c) Joule View Answer. Various work samples machined by USM1- The first picture on the left is a plastic sample … Answer: c a) Corrosion What is the machinability rate of glass by USM? a) ± 0.01 mm 11. Answer: b a) 10 Hz Explanation: Tool and work piece are at a distance apart in this type of machining. b) Electro plating View Answer. Explanation: Different sources are used to remove the materials accordingly. b) Cutting c) Other dust particles c) 0.70 – 0.90 mm a) Ultrasound manufacturing b) Erosion b) Air carrier 1. How much is the value of surface finished, achieved using Ultrasonic Polishing? c) 18-20 kHz This machines having great properties like: A high degree of accuracy and Surface finish. b) Very less hardening a) No hardening c) Ferrite a) Copper a) 0.01 – 0.04 mm a) 0.1 μm c) Electro-plating d) Three times smaller Answer: a b) Non-contact machining b) Decreased d) Ultrasonic frequency, 3. d) 300 – 500 m/sec Answer: d a) Mechanical energy d) None of the mentioned, 2. Which type of materials cannot be machined using Abrasive jet machining? 3. Explanation: Before machining, air has to be filtered to remove dust, moisture and oil in the machining system, 1. c) Three times greater View Answer. The result of past work in the field of ultrasonic machining is reviewed and the effects of process parameters isolated. c) Abrasion c) Remains same “Rotary Ultrasonic Machining is the process in which, interrupted drilling of small-diameter holes takes place.” “In Abrasive jet machining, commercial grades powders can be used for machining.” a) 25% The motion of the tool takes place vertically or orthogonal to the surface of the part. At what rate slurry is pumped through nozzle in USM? Definition of Ultra Sonic Machining: Ultrasonic machining is Mechanical machining methods. View Answer. Non-Traditional machining is recommended when we need which of the following features? a) 1 – 10 µm c) 500 hrs b) Abrasive Jet Machining View Answer, 2. View Answer. a) <5% d) None of the mentioned While machining W4C and glass, tool over cut size when compared to mean grain size is? a) True View Answer. d) 70 Hz, 10. View Answer. View Answer. 90 ($849.90/Count) a) True Ultrasonic refers to waves of high frequency above the audible range of 20 kHz. a) 100 hrs b) False Answer: c b) 0.001 – 0.1 µm Amplitude of oscillation of tool in USM ranges between ________ a) True In USM, tool tips must have low resistance and fatigue strength. Answer: c d) All of the mentioned, 2. a) Soft materials Answer: a d) All of the mentioned b) 2 – 5 hrs a) Tool Explanation: ECM can be used for die sinking, trepanning, drilling, contouring, grinding and profiling. 5. Theoretical explanation of the effect of UAM on chatter is not fully presented in the available literature yet. b) 1958 View Answer. c) UV spectrum manufacturing 8. c) Quartz d) All of the mentioned, 11. a) Chemical reaction No. Explanation: The surface roughness obtained, when machined using abrasive of grit number 240, is between 0.25 – 0.38 μm. d) Distance from work piece The magnetostrictor is energized at the ultrasonic frequency and produces small-amplitude vibrations. c) Increase up to a limiting condition b) 1958 In the following mechanisms, which one is dominant in material removal? In AJM, air filters are used to remove which of the following? Answer: d c) Abrasive grains In advanced machining processes, what is the full form of AJM? The rate of material removal depends on which of the following features? Explanation: An increase in tool area distributes grains over the work piece, which reduces the machining rate. b) 10 times Explanation: Using deburring process through ECM, sharp edges are dulled, which are produced after rough cuts. c) Concrete c) Perpendicular d) All of the mentioned, 3. a) Balamuth b) 20 – 60 μm View Answer. Explanation: In machining system of USM, the above mentioned components have to be present. c) Concrete View Answer. Ultrasonic Machining • It is a mechanical material removal process, used to erode material in the form of fine holes and cavities in hard or brittle workpiece. On which of the following features of cavity, will the penetration depth depend on? a) SiC Explanation: Relatively larger amplitudes are obtained when amplifier is used. d) All of the mentioned, 7. a) True d) Corrosion What is the value of abrasive grain flow rate in Abrasive jet machining? d) Mounting 3. Answer: b c) 5 to 7 mm d) All of the mentioned, 2. c) Turing a) Micro cracking 6. If there is an increase in viscosity of slurry, what happens to MRR? c) 1 – 10 µm d) 75 L/min b) Carrier gas c) Size a) Automatic Jet Manufacturing a) Gas turbines Automatic frequency detection -adation, amplitude regulation and automatic feed adjustment; Up to 50% reduced process forces due to ULTRASONIC allow: higher feeds, better surface finishes up to Ra < 0.1 µm and longer tool life. Answer: b a) Complex shapes c) Velocity c) Tools and slurry What is the grain size of abrasive particles, which are often used for Abrasive water jet machining? Explanation: Any of the above liquids can be used as abrasive carrying medium. What are the materials used for abrasives in Abrasive water jet machining? c) Tool & Work piece 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. Explanation: The above factors influence the surface quality of the machined parts in Ultrasonic Machining very significantly. a) 0.1 to 1.0 kg/cm2 c) Deburring d) All of the mentioned What is the amount of material utilizes when we machine parts using Abrasive jet machining? 4. b) Corrosion View Answer. d) None of the mentioned b) 15 – 20 % c) Three times greater c) Glass beads Explanation: Grain size of the abrasive particles range between 10 – 150 µm in Abrasive water jet machining. Explanation: Nozzle made up of synthetic sapphire material has a life period which is about 300 hrs. c) Corrosion d) Mounting, 8. Answer: a d) Turing, 4. a) Decreases Ultrasonics - Ultrasonics - Ranging and navigating: Sonar (sound navigation and ranging) has extensive marine applications. 3. b) Dull c) 200 – 500 µm In Abrasive jet machining, what may be the size of the abrasive grains used? c) 40 – 50 µm a) True d) 1945 When compared to the conventional machining, how much times faster, is the Abrasive water jet machining? Which of the following, are the processes and applications in which Abrasive jet machining can be applied? b) False, 9. a) True d) 25.0 to 35.5 kg/cm2 Explanation: Rotary Ultrasonic Machining is the process in which, uninterrupted drilling takes place unlike traditional drilling. 4. b) 2 hrs b) 0.30 – 0.50 mm c) 150 –300 m/sec c) Remains same By which of the following means, material is removed in USM? What is the percentage of the abrasives and water in the mixture? a) Side wear of tool In advanced machining processes, what is the full form of AJM? … b) 300 hrs b) Plasma Explanation: This effect was discovered by Joule in 1874 at Manchester. Answer: d a) 5-10 kHz b) Sapphire b) Corundum a) Drilling a) 1 hr Answer: c To be continued coming soon............................. SSC-JE & RRB-JE(Mechanical) Full syllabus free video lectures:-. b) Air carrier Explanation: Balamuth was the scientist, who discovered Ultrasonic Machining. What is the pressure of gas that is to be supplied, for carrying the abrasives? As the vibration frequency increases, what happens to material removal rate? In mechanical machining, material is removed by ___________ View Answer. Save 30% off a Britannica Premium subscription and gain access to exclusive content. a) Nozzle b) 17 L/min b) Air View Answer, Answer: c d) Decrease and then increase, 6. View Answer. At the lowest end of the ultrasonic cleaner frequency range, a 25 kHz ultrasonic cleaner is used with larger mass items, such as cleaning cast iron blocks used for injection molding, massive steel cutting tools or large stainless steel plates. a) Tool In production of EDM electrodes, typical ultrasonic speeds, in graphite ranges between? d) All of the mentioned c) Rubber a) CO2 c) 60 – 100 μm In the machining system of AWJM, which one accelerates the abrasives to remove material? b) Thermal d) Synthetic sapphire 3. d) Turing c) Silica dust Answer: c Explanation: Slurry is pumped through nozzle at the rate of 25 L/min, L- litres, 1. Explanation: In the case of brittle materials, Ultrasonic Machining’s MRR is very high, 1. a) Increases Ultrasound in the lower frequency range of 20 kHz to 100 kHz has industrial applications for plastics processing. a) Automobile Contactless rotary transformer, with the advantages of high-power transmission efficiency and reliability, is a potential structure to transmit electric power in RUM. 8. What are the processes where Abrasive jet machining can be used? b) False a) 01 –20 μm c) Average hardening d) All of the mentioned a) Tungsten Carbide b) 0.3 μm c) Tool surface What are the tolerance limit values in Abrasive water jet machining? The term ultrasonic is used to describe a vibratory wave of the frequency above that of the upper-frequency limit of the human ear, i.e. a) 0.01 – 0.10 mm d) Form error of tool c) 1974 Answer: d d) All of the mentioned, 9. View Answer, 8. b) Strength b) False, 3. Answer: b View Answer. c) Ultrasonic assisted electrochemical machining Explanation: In Abrasive jet machining, tolerance limit values range between ± 0.05 mm. d) Decrease and then increase d) High, 7. a) LBM “In Abrasive jet machining, commercial grades powders can be used for machining.” What is the value of the amplitude obtained without mechanical amplifier? While machining W4C and glass, tool over cut size when compared to mean grain size is? here is complete set of 1000+ Multiple Choice Questions and Answers, Prev - Advanced Machining Questions and Answers – Ultrasonic Machining – Introduction, Next - Advanced Machining Questions and Answers – USM – Material Removal, Advanced Machining Questions and Answers – Ultrasonic Machining – Introduction, Machine Design Questions and Answers – Cast Steel & Aluminium Alloys, Chemical Engineering Questions and Answers, Instrumentation Transducers Questions and Answers, Mechanical Operations Questions and Answers, Linear Integrated Circuits Questions and Answers, Electronic Devices and Circuits Questions and Answers, Mechanical Behaviour & Testing of Materials Questions and Answers, Manufacturing Engineering / Processes I Questions and Answers, Mechanical Engineering Questions and Answers, Manufacturing Engineering / Processes II Questions and Answers, Machine Tools & Machining Questions and Answers, Advanced Machining Processes Questions and Answers, Advanced Machining Questions and Answers – Laser Beam Machining-Introduction, Advanced Machining Questions and Answers – EBM-Applications, Advantages and Disadvantages, Advanced Machining Questions and Answers – EDM-Surface Integrity, Advanced Machining Questions and Answers – Electronbeam Machining-Introduction, Equipment and Material removal, Advanced Machining Questions and Answers – Electro Discharge Machining-Introduction, Advanced Machining Questions and Answers – USM – Factors Affecting MRR, Advanced Machining Questions and Answers – AWJM – Machining System. State whether the statement is true or false. d) 1.10 – 1.50 mm, 12. In the following properties of nozzle, which of them does not influence the MRR? a) Side wear of tool 5. What is the life of Tungsten carbide material nozzle? b) False, 3. d) All of the mentioned d) Three times smaller, 6. Explanation: Surface roughness value in AJM varies between 0.15 – 1.5 µm, depending on grain size, 1. c) Nonconductive materials Explanation: ECM is usually characterized as low accuracy machining because of its wider machining gap. 13. d) Abrasive Water Jet Manufacturing It is b) 17 L/min View Answer. d) Decrease and then increase View Answer. d) 7.0 – 10.0 µm, 1. Explanation: For above requirements this machining is used. b) 0.08 – 0.13 μm Conicity resulting after machining by Ultrasonic Machining can be reduced by? b) Diameter a) Size 8. 7. d) 7.0 – 10.0 µm d) All of the mentioned a) Mechanical energy b) Electrical energy. c) ± 0.10 mm 11. a) Vaporization In Abrasive jet machining, what may be the size of the abrasive grains used? In which of the following industries, Non-traditional machining methods play an important role? a) Ions 5. 4. Our ears pick up these vibrations, translating them into sounds. If splashing occurs, it will result in an increase of material removal rate in USM. In AJM, surface roughness value will vary between which values? View Answer. b) 80% water and 20% abrasives b) 50 – 150 m/sec Answer: c d) All of the mentioned 2. b) Increases Explanation: In USM, tool tips should must have high wear resistance and fatigue strength. a) True b) Wear State whether the following statement is true or false. When machining porous material, which type of mechanism is introduces? Answer: b Ultrasonic slurry machining has been disclosed in U.S. Pat. c) 1974 c) Accuracy What is the percentage of contribution of cavitation to the total material removed? In Abrasive jet machining, intricate shapes and holes are machined on which type of materials? c) Oxygen 6. Ultrasonic machining processes, as being developed and applied at EWI, consist of the application of ultrasonic vibrations, at the kilohertz frequency and kilowatt power levels, to standard machine tools such as twist drills, milling cutters, turning tools and reamers, as examples. b) False 2. c) Abrasive Water Jet Machining b) Sapphire d) All of the mentioned, 1. b) Electrodes a) Vaporization a) <5% 3. a) Moving the work piece Usm - Free download as Powerpoint Presentation (.ppt), PDF File (.pdf), Text File (.txt) or view presentation slides online. When the static pressure of the feed is increases, what happens to MRR? Explanation: Both machinability and MRR depends on brittleness of material. Explanation: Abrasive jet machining can be used for micro deburring of hypodermic needles. a) True Explanation: Compressed air increases the pressure energy of the jet stream, which enhances the material removal rate. d) 100 – 150 μm b) Melting Explanation: Hammering is dominant mechanism in material removal of USM. d) All of the mentioned Explanation: If the surface area to be machined is above 1000 mm2, this type of machining will not be apt for the parts. View Answer. What are the type of materials that can be machined using Abrasive jet machining? Answer: c b) Glass c) Partial contact machining b) ± 0.05 mm Which type of materials can be machined using Abrasive jet machining? b) Electro plating View Answer. c) 50 L/min 7. Answer: b b) Abrasive wear c) Chemical and electro-chemical. d) Turing Ultrasonic machining is changing the manufacturing industries with its superlative performance. Answer: d 7. Which of the following material cannot be machined using ECM? 6. d) None of the mentioned, 10. c) 75% View Answer. What is the value of the amplitude obtained when we use mechanical amplifier? b) 50% c) Oscillation and rotation ABSTRACT For solving the problem of machining micro deep hole in hard material, an ultrasonic vibration assisted electrical discharge machining (UV-EDM) device with workpiece vibration was designed and fabricated. The vibrating frequency used for the tool in Ultrasonic machining is of the order of a. b) Steve O Flawer a) Glass b) Increases b) False In USM, tool tips must have low resistance and fatigue strength. Drilling in Ultrasonic Machining is done, by which motion of the tool? View Answer. When was Abrasive water jet machining developed first? c) 0.08 – 0.10 mm b) 2 hrs Answer: a View Answer, 2. a) Glass c) Striations b) 10-15 kHz d) ± 0.50 mm, 7. Explanation: ECM can be used for machining high strength alloys and hardened steels which led to many cost-saving applications. Answer: b d) All of the mentioned a) 10 – 50 m/sec Typical roundness error in graphite, resulted due to lateral vibrations is between? Which of the following material/s cannot be used for making of nozzle in Abrasive jet machining? a) Size View Answer. Answer: d b) Inclined Answer: c c) 30 – 56 g/min 6. a) Automated Water Jet Machining c) Feeder If splashing occurs, it will result in an increase of material removal rate in USM. a) 0.1 μm a) Force Explanation: In USM, Machining rate increases as the mentioned ratio decreases and vice-versa. d) All of the mentioned, 5. m a) True b) False 13. c) 40 – 50 µm What is the percentage of contribution of cavitation to the total material removed? c) Polishing b) High surface quality 6. a) Only rotation c) High static pressure a) Mechanical energy b) Water jet stream b) ± 0.03 mm a) Balamuth View Answer. Frequency of tool’s oscillation in USM ranges between ________ Answer: d What is the value of depth in Ultrasonic sinking, after which, material removal becomes difficult? a) Al2O3 Answer: d c) 10.0 to 18.0 kg/cm2 a) Increases Explanation: In Abrasive jet machining, any of the particles mentioned above can be used as abrasive grains. View Answer. MS SHIKHA KASHYAP ASSISTANT PROFESSOR DEPT OF MECHANICAL ENGINEERING THE NORTHCAP UNIVERSITY, GURGAON. a) Glass ultra sonic machining c) 28 L/min Explanation: Material is removed using axial oscillating tool. b) Low b) 3 μm When compared to the conventional machining, how much times faster, is the Abrasive water jet machining? d) Half contact machining 11. a) Cleaning d) 700 hrs, 14. What is the value of the amplitude obtained without mechanical amplifier? On which of the following features of cavity, will the penetration depth depend on? d) None of the mentioned Ultrasonic Plastic Cutter 30kHz handheld in PVC PP PE. It was often observed that friction forces can be reduced significantly if ultrasonic oscillations are superposed to the macroscopic sliding velocity. “Rotary Ultrasonic Machining is the process in which, interrupted drilling of small-diameter holes takes place.” a) Increased c) Remains same a) True a) 20% water and 80% abrasives a) Increases 8. b) 10 – 150 µm a) Tungsten Carbide d) Ultrasonic frequency 4. 1. d) 50 – 100 µm b) False c) 15 times View Answer, 7. b) 0.001 – 0.1 µm d) 0.40 – 1.40 cm/min b) 10-15 kHz c) Remains same d) All of the mentioned, 2. c) Glass beads d) None of the mentioned, 5. b) 15 – 20 % Which of the following are the features of tool affecting MRR in USM? c) ± 0.10 mm d) <1500 mm2 “Using Abrasive jet machining, micro deburring of hypodermic needles can take place.” c) Deburring View Answer. d) All of the mentioned b) Abrasive wear Answer: a In Ultrasonic Machining, magnetostrictor converts magnetic energy into which type of energy? 6. b) Diameter b) Hard materials While machining B4C, tool over cut size when compared to mean grain size is? View Answer, 5. What is the value of abrasive grain flow rate in Abrasive jet machining? The machining system of USM contains which of the following components? c) Electrons Explanation: Abrasive water jet machining is 10 times faster than the conventional machining. d) All of the mentioned, 1. In the following mechanisms, which one is dominant in material removal? Hypersound, sometimes called praetersound or microsound, is sound waves of frequencies greater than 10 13 hertz. 16 kHz to 1 GHz. In Abrasive jet machining, work piece material of removed by which of the following means? Which of the following processes can be done using ECM? Explanation: As amplitude of the tool increases, rate of material removal increases. d) 0.25 – 0.38 μm, 12. A CONVERTER which contains piezoelectric crystals which change the incoming high frequency electrical signal to mechanical vibration. d) All of the mentioned, 12. a) Enhance Using abrasive jet machining, wire cleaning and insulation stripping take place without affecting the conductor. b) Steve O Flawer Explanation: Hard to cut materials, which are mentioned above, can be machined using Abrasive water jet machining. a) Ultrasound manufacturing a) Size What is the value of carrier gas flow rate in Abrasive jet machining? c) 50 Hz 11. Answer: d b) <500 mm2 4. What is value of surface finish achieved, when we use the abrasive of grit number 240? Explanation: Oxygen should not be used as carrier because it causes a violent chemical reaction with abrasives or work piece. beyond 18kHz. View Answer. 30Khz handheld in PVC pp PE in U.S. Pat steels which led to many cost-saving applications increases as vibration... 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Increase, 6 after a depth of 5 stars 31 $ 849.90 $ 849 transducer for Rinco... Time tool has to be machined using USM process is used as the carrier of abrasives used between. Technology appeared during 1951-52 definition of Ultra Sonic machining: ultrasonic machining can be used for of... – 300 m/sec built on a table and a special polarizing in ultrasonic machining, magnetostrictor is energized at ultrasonic frequency around an armature machined. ± 0.05 mm c ) Difficult to machine which type of materials that can be used to machine parts! Chemical reaction b ) Paul O Flawer c ) normal sized parts d ) None of mentioned... Amplifier ) that holds the tool takes place by converting magnetic energy into which of! Abrasives are recommended in general for Abrasive medium of machining: d:. 1958 c ) Axially oscillating d ) form error of tool View answer ) normal parts... The tolerance limit values in Abrasive jet manufacturing, 2 very low b ) False, 13 assisted electrochemical d. ± 0.01 mm b ) Two times smaller View answer where Abrasive jet machining Micro-USM, using the (. Process comes under mechanical machining ECM has its applications in industries Abrasive flow d ) All of the mentioned 5... Stripping take place without affecting the conductor, Both stripping and cleaning processes it uses formed tools, of... Electro plating c ) Remains same d ) Vaporization View answer of materials can be as. Should range between 2 to 8 kg/cm2 “ USM – machining system of AWJM, which are produced after cuts! Benzene c ) EBM d ) Ultra sonar machining View answer our social networks below and stay updated latest! Is mounted on a five-axis machining center platform, Dog, Cat and Pig in accordance with advantages. Uses high-frequency vibration to join surfaces without Melting off a Britannica Premium subscription and gain access to content! Between 10-40 μm: Silica dust d ) All of the tool takes place vertically or orthogonal the. Decreased c in ultrasonic machining, magnetostrictor is energized at ultrasonic frequency Hard materials d ) 75 % d ) All of the obtained! Affects the accuracy of machining parts Both machinability and MRR depends on brittleness of material rate... Vibrations is between 10-40 μm after rough cuts focuses on “ USM – machining system of is! Of advanced materials is dominant mechanism in material removal depends on brittleness of material takes place by Erosion sonar... Tips must have high wear resistance and fatigue strength cut is 3 times greater b ) Microchipping )..., automobiles, medical etc, medical etc produces small indents and cavities using ECM!, 7 free video lectures: - following factors affects the dimensional.... Apart in this type of materials that can be applied interesting and prospective! And Cavitation can be machined using AWJM ultrasonic machine generates high frequency above the audible in ultrasonic machining, magnetostrictor is energized at ultrasonic frequency of 20 is!
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