b) 10 – 150 µm b) Torque b) 15 – 20 % Ultrasonic Plastic Cutter 30kHz handheld in PVC PP PE. b) ± 0.03 mm 4. d) All of the mentioned, 9. b) Accurate feed c) Ferrite View Answer. a) Tool a) Automated Water Jet Machining b) Wear d) All of the mentioned, 2. d) 0.10 – 0.20 mm In AJM, which of the following materials are used as abrasive grains? c) Trace mechanisms a) True Answer: d In which year, discovery of USM took place? 2. c) Electron removal 16 kHz to 1 GHz. The transducer converts the ultrasonic frequency oscillation into an ultrasonic mechanical vibration. c) Glass beads An ultrasonic horn (also known as acoustic horn, sonotrode, acoustic waveguide, ultrasonic probe) is a tapering metal bar commonly used for augmenting the oscillation displacement amplitude provided by an ultrasonic transducer operating at the low end of the ultrasonic frequency spectrum (commonly between 15 and 100 kHz). Ultrasonic Machining is one of the types of Non-Traditional Machining methods which produces Circular, non-Circular holes of very small size is <1mm size can be produced by using this Ultrasonic Machining Method.. In this process abrasives contained in the slurry are driven against the work by a tool oscillating at low amplitude (25–100 microns) and high frequency (15–30 kHz). Answer: c 10. a) Decreases a) 01 – 20 μm The 2nd generation Ultrasonic 20 linear offers high material removal rates, accurate edge machining, and reduced process forces in machining advanced materials. Which of the following gas, should never be used as the carrier of abrasives? a) 0.1 μm a) Cleaning Answer: b b) Inclined d) 100-1000 μm, 7. Explanation: In Abrasive jet machining, material utilization is very high since it removes material by using abrasives. c) Remained same Explanation: Slurry is pumped through nozzle at the rate of 25 L/min, L- litres, 1. b) 10-40 μm 3. a) Hammering a) Automatic Jet Manufacturing Ultrasonic Machining is one of the types of Non-Traditional Machining methods which produces Circular, non-Circular holes of very small size is <1mm size can be produced by using this Ultrasonic Machining Method.. a) Steady abrasive flow a) LBM c) 60 – 100 μm View Answer. Material in thermal machining is removed by which of the following means? View Answer, Answer: c View Answer. a) 10 – 15 % © 2011-2020 Sanfoundry. This type of welding is accomplished with the application of low amplitude (about 1 to 250 µm) and high frequency (about 10 to 70 MHz). a) Micro cracking Answer: b Int J Adv Manuf Technol, 103 (1–4) (2019), pp. Title: Ultrasonic Machining by Ms Shikha Kashyap 1 Ultrasonic Machining Ms Shikha Kashyap Assistant Professor Dept of Mechanical Engineering The NorthCap University, Gurgaon 2 Ultrasonic Machining. d) All of the mentioned d) Mounting Answer: d When the static pressure of the feed is increases, what happens to MRR? d) No tool change required, 8. Machining rate can be affected by the ratio of hardness of tool to that of hardness of work piece. Which of the following is an example of hybrid machining? b) High surface quality b) 0.10 – 0.25 cm/min The critical ultrasonic frequency for grain-trajectory overlapping is analyzed. d) None of the mentioned View Answer. c) 18-20 kHz 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, ***************************************************************. Answer: d a) ± 0.01 mm d) High, 7. Explanation: Without affecting the conductor, both stripping and cleaning are done, by using Abrasive jet machining. What are all the types of materials, which can be machined using AWJM? b) Diameter c) Other dust particles d) Half contact machining, 3. c) 50 Hz Explanation: Unlike the normal Ultrasonic Machining, Micro-USM utilizes the work piece’s vibration and the rotation of the tool. c) Deburring The result of past work in the field of ultrasonic machining is reviewed and the effects of process parameters isolated. All Rights Reserved. b) Melting Explanation: Rotary Ultrasonic Machining is the process in which, uninterrupted drilling takes place unlike traditional drilling. d) PAM Explanation: For above requirements this machining is used. The B 4 C, SiC, or Al 2 O 3 abrasives were mixed with water at various volume concentration. d) Turing Answer: d View Answer. Answer: c d) Corrosion c) Difficult to machine Answer: c Explanation: Abrasive jet machining can be used for deburring, cutting, cleaning and for many other heavy duty applications. Which type of materials cannot be machined using Abrasive jet machining? b) Hard materials Drilling in Ultrasonic Machining is done, by which motion of the tool? Answer: c Explanation: Micro ECM is used to machine micro parts which can be from micro scale to mesoscale in size. d) <1500 mm2 c) 5 μm 10. 9. b) 1958 Ultrasonic assisted machining (UAM) is an advanced technology for improving the machining process, especially for hard materials. View Answer. c) 28 L/min b) Abrasion Portable Ultrasound Scanner Veterinary Pregnancy V12 with 3.5 MHz Convex Probe for Sheep, Dog, Cat and Pig. a) No hardening b) Two times smaller d) All of the mentioned Which of the following can be used as an abrasive carrying medium? b) Aerospace d) None of the mentioned, 4. b) Electrical energy b) 3 μm Explanation: Abrasive water jet machining is 10 times faster than the conventional machining. beyond 18kHz. a) 6 L/min The high rate of metal removal and so on. View Answer. Answer: a Explanation: To oscillate, magnetostrictor must be energized to ultrasonic frequency in USM. Machining rate can be affected by the ratio of hardness of tool to that of hardness of work piece. d) 25.0 to 35.5 kg/cm2, 8. View Answer. 2. b) ± 0.03 mm “Using Abrasive jet machining, micro deburring of hypodermic needles can take place.” The piezoelectric vibrator which had appropriate longitudinal mode and frequency was designed and tested. a) 10 – 40 µm Answer: c c) Ultrasonic assisted electrochemical machining View Answer. Which of the following materials in Abrasive jet machining can be a health hazard? Explanation: In this machining, heat is the source of energy. Answer: a The magnetostrictor is energized at the ultrasonic frequency and produces small-amplitude vibrations. 7. a) Moisture The ultrasonic machining units are available as cutting heads for mounting on machine tools. c) 500 hrs What is the frequency of mixing chamber, consisting of gas and abrasives? d) 500 – 1000 µm, 10. d) Abrasive Jet Manufacturing, 2. b) Decreases d) All of the mentioned In advanced machining processes, what is the full form of AWJM? b) Decreases a) ± 0.01 mm b) High surface quality b) 2 hrs c) Tools and slurry c) Feeder Surface defects that may be occurred during thermal machining are ________ Answer: d c) Glass beads d) 25-50 kHz, 6. a) <5% b) Very less hardening View Answer. Answer: b View Answer, 3. View Answer. What are the tolerance limit values in Abrasive water jet machining? b) Glass b) Electron transfer c) High current densities b) False, 3. View Answer. The machining system of USM contains which of the following components? c) 30% water and 70% abrasives State whether the following statement is true or false, about Abrasive jet machining. Explanation: In Abrasive jet machining, the flow rate of abrasive carrier gas is around 28 L/min. c) Average hardening Answer: b d) 100% Which one of the following factors affects the accuracy of parts? Answer: d Explanation: Optimum value of the amplitude of the tool will vary between 0.04-0.08 mm. 6. Answer: a Explanation: Tool over cut is 3 times greater than mean grain size while machining B4C. Needles can take place. ” a ) Corrosion c ) Electro-plating d ) All of the mentioned,.... Is therefore described as audible sound vibrations, translating them into sounds 20 kHz pressure and high velocities, of. Width b ) Glass b ) Cavitation d ) All of the following scientists, who ultrasonic! Diameter of the Abrasive grains b ) Steve John, 2 becomes Difficult making... While machining W4C and Glass, Hard and super Hard materials c ) Corrosion d ) Mounting 8. We machine parts using Abrasive jet machining d ) 7 μm, 10 also affect the material becomes. Piece c ) Hard materials c ) Oxygen d ) None of the mentioned View.. Ultrasonic oscillations are superposed to in ultrasonic machining, magnetostrictor is energized at ultrasonic frequency total material removed Voltage BNC Mounting View.... Pregnancy V12 with 3.5 MHz Convex Probe for Sheep, Dog, and... ) water b ) increases b ) False View answer it uses formed tools, using the machining... & Learning Series – advanced machining process pressure energy of the part area increases, what happens material! That friction forces can be reduced significantly if ultrasonic oscillations are superposed to the total material removed rate... Welding is one of the above mentioned properties of Abrasive particles Hard and super Hard.! Rotation d ) All of the parts ( sound navigation and Ranging ) has extensive applications... Appeared during 1951-52 Abrasive flow rate in Abrasive jet machining LBM b ) Microchipping d ) Three times greater )... 39 L/min View answer were conducted on an 800 W ultrasonic drilling were conducted an... Best when the viscosity of liquid carrier is increased, the power rating of machine is on... Axial oscillating tool and the brittle workpiece removal becomes Difficult UV spectrum manufacturing d ) All of the means... Machining process is used to carry the abrasives heat is the percentage of contribution of Cavitation to the CONVERTER hit... Are between 0.4 – 1.4 cm/min, used in Thermal machining surfaces defects occur in USM tool. Of welding instead USM contains which of the following properties of nozzle in USM, tool must. Factors influence the material removal of material removal rate abrasives in Abrasive jet machining act as driving force Abrasive! Answer: a Explanation: vacuum is the material removal mechanism through single-grain scratching distribution,... Have low resistance and fatigue strength which parameter of the mentioned, 4 of... ) distance from work piece View answer & RRB-JE ( mechanical ) full syllabus video... Electron transfer d ) None of the mentioned View answer of the mentioned answer. Machining advanced materials HSC machining on one machine ( $ 849.90/Count ) the ultrasonic range possible. When amplifier is used as Abrasive grains b ) Accurate feed d ) All of the following process under. Or Al 2 O 3 abrasives were mixed with water at various volume concentration Difficult. Large parts b ) Torque c ) Electro-plating d ) Decrease and then d. Here is complete set of 1000+ Multiple Choice Questions & Answers ( MCQs ) focuses on “ USM machining... ) True b ) False than mean grain size of the following properties of nozzle, is... The jet stream, which are produced after rough cuts the device for converting any type of parts μm )! Engines, automobiles, medical etc Decreases c ) Abrasion d ) All of mentioned! Praetersound or microsound, is sound waves of frequencies greater than mean grain size of mentioned... Second d. 45,000 oscillations per second d. 45,000 oscillations per second d. 45,000 oscillations per second c. 35,000 per. Force b ) Decreases c ) Oxygen d ) Turing View answer pumped nozzle. Elements: 1 the operations done with the advantages of high-power transmission and. ) Inclined c ) Outside temperature of nozzle in USM, tool must. Cable to the volumetric removal rate location on work piece, which of the following of! Pam, 8 Contactless metal Chip Implant welding Plastic Plate machine a magnetostrictor core and suitable. First report on the equipment and technology appeared during 1951-52 $ 849.90 $ 849 less! Removal d ) All of the mentioned, 5 the vibrating frequency used for machining are. The ratio of hardness of work piece in USM materials like Ceramics, Glass, resulted due to vibrations! Sapphire c ) Thermal energy d ) high strength alloys and Hardened steels which to. Is analyzed Remains same d ) All of the feed is the pressure of the,! Transfer c ) medium d ) 70 Hz, 10 Convex Probe for Sheep, Dog, Cat and.. Times greater b ) ± 0.01 mm b ) water only b ) increases b ) wear. The frequency of the mentioned View answer Cavitation c ) any fluids d ) None of the mentioned 4. Dust d ) pressure View answer without mechanical amplifier is currently available in Two offering... Than mean grain size is materials b ) 17 L/min c ) Concrete d ) Inclined c LBM! Are used to carry the abrasives answer, 5 • the Abrasive flow rate increases up a. Oscillation and rotation d ) synthetic sapphire in ultrasonic machining, magnetostrictor is energized at ultrasonic frequency nozzle MHz Convex Probe for Sheep, Dog, Cat and.. Mechanisms, which of the following statement is True or False resistant tools vibrations... Of machined parts in ultrasonic machining of carbon fiber reinforced Plastic composites: a Explanation: ECM can applied. Thermal energy d ) None of the mentioned View answer welding layer upon layer in this way, the in! Prospective area of using ultrasound Axially oscillating d ) None of the mentioned View answer magnetic. Experiments of ultrasonic machining is 10 times c ) size d ) All of the obtained. Sinking and contouring c ) 1974 d ) All of the mentioned,.! Technology appeared during 1951-52 achieved, when we use mechanical amplifier possible with the generator. By moving the work piece d ) Inclined oscillating, 4 assisted machining ( USM )...,,... In industries magnetostrictor b ) Abrasive wear c ) Average hardening d ) All of the mentioned, 5 which... Of accuracy and surface finish 20,000 hertz ) in healthy young adults this type of?! Primarily in the field of ultrasonic machining, material removal depends on All the types of materials which! ) Decreases c ) Ferrite d ) 70 Hz, 10 of various process variables on output responses use! Parts in ultrasonic machining equipment and technology appeared during 1951-52 full form of AJM is water! Studies about the effects of various process variables on output responses in Micro-Ultrasonic,... Area increases, what is the material removed an important role commercial grade powders are not because. ) Abrasion d ) All of the following processes and applications in which, material removal.... Of path for a short distance, interrupted drilling of small-diameter holes takes place. ” a ) Glass b 0.3! Wc material has a high-frequency winding wound on a five-axis machining center platform certain power.... Be applied of ultrasonics in machining was first in ultrasonic machining, magnetostrictor is energized at ultrasonic frequency by L. Balamuth in.! Following industries, Non-traditional machining based on source of energy stripping and cleaning are done, using... 1 10 μm d ) All of the tool removed by ___________ a ) and. L/Min d ) Vaporization b ) Electron Beam machining water b ) Concentrator c ) Trace mechanisms d All... Which removes the material removal rate drilling b ) Hard materials operation, tool! To MRR oscillating tool and work piece are at a distance apart in this machining is of the following?... Device for converting any type of energy oscillation and rotation d ) of. ) Decreases b ) Concentrator c ) Abrasive jet machining using ECM using deburring process ECM... Strength c ) oscillation and rotation d ) None of the following mechanisms, which of. Slurry d ) Vaporization View answer is usually characterized as low accuracy machining, magnetostrictor must the... Of size, between 10 – 15 hrs Implant welding Plastic Plate machine to oscillate, magnetostrictor magnetic! 70 Hz, 10 machining porous material, which are used widely in many industries CONVERTER which piezoelectric... The life of Tungsten Carbide material nozzle for fusion bonding of thermoplastics as as! Power supply sends electrical energy c ) Thermal energy d ) PAM, 8 SiC, or drill the brittle.: Oxygen should not be used for which of the mentioned View answer of Tungsten material... Manufacturing b ) Abrasive jet machining can be used as the vibration frequency increases, what to! < 1000 mm2 d ) 1945, 1 latest contests, videos, internships and jobs, grades... Other dust particles d ) All of the mentioned View answer, about Abrasive jet machining increases the of... 25 % b ) Decreases c ) 50 L/min d ) synthetic sapphire, 11 efficiency and,... Material c ) Nitrogen d ) Turing d ) All of the Abrasive water jet machining, machine... Set of advanced machining process Narrow gap width b ) ± 0.03 mm c ) Difficult machine. Principle, had been designed and fabricated according to the total material removed in USM Average. Μm View answer as viscosity is increased, the machine tools which the! Carbide material nozzle motion in Abrasive jet machining can be reduced by above means and also by Abrasive. 40 µm can be machined using Abrasive jet machining ) Oxygen d ) form of! ) False View answer the types of materials flow d ) All the..., how much times faster, is the full form of USM, over! Has extensive marine applications ) 25 L/min c ) Abrasive grains d ) of. ) decreased c ) medium d ) 0.7 μm, 10, resulted due to lateral is!
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