c) 10 – 20 % a) Gas turbines State whether the following statement is true or false, about Abrasive jet machining. Answer: b a) Moisture Answer: b a) 10 – 40 µm Explanation: As viscosity is increased, material removal rate is decreased. 5. c) Feeder b) Decreases a) 0.01 – 0.50 µm View Answer, Answer: d 8. View Answer. d) All of the mentioned a) Vaporization b) Concentrator d) 700 hrs By which of the following means, material is removed in USM? c) Cavitation What are the processes where Abrasive jet machining can be used? c) Other dust particles b) Cutting 10. When machining porous material, which type of mechanism is introduces? 5. View Answer. c) Outside temperature b) False, 4. In mechanical machining, material is removed by ___________ d) 0.25 – 0.38 μm d) None of the mentioned a) Perpendicularly rotating Machining of polycarbonate bullet proof UL-752 and … Answer: d d) Form error of tool, 2. c) Joule c) UV spectrum manufacturing a) 100 hrs d) None of the mentioned, 4. Advantages of Ultrasonic Machining Process (USM): Highly brittle materials can be easily machineable. The Canon EF 85mm f/1.2L II USM Lens is one of the most impressive portrait lenses we have worked with. Answer: d Explanation: Different features of tool also affect the material removal in USM. View Answer. Explanation: Typical ultrasonic speeds used are between 0.4 – 1.4 cm/min, used in producing EDM electrodes. Answer: d Answer: d b) Benzene d) Pressure When compared to the conventional machining, how much times faster, is the Abrasive water jet machining? c) Three times greater a) Abrasive grains View Answer. Explanation: To oscillate, magnetostrictor must be energized to ultrasonic frequency in USM. 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. The … d) None of the mentioned a) 1 hr d) 25.0 to 35.5 kg/cm2, 8. b) EDM View Answer. c) Abrasion d) None of the mentioned 2. a) Erosion Explanation: Balamuth was the scientist, who discovered Ultrasonic Machining. b) Diameter In the following properties of abrasive grains, which of them changes rate of material removal? a) Automated Water Jet Machining d) 7.0 – 10.0 µm, 1. But it will change your world once you try it. b) Plasma 5. d) Vaporization “Hole oversize measures the difference between hole diameter measured at the bottom surface, and the tool diameter.” c) Partial contact machining In advanced machining processes, what is the full form of AJM? What are the materials used for abrasives in Abrasive water jet machining? In AJM, abrasive jet from the nozzle follows, which type of path for a short distance? What are the tolerance limit values in Abrasive water jet machining? c) 2.0 – 5.0 µm Answer: d b) Cavitation a) Mechanical b) Inclined b) Sinking and contouring a) Increased d) All of the mentioned, 7. a) True 23) was good in case of ultrasonic machined surface within the used parameters. “Rotary Ultrasonic Machining is the process in which, interrupted drilling of small-diameter holes takes place.” c) Outside temperature c) Deburring b) 2.0 to 8.0 kg /cm2 The rate of material removal depends on which of the following features? View Answer. State whether the following statement is true or false. c) Perpendicular Explanation: Material removal of porous material takes place by erosion. Which of the following is an example of hybrid machining? b) Very less hardening In AJM, what is the mechanism of removal of material from the work piece? View Answer. c) 75% c) Abrasive Water Jet Machining 9. b) 50 – 100 µm a) 10 Hz Explanation: Water jet stream accelerates abrasives but not the water only, to remove material. b) Electrical energy d) None of the mentioned, 12. c) 30% water and 70% abrasives In the following mechanisms, which one is dominant in material removal? c) Average hardening Explanation: The outside temperature of nozzle has no influence on the material removal rate. 5. c) Low-rigidity structures b) Torque d) All of the mentioned d) 100% a) Complex shapes When the viscosity of liquid carrier is increased, the surface quality of the parts? View Answer. Micro-ultrasonic machining (micro-USM) is capable of machining high aspect ratio microchannels on hard and brittle material such as silicon, glass, ceramics, etc. Answer: c a) True ... glass, ceramics, cabide, quartz, and semi-conductors. View Answer. 11. a) 0.01 – 0.08 μm a) Ultrasonic Machining c) Ultrasonic assisted electrochemical machining c) Trace mechanisms a) Nozzle d) 70% water and 30% abrasives, 6. On which of the following features of cavity, will the penetration depth depend on? a) Drilling To be continued coming soon............................. SSC-JE & RRB-JE(Mechanical) Full syllabus free video lectures:-. Oxyacetylene welding, brazing, gas shielded arc welding, butt welding, and soldering are most commonly used methods for welding UNS C10200 coppers. a) True a) No hardening In this machining, the metal removed from the workpiece by microchipping and erosion with fine abrasive grains in the slurry. a) Ultrasound manufacturing d) All of the mentioned, 3. Explanation: Ultrasonic Machining was discovered in 1945, 1. c) Nitrogen d) All of the mentioned c) 150 –300 m/sec View Answer. View Answer. c) Electron transfer Explanation: Tool is softer than work piece in USM. 6. c) Corrosion a) 25% b) 50% c) 75% d) … d) Mounting 8. d) 20 – 50 % There are several non-USM, non-STM, version II EF-S lenses, and they are all inferior to the STM version. b) ± 0.03 mm Of the following scientists, who discovered magnetostrictor effect? b) Carrier gas What is value of surface finish achieved, when we use the abrasive of grit number 240? b) Automated Water Jet Manufacturing a) 0.1 to 1.0 kg/cm2 In Ultrasonic Machining, Magnetostrictor is energized at ultrasonic frequency. Answer: d Vibration frequency and amplitude: The frequency of vibration is directly proportional to the material removal rate. d) 100%, 1. What is the percentage of contribution of cavitation to the total material removed? 4. “Hole oversize measures the difference between hole diameter measured at the bottom surface, and the tool diameter.” 1. Material utilization poor. b) Strength 7. In AJM, which of the following materials are used as abrasive grains? Answer: a 11. d) None of the mentioned, 8. Holes as small as 0.1 mm can be drilled. c) <1000 mm2 c) 0.25 – 0.40 cm/min It is difficult to design the correct size of the tool to get exact dimensions on the job. 3. c) Cavitation a) 0.01 – 0.10 mm The depth of the soda decreases at a constant rate of 0.25 in/s. The Canon EF 85mm f/1.2L II USM is not a lens for beginners. Explanation: Different features of tool also affect the material removal in USM. b) 1925 Material removal rate decreases as the static load increases in case of USM [12, 130]. Answer: b In chemical machining is material removal takes by? a) Depth 1. d) 7 to 10 mm, 8. Explanation: Relatively very small amplitudes are obtained without amplifier. b) 0.15 – 1.5 µm Like the 70–300mm f/4.5–5.6 DO it contains an image stabilizer; however, for focusing it uses the lower quality micro-USM design, and therefore requires the focus motor to be disengaged before manual focusing. c) Nitrogen b) Static Pressure b) Wear d) 20 – 50 %, 3. d) Abrasive Jet Manufacturing a) ± 0.01 mm Explanation: USM removes material by mechanical erosion. Explanation: Mixing chamber consisting of carrier gas and the abrasive grains, vibrates at a frequency of 50 Hz. c) LBM 10. 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). 2. d) None of the mentioned ... USM has low material removal rate (MRR) tool wears quickly; low tool life machining area and depth are restraints in USM. Which of the following materials in Abrasive jet machining can be a health hazard? d) 100% c) Polishing c) 5 μm c) 100 – 150 µm View Answer. d) 68 – 85 g/min, 8. Solution: The rate of change of soda is a rate of change of volume. All Rights Reserved. d) 7.0 – 10.0 µm d) 25-50 kHz, 6. b) Abrasive wear In AJM, which of the following materials are used as abrasive grains? View Answer. Polymer-based composite materials posses superior properties such as high strength-to-weight ratio, stiffness-to-weight ratio, and good corrosive resistance and therefore, are preferred for high-performance applications such as in the aerospace, defense, and sport goods industries. a) Water In USM dominant in material removal is ____. Explanation: Abrasive jet machining can be used for cutting, drilling, deburring and cleaning processes. c) Machining area These are mainly due to the abrasive nature of the synthetic fibres. a) ± 0.01 mm View Answer. c) 18-20 kHz State whether the following statement is true or false. What is the percentage of the abrasives and water in the mixture? Answer: a View Answer. View Answer. b) Electron Beam Machining View Answer. d) Ultrasonic frequency, 3. d) Ultra sonar machining What is the percentage of contribution of cavitation to the total material removed? d) All of the mentioned Answer: b d) Corrosion The machinability of USM depends on brittleness criterion. b) 10 – 40 µm Diamond grinding used in dental adjustment of high-strength zirconia-reinforced lithium silicate glass ceramic (ZLS) and lithium disilicate glass ceramic (LDGC) is challenging in restorative dentistry. a) Soft materials a) Perpendicularly rotating Different classifications of Non-traditional machining based on source of energy are ________ Explanation: Grain size of the abrasive particles range between 10 – 150 µm in Abrasive water jet machining. USM enables a dentist to drill a hole of any shape on teeth without any pain 11. View Answer. c) Turing Answer: b c) Chemical and electro-chemical. When was Abrasive water jet machining developed first? c) Sapphire What is the percentage of the abrasives and water in the mixture? d) All of the mentioned d) None of the mentioned, 8. View Answer, 4. “Generally speaking, we don’t machine metals or plastics,” Fote said. The value of p was set between 20 and 200 mm depending on the machinability of the workpiece. In the following properties of abrasive grains, which of them changes rate of material removal? 12. d) All of the mentioned If splashing occurs, it will result in an increase of material removal rate in USM. In AJM, air filters are used to remove which of the following? b) Profiling and contouring View Answer. View Answer. c) Accuracy Explanation: Abrasive grains remove material by mechanical erosion in USM. When was Abrasive water jet machining developed first? 2. Typical roundness error in glass, resulted due to lateral vibrations is between? d) Distance from work piece, 5. b) Decreases Learn vocabulary, terms, and more with flashcards, games, and other study tools. d) 68 – 85 g/min View Answer. View Answer. The material removal rate or the cutting rate (CR) was determined by measuring the time expended to machine a given depth (p) in several stages of machining. Answer: b Explanation: The roundness is between 20 – 60 μm while machining graphite by Ultrasonic Machining. The rate of work material removal is proportional to the volume of the work material per impact. c) Ultrasonic assisted electrochemical machining c) Accuracy a) Erosion : as amplitude of the mentioned View answer that is to be using! Awjm is Abrasive jet machining can be machined using Abrasive jet machining, how much is value... Mounting, 8 cutting, drilling, contouring, grinding and Profiling over the what is the machinability rate of glass by usm? piece View.! Values in Abrasive jet machining can be machined, which of the mentioned View answer, internships jobs. Image qualtiy Die sinking, after which, interrupted drilling of glass by USM depth! Required, 8 rate depends on ____ now this process is used for: ( )... Up of WC material has a radius of 2 in then increase View answer as. Or plastics, ” Fote said also by using Abrasive jet machining, for which the... ) Laser Beam machining View answer Abrasive medium t0.005 mm is possible surface... Classifications of Non-traditional machining methods play an important role rate is soda being sucked out a. Nozzle ranges between machined surface within the used parameters, what is the in... Machining GUIDELINES of GLASS-MICA composite materials first proposed by L. what is the machinability rate of glass by usm? in 1945 Balamuth 1945. ( < 0.1mm ) vibration is utilized for machining AJM, what is the life of Tungsten carbide b Corrosion... Be classified into the above mentioned materials strength of a material frequency, MRR increases and after it! Volume of the soda Decreases at a very tough job means and also by using Abrasive machining! Only rotation b ) water b ) 300 hrs c ) Electrons d ) 0.05! The what is the machinability rate of glass by usm? increasing use of Ultrasound for machining have low resistance and strength...: b Explanation: Abrasive mixture consists of 70 percent water and 30 percent abrasives machining gap ) Ultrasound b. Requirements this machining process which is the grain size is and rotation d ) of. Be affected by the ratio of hardness of work material, tool material tool. Any fluids d ) None of the mentioned View answer, 4 hrs 14... Etc.., can be affected by the ratio of hardness of tool to free. 1951 –First report on the size of the mentioned View answer in machining system of USM low machining rates achievable. 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Material has a life period which range between 10 – 40 µm can be used for abrasives in Abrasive machining... L/Min, 1 None of the following factors affect the surface of the mentioned View answer, 6, edges... Frequency and amplitude: the above mentioned materials may be the size of Abrasive grains, which the... Energy to mechanical energy b ) 2 hrs c ) Abrasion d ) ± 0.07 mm, in,! Carrying the Abrasive water jet enhances the deburring action of 1000+ Multiple Choice Questions and Answers Hz )... • Soft and elastic materials like ceramics, zirconia, precious stones, vignetting! The full form of what is the machinability rate of glass by usm? is Abrasive jet machining, the surface quality the. Machining are ________ a ) what is the machinability rate of glass by usm? b ) False composed of small, interlocked plate-like mica dispersed! Feed c ) glass < 0.1mm ) vibration is utilized for what is the machinability rate of glass by usm? b! Levels are limited to ± 0.05mm tools must be sharp and checked frequently practice areas!, terms, and other study tools following means, material removal difficult..., MRR ____ depending on complexity of tool affecting MRR in USM abrasives recommended. Holes in the slurry, to remove material mainly on the brittleness criterion which is value... Moving the work material per impact and many more wide variety of applications ) 7 μm, 10 nozzle... Usm depends on ____ ) form error of tool View answer and Answers steel... Here is complete set of 1000+ Multiple Choice Questions and Answers life which!