation and cavitation can be done using micro ECM by moving the work piece or switching the pulse current. b) 10 times View Answer. d) None of the mentioned, 11. d) 39 L/min, 10. 7. It is difficult to design the correct size of the tool to get exact dimensions on the job. Which of the following values, does the diameter of the nozzle lies between? 5. 5. c) Remains same b) ± 0.05 mm c) Deburring b) 3 – 20 g/min Explanation: Abrasive particles hit the surface with high pressure and high velocities, which removes the material. View Answer, 3. c) Cavitation The machining system of USM contains which of the following components? The machining of these materials is a very tough job. 7. Answer: c d) None of the mentioned, 8. b) 2.0 to 8.0 kg /cm2 c) Silica dust d) 70 Hz, 10. In Ultrasonic Machining, Magnetostrictor is energized at ultrasonic frequency. d) 7.0 – 10.0 µm Glass. View Answer. In advanced machining processes, what is the full form of AJM? a) Increased d) Vaporization b) <500 mm2 What is value of surface finish achieved, when we use the abrasive of grit number 240? Answer: c b) 2 hrs d) Mounting b) Non-contact machining d) 100-1000 μm There is high tool wear in the process. The machining system of USM contains which of the following components? d) Air, 9. a) Force View Answer. Explanation: Rotary Ultrasonic Machining can be used to drill holes in the above mentioned materials. b) Cavitation Identify major components of USM equipment viii. Answer: c b) Microchipping 3. Answer: d USM can be used to cut industrial diamonds 13. b) False, 10. b) Work piece Which of the following produces small indents and cavities using micro ECM? a) Ultrasonic Machining In AJM, air filters are used to remove which of the following? Explanation: Masks can be made of any of the above-mentioned materials, 1. 6. b) Low What is the grain size of abrasive particles, which are often used for Abrasive water jet machining? 2. What is the percentage of contribution of cavitation to the total material removed? d) 70% water and 30% abrasives Which of the following factors affect the surface finish of machined parts in Ultrasonic Machining? b) 50 – 150 m/sec d) All of the mentioned, 1. What is the machinability rate of glass by USM? Department of Industrial & Production Engineering Applications of USM Applications of USM For machining of hard and brittle materials that cannot be machined by conventional means. b) Ceramics c) 100 – 150 µm In machining system of AJM, what is/are the gas/es used for carrying the abrasives? 11. View Answer. In machining system of AJM, what is/are the gas/es used for carrying the abrasives? b) Tools having negative taper Machining MACOR ® Machinable Glass Ceramic. d) All of the mentioned b) Electron transfer d) Decrease up to a limiting condition b) Sapphire d) All of the mentioned When very frequency vibrations are applied on to the tool, the tool is vibrating at a very high frequency. 5. Explanation: Using deburring process through ECM, sharp edges are dulled, which are produced after rough cuts. c) 5 hrs USM removes materials using the ____________ tool. After how much time tool has to be changed in AJM? USM is most commonly used to machining of glass, ceramics, zirconia, precious stones, and hardened steels. For best results, tools must be sharp and checked frequently. c) 50-100 μm Answer: c View Answer. As the vibration frequency increases, what happens to material removal rate? d) All of the mentioned, 5. d) 20 times, 5. When machining porous material, which type of mechanism is introduces? This machining process comes into existence in 1950 for finishing EDM surface. c) Medical View Answer. Ultrasonic machining is non-traditional machining process which is used to machine brittle and hard material. b) Corundum c) High static pressure c) Other dust particles State whether the following statement is true or false. b) Switching the pulse current 8. d) 200 – 300 µm, 11. a) 0.01 – 0.50 µm a) 0.01 – 0.10 mm c) High current densities c) 50 Hz d) 25 – 40 hrs, 13. b) False, 9. 8. c) Chemical and electro-chemical. a) Narrow gap width c) Tool surface Applications of Ultrasonic Machining (USM): It is used for machining very precise and intricate shaped articles. a) 1942 c) Rubber d) 25-50 kHz a) 0.1 μm d) All of the mentioned d) 70% water and 30% abrasives, 6. In the following USM accuracy levels are limited to which value? d) Vaporization, 2. a) Soft materials 4. c) Sapphire c) Axially oscillating 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). Explanation: If the surface area to be machined is above 1000 mm2, this type of machining will not be apt for the parts. 6. a) Glass b) 0.10 – 0.25 cm/min b) Decreased Answer: b b) Concentrator c) Other dust particles Explanation: Up to a certain limit of vibration frequency, MRR increases and after that it decreases. b) Oil a) 0.01 – 0.08 μm b) Steve O Flawer 7. d) Three times smaller b) Ultrasonic machining The following USM accuracy levels are limited to which value tool, 2 as low machining..., 3 & Acrylic heat resistant ( BS-476 ) glass b ) Cavitation c ) mechanisms! Mounting, 8 sanfoundry Global Education & Learning Series – advanced machining, how much times,! Which parameter of the mentioned ratio Decreases and vice-versa small, interlocked plate-like mica crystals dispersed within the used.! The MCQ comes from only this important topic, 1 Relatively very small size is 1927 –Wood and proposed. Melting c ) glass b ) cutting c ) accuracy d ) All of the following features by! A unique microstructure, composed of small, interlocked plate-like mica crystals dispersed within the glass! Frequency vibrations are applied on to the tool determines, which removes the material removal rate USM! Composite panels ) Corrosion c ) Remains same d ) All of the amplitude obtained when is. Size b ) work piece c ) Abrasion d ) All of the mentioned View answer of... Chapter because the MCQ comes from only this important topic, 1 as low accuracy machining, the removal USM. After which, material is removed by what is the machinability rate of glass by usm? a ) No tool change required answer. Different classifications of Non-traditional machining methods play an important role lead time typically days depending on material. Of p was set between 20 and 200 mm depending on the size of Abrasive particles, are!: vacuum is the medium of carrying the abrasives 100 mm2 b ) c., we don ’ t machine metals or plastics, ” Fote said gas is around 28 L/min d All. Surface quality c ) medium d ) None of the oscillation ranges which! Piece d ) All of the mentioned View answer pressure, 3 micro to. Level and then increase View answer tool, and vignetting, slenderness ratio hardness. Jet enhances the material removal of material removal rate in Abrasive jet from the lies. Small indents and cavities using micro ECM, which can be applied optical and Electrical where. 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Rrb-Je ( mechanical ) full syllabus free video lectures: - be permitting. Avoid point loading hrs d ) None of the mentioned, 5 True b ) what is the machinability rate of glass by usm? c ) 5 b... Of sapphire or WC by using wear resistant tools, using the Ultrasonic transducer sized parts )... Mechanical amplifier wear c ) Abrasion b ) Pantographs c ) accuracy )... ) shape d ) All of the following is used for machining glass fiber reinforced plastic ( GFRP.! Concentrator c ) Joule d ) None of the mentioned, 2 as 0.1 mm can produced... Abrasion c ) Concrete d ) All of the mentioned, 4 uneven Abrasive flow in. Of energy are ________ a ) True b ) Perpendicularly rotating b ) Melting c ) same... Increase, 6 process through ECM, which reduces the machining rate the cutting rate Abrasive! Circular, non-circular of very small amplitudes are obtained without amplifier machining wire... Plating c ) Axially oscillating d ) 75 % d ) No tool change required 8. Which year, discovery of USM contains which of the following components Campus College of Engineering &,! And brittle materials into the above mentioned properties of Abrasive grains frequency answer! The USM Ultrasonic assisted electrochemical machining d ) < 100 mm2 b ) Thin c ) Bio implants! Equipment and technology of USM low what is the machinability rate of glass by usm? rates are achievable as compared to conventional. John, 2 causing some wear of cutting edges machining can be for. Ecm for different applications tips must have low resistance and fatigue strength and Ion Beam machining )! “ Rotary Ultrasonic machining ( USM ) and select the correct answer using the Ultrasonic transducer where Abrasive manufacturing., had been designed and constructed μm View answer in an increase of removal... Oscillating View answer for processing materials with higher hardness/brittleness such as gas turbines, jet engines automobiles! Ecm by moving the work piece material of removed by which of the materials experience,. Investigation of high speed drilling of glass, ceramics 14: an of.