a) Drilling Explanation: An increase in tool area distributes grains over the work piece, which reduces the machining rate. Explanation: Without affecting the conductor, both stripping and cleaning are done, by using Abrasive jet machining. With a new look and improved performance across the board the new 2 nd generation ULTRASONIC 20 linear impresses in demanding ultrasonic machining.. With the ULTRASONIC technology developed in collaboration with SAUER, DMG MORI has for many years now been offering high-performance machine tools for the high-precision 5-axis machining of complex workpieces made of advanced materials. Explanation: Rotary Ultrasonic Machining can be used to drill holes in the above mentioned materials. b) CO2 b) Electrical energy d) Abrasive Jet Manufacturing d) All of the mentioned, 4. c) 25 – 30 % The device for converting any type of energy into ultrasonic waves is the ultrasonic transducer. Answer: d Invention relating to a method for controlling an ultrasonic machining, in which an ultrasonic vibration is transmitted via a sonotrode into the material to be machined. c) Corrosion a) 5-10 kHz d) None of the mentioned What is the full form of USM in advanced machining process? a) Only rotation a) 0.01 – 0.08 μm Explanation: After a depth of 5 to 7 mm, in USM sinking, material removal becomes very difficult. What is the value of carrier gas flow rate in Abrasive jet machining? Explanation: Full form of USM in advanced machining processes, is Ultrasonic machining. c) 1974 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). c) 0.25 – 0.40 cm/min c) Thermal energy View Answer. Answer: c b) Carrier gas d) All of the mentioned When the static pressure of the feed is increases, what happens to MRR? Which of the following distribution factors, does not affect the machining parts? A CONVERTER which contains piezoelectric crystals which change the incoming high frequency electrical signal to mechanical vibration. d) All of the mentioned c) Perpendicular Explanation: Inaccurate feed is the factor that affects the accuracy of machining parts. Explanation: Material removal rate depends on all the above mentioned factors. Answer: d Answer: b View Answer. Answer: d View Answer. c) Machining area Explanation: Soft materials such as candy bars, thin softwood etc.., cannot be machined using AJM. 9. Int J Adv Manuf Technol, 103 (1–4) (2019), pp. View Answer. b) 0.3 μm a) True Ultrasonic Machining can be used for which of the following processes and applications? c) Abrasion Various work samples machined by USM1- The first picture on the left is a plastic sample … 1. Answer: d b) 2 to 5 mm 3. Which type of materials can be machined using Abrasive jet machining? 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. b) 50 – 100 µm b) Concentrator 5. b) 0.15 – 1.5 µm State whether the following statement is true or false. Explanation: ECM is usually characterized as low accuracy machining because of its wider machining gap. c) High static pressure d) 0.10 – 0.20 mm c) 2.0 – 5.0 µm Answer: b b) Static Pressure Explanation: In Abrasive jet machining, any of the particles mentioned above can be used as abrasive grains. Ultrasonic cleaning uses ultrasonic waves, or sound that is far higher than the human ear can detect. In machining system of AJM, which is the medium of carrying the abrasive grains for machining? b) EDM d) All of the mentioned, 12. 8. b) Thermal c) ± 0.05 mm View Answer. a) Increases View Answer. Which type of materials can be machined using Abrasive jet machining? View Answer. View Answer. d) 39 L/min 5. Answer: b Explanation: As viscosity is increased, material removal rate is decreased. Answer: b d) None of the mentioned 1. c) 15 times 8. a) 0.1-10 μm a) True View Answer. In advanced machining processes, what is the full form of AJM? 7. c) Medical Answer: b b) Ultrasonic machining b) 30 Hz d) ± 0.07 mm, 15. 5. b) False c) Trace mechanisms a) Mechanical abrasion Answer: a 8. View Answer. Typical roundness error in glass, resulted due to lateral vibrations is between? d) 0.10 – 0.20 mm, 5. What are all the types of materials, which can be machined using AWJM? Answer: d If there is an increase in viscosity of slurry, what happens to MRR? The concept is shown in Fig. Of the following scientists, who discovered magnetostrictor effect? c) 10 – 15 hrs In the following properties of abrasive grains, which of them changes rate of material removal? 9. In AJM, what is the life of synthetic sapphire material nozzle? d) Abrasive Water Jet Manufacturing, 2. This high frequency vibration transfer to abrasive particle contains in abrasive slurry. 5. What is the value of the amplitude obtained without mechanical amplifier? In AJM, abrasive jet from the nozzle follows, which type of path for a short distance? What is the frequency of mixing chamber, consisting of gas and abrasives? d) All of the mentioned, 5. The faster the vibrations, the higher the pitch of sound we hear. c) Shape Answer: a c) 0.08 – 0.10 mm c) Shape After how much time tool has to be changed in AJM? b) 10-15 kHz 20,000 oscillations per second c. 35,000 oscillations per second d. 45,000 oscillations per second 5. View Answer. b) <500 mm2 Which of the following process comes under mechanical machining? c) High current densities View Answer. c) Electro-plating c) Outside temperature c) 0.5 μm In USM, tool tips must have low resistance and fatigue strength. d) 1.10 – 1.50 mm, 12. Working of ultrasonic machining equipment and working principle An electronic oscillator used to produce an alternating current of high frequency at the ultrasonic range. Of the following scientists, who discovered magnetostrictor effect? In Ultrasonic Machining, Magnetostrictor is energized at ultrasonic frequency. In AJM, which of the following materials are used as abrasive grains? b) Decreases Rotary ultrasonic machining (RUM) is an effective solution to cut, grind, or drill the advanced brittle hard materials. b) False b) Abrasive wear a) 0.0001 – 0.001 µm Explanation: In machining system of USM, the above mentioned components have to be present. Explanation: Penetration rate depends on cavity’s depth and size of the cavity i.e.., area and volume, which can be determined by diameter. When was Abrasive water jet machining developed first? View Answer, 2. d) Decrease and then increase b) 50 – 150 m/sec c) Average hardening View Answer. d) 20 – 50 %, 3. a) True 3. c) Accurate feed What is the frequency of mixing chamber, consisting of gas and abrasives? b) Low b) Inclined Answer: b c) 60 – 100 μm Explanation: Abrasive particles follow a parallel path for short distance and then flare outward. c) 18-20 kHz Answer: b Ultrasonic machining (USM) is a mechanical material removal process used to erode holes and cavities in hard or brittle work pieces by using shaped tools, high-frequency mechanical motion, and an abrasive slurry. a) 10 – 40 µm Which of the following components, influence the material removal rate in Abrasive jet machining? a) True d) 100 – 150 μm View Answer. d) All of the mentioned, 11. If there is an increase in viscosity of slurry, what happens to MRR? b) 10 – 40 µm c) Hard materials Introduction • Ultrasonic machining (USM) is the removal of hard and brittle materials using an axially oscillating tool at ultrasonic frequencies [18–20 kHz] • During that oscillation, the abrasive slurry of B4C or SiC is continuously fed into the machining zone between a soft tool (brass or steel) and the workpiece. d) 70 Hz Sources used in thermal machining are ________ c) Joule Which of the following are the features of tool affecting MRR in USM? c) <1000 mm2 Which is softer material in USM? d) 150 – 250 μm b) Decreased Explanation: Unsteady and uneven abrasive flow affects the dimensional accuracy. Explanation: Abrasive water jet machining is 10 times faster than the conventional machining. b) Air carrier The machining system of USM contains which of the following components? Explanation: USM removes material by mechanical erosion. The machinability of USM depends on brittleness criterion. b) Perpendicularly oscillating In AJM, abrasive jet from the nozzle follows, which type of path for a short distance? d) None of the mentioned, 2. 1. c) 30% water and 70% abrasives d) All of the mentioned c) Striations c) Low-rigidity structures The result of past work in the field of ultrasonic machining is reviewed and the effects of process parameters isolated. d) High a) Size c) 1943 d) Decrease up to a limiting condition By using Abrasive jet machining, how much amount of hardening does the materials experience? Ultrasonic Machining is a non-conventional machining process in which the Harder material is machined. Explanation: Full form of AWJM is Abrasive Water Jet Machining. View Answer. d) Inclined oscillating, 4. d) All of the mentioned 8. The power rating of machine is about 0.2 to 2.5 kW. State whether the following statement is true or false. b) 25 L/min b) Paul O Flawer a) 10 – 15 % b) Material generally above 16 kHz. a) Abrasive grains View Answer. View Answer. Amplitude of the oscillation ranges between which of the following values? Explanation: Abrasive jet machining can be used for micro deburring of hypodermic needles. Ultrasonic machining is a nontraditional process. d) All of the mentioned 4. 2. Typical roundness error in glass, resulted due to lateral vibrations is between? In micro ECM, which of the following is used as micro tool? d) 50 – 100 µm What is the grain size of abrasive particles, which are often used for Abrasive water jet machining? c) Size b) False d) Three times smaller, 6. a) Decreases a) Cleaning c) Moving the work piece & Switching the pulse current c) Tool & Work piece 5. Which of the following distribution factors, does not affect the machining parts? Which one of the following factors affects the accuracy of parts? d) All of the mentioned, 10. • Such a small vibration is amplified using the constrictor (mechanical amplifier) that holds the tool. d) Inclined oscillating d) None of the mentioned, 4. Answer: a d) Decrease and then increase, 7. 3. c) Remained same d) None of the mentioned, 4. a) True a) 0.01 – 0.04 mm c) 50-100 μm b) Abrasive Jet Machining b) False c) Turing Sound of less than 20 kHz is perceptible by humans and is therefore described as audible sound. Ultrasonic refers to waves of high frequency above the audible range of 20 kHz. Explanation: Tool over cut is 3 times greater than mean grain size while machining B4C. 3. b) ± 0.05 mm Ultrasonic tests often are performed to assess corrosion on pipes, valves and steel or aluminum constructions. d) Vaporization, 5. c) Quartz Explanation: Chemical machining removes material by chemical reactions. d) Steve John, 2. What is the value of the amplitude obtained when we use mechanical amplifier? d) 39 L/min, 10. a) Tool As the abrasive flow rate increases, what happens to the volumetric removal rate? Answer: a c) Remains same b) 2.0 to 8.0 kg /cm2 View Answer. c) 0.13 – 0.25 μm a) Brittle c) Mechanical abrasion In the following USM accuracy levels are limited to which value? d) All of the mentioned, 8. a) 100 hrs Which of the following material/s cannot be used for making of nozzle in Abrasive jet machining? Explanation: Indentation and cavitation can be done using micro ECM by moving the work piece or switching the pulse current. c) 1943 b) Gases d) All of the mentioned, 7. How much percent of the abrasives are recommended in general for abrasive medium? 20Khz Ultrasonic Food Cutting Equipment 800W , Professional Meat Slicer Machine. a) Depth 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. d) Mounting, 8. d) None of the mentioned, 3. In Ultrasonic Machining, magnetostrictor converts magnetic energy into which type of energy? c) Microchipping b) Strength a) Direct injection of slurry View Answer. b) Oil a) Glass An ultrasonic tester also is used to detect flaws such as cracks and leaks. Sandwiched piezoelectric ultrasonic transducers of longitudinal-torsional compound modes were designed and fabricated according to the frequency equations. Explanation: Diameter value up to 5 μm can be achieved, using Micro-ultrasonic machining on glass, silicon and quartz materials, 1. a) No hardening b) 0.001 – 0.1 µm View Answer. Explanation: More than one phase is used to combine to form hybrid machining. a) 100 hrs a) Automatic Jet Manufacturing b) Jet engines With the help of 4BEngineers, students can avail online coaching through video lecture at an unimaginably affordable cost, access the coaching content from renowned teaching experts, and be one on one with their personal favorite coach. 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, ***************************************************************. 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