224 + Interview Questions in Mechanical Processes in Advanced Machining Page 5 InterviewSolution

201.	In the following materials, Water jet machining can be used on which type of material?(a) Metals(b) Plastics(c) Ceramics(d) All of the mentionedThis question was posed to me during an interview for a job.My enquiry is from WJM in chapter Mechanical Processes of Advanced Machining
Answer» Right choice is (d) All of the mentioned Explanation: WJM can be used on metals, cloth, paper, PLASTICS, FOOD, LEATHER, and CERAMICS.

Discussion

202.	What is the accuracy level obtained when PCB’s are cut by WJM?(a) ± 0.05 mm(b) ± 0.13 mm(c) ± 0.26 mm(d) ± 0.33 mmI had been asked this question in exam.Enquiry is from WJM in portion Mechanical Processes of Advanced Machining
Answer» Correct choice is (b) ± 0.13 mm Explanation: In WJM, ACCURACY OBTAINED in cutting of PCB’s is ± 0.13 mm.

Discussion

203.	State whether the following statement is true or false.(a) “As the pump pressure increases, depth of cut decreases in Water jet machining.”(b) True(c) FalseThe question was posed to me by my school principal while I was bunking the class.My question is taken from WJM topic in portion Mechanical Processes of Advanced Machining
Answer» The CORRECT choice is (B) True The EXPLANATION: As the pump pressure is increases, the depth of cut ALSO increases in WJM.

Discussion

204.	What is value of surface finish achieved, when we use the abrasive of grit number 240?(a) 0.01 – 0.08 μm(b) 0.08 – 0.13 μm(c) 0.13 – 0.25 μm(d) 0.25 – 0.38 μmI got this question in an international level competition.I want to ask this question from USM topic in portion Mechanical Processes of Advanced Machining
Answer» RIGHT OPTION is (d) 0.25 – 0.38 μm To explain I would say: The surface roughness obtained, when machined using ABRASIVE of GRIT NUMBER 240, is between 0.25 – 0.38 μm.

Discussion

205.	How much percent of the abrasives are recommended in general for abrasive medium?(a) 10 – 15 %(b) 15 – 20 %(c) 25 – 30 %(d) 30 – 35 %This question was addressed to me during an internship interview.My query is from USM topic in section Mechanical Processes of Advanced Machining
Answer» Correct option is (d) 30 – 35 % To elaborate: In practice, VOLUMETRIC CONCENTRATION of abrasives used RANGE between 30 – 35 %.

Discussion

206.	In the following mechanisms, which one is dominant in material removal?(a) Hammering(b) Cavitation(c) Microchipping(d) None of the mentionedI got this question during an interview.This question is from USM in chapter Mechanical Processes of Advanced Machining
Answer» The CORRECT answer is (a) Hammering Best explanation: Hammering is dominant MECHANISM in material REMOVAL of USM.

Discussion

207.	By which of the following means, material is removed in USM?(a) Mechanical abrasion(b) Microchipping(c) Cavitation(d) All of the mentionedThis question was addressed to me during an online interview.My doubt is from USM in chapter Mechanical Processes of Advanced Machining
Answer» Right option is (d) All of the mentioned For EXPLANATION I would SAY: In Ultrasonic Machining, material is removed by any of the above MEANS.

Discussion

208.	Typical roundness error in graphite, resulted due to lateral vibrations is between?(a) 01 – 20 μm(b) 20 – 60 μm(c) 60 – 100 μm(d) 100 – 150 μmI have been asked this question at a job interview.I need to ask this question from USM in portion Mechanical Processes of Advanced Machining
Answer» RIGHT answer is (B) 20 – 60 μm Best explanation: The roundness is between 20 – 60 μm while MACHINING GRAPHITE by Ultrasonic Machining.

Discussion

209.	Who discovered USM?(a) Balamuth(b) Paul O Flawer(c) Turing(d) Steve JohnThis question was addressed to me during an interview.My question comes from Ultrasonic Machining topic in portion Mechanical Processes of Advanced Machining
Answer» RIGHT answer is (a) BALAMUTH Explanation: Balamuth was the scientist, who discovered ULTRASONIC MACHINING.

Discussion

210.	In Ultrasonic Machining, Magnetostrictor is energized at ultrasonic frequency.(a) True(b) FalseI had been asked this question in an interview for internship.The origin of the question is USM topic in portion Mechanical Processes of Advanced Machining
Answer» The correct choice is (a) True Best EXPLANATION: To oscillate, magnetostrictor must be ENERGIZED to ULTRASONIC frequency in USM.

Discussion

211.	At what rate slurry is pumped through nozzle in USM?(a) 10 L/min(b) 25 L/min(c) 50 L/min(d) 75 L/minI got this question during an interview for a job.Enquiry is from USM topic in chapter Mechanical Processes of Advanced Machining
Answer» CORRECT CHOICE is (b) 25 L/min Easy explanation: SLURRY is PUMPED through nozzle at the rate of 25 L/min, L- litres.

Discussion

212.	What is the full form of USM in advanced machining process?(a) Ultrasound manufacturing(b) Ultrasonic machining(c) UV spectrum manufacturing(d) Ultra sonar machiningI have been asked this question in examination.My question is from Ultrasonic Machining topic in portion Mechanical Processes of Advanced Machining
Answer» Right answer is (b) Ultrasonic MACHINING The best I can explain: FULL FORM of USM in advanced machining PROCESSES, is Ultrasonic machining.

Discussion

213.	What is the percentage of contribution of cavitation to the total material removed?(a)
Answer» The CORRECT ANSWER is (a) <5% To explain: Cavitation CONTRIBUTES to only less than 5 % of TOTAL material removed.

Discussion

214.	What is the value of the amplitude obtained without mechanical amplifier?(a) 0.0001 – 0.001 µm(b) 0.001 – 0.1 µm(c) 1 – 10 µm(d) 10 – 100 µmThe question was posed to me in quiz.Asked question is from USM in division Mechanical Processes of Advanced Machining
Answer» Right CHOICE is (b) 0.001 – 0.1 µm The EXPLANATION: Relatively very SMALL amplitudes are OBTAINED without AMPLIFIER.

Discussion

215.	Which is softer material in USM?(a) Tool(b) Work piece(c) Tool & Work piece(d) None of the mentionedThe question was posed to me during an interview.This intriguing question comes from Ultrasonic Machining in division Mechanical Processes of Advanced Machining
Answer» Right option is (a) Tool The BEST I can explain: Tool is SOFTER than work PIECE in USM.

Discussion

216.	In USM, tool tips must have low resistance and fatigue strength.(a) True(b) FalseI have been asked this question during an interview for a job.This interesting question is from USM in section Mechanical Processes of Advanced Machining
Answer» RIGHT choice is (b) False The best I can explain: In USM, tool tips should must have high wear resistance and fatigue STRENGTH.

Discussion

217.	In Ultrasonic Machining, magnetostrictor converts magnetic energy into which type of energy?(a) Mechanical energy(b) Electrical energy(c) Thermal energy(d) None of the mentionedThis question was addressed to me in examination.My doubt stems from USM topic in portion Mechanical Processes of Advanced Machining
Answer» The CORRECT OPTION is (a) MECHANICAL energy Explanation: Oscillation of MAGNETOSTRICTOR TAKES place by converting magnetic energy to mechanical energy.

Discussion

218.	The machining system of USM contains which of the following components?(a) Magnetostrictor(b) Concentrator(c) Tools and slurry(d) All of the mentionedThe question was asked in an interview.My question is based upon USM in section Mechanical Processes of Advanced Machining
Answer» Correct CHOICE is (d) All of the MENTIONED Explanation: In machining system of USM, the above mentioned components have to be PRESENT.

Discussion

219.	Amplitude of oscillation of tool in USM ranges between ________(a) 0.1-10 μm(b) 10-40 μm(c) 50-100 μm(d) 100-1000 μmI had been asked this question in an internship interview.I'd like to ask this question from Ultrasonic Machining topic in portion Mechanical Processes of Advanced Machining
Answer» The correct option is (B) 10-40 μm The best EXPLANATION: The optimal RANGE USED is between 10-40 μm.

Discussion

220.	What is the value of the amplitude obtained when we use mechanical amplifier?(a) 1 – 10 µm(b) 10 – 40 µm(c) 40 – 50 µm(d) 50 – 100 µmThe question was posed to me in unit test.The question is from USM topic in division Mechanical Processes of Advanced Machining
Answer» Right choice is (c) 40 – 50 µm Best EXPLANATION: Relatively larger AMPLITUDES are obtained when AMPLIFIER is USED.

Discussion

221.	Frequency of tool’s oscillation in USM ranges between ________(a) 5-10 kHz(b) 10-15 kHz(c) 18-20 kHz(d) 25-50 kHzI have been asked this question in an interview for job.I'm obligated to ask this question of Ultrasonic Machining in section Mechanical Processes of Advanced Machining
Answer» Correct OPTION is (c) 18-20 kHz To explain I would say: FREQUENCY used in USM is between 18 – 20 kHz.

Discussion

222.	Of the following scientists, who discovered magnetostrictor effect?(a) Balamuth(b) Steve O Flawer(c) Joule(d) TuringThe question was asked in an international level competition.This interesting question is from USM topic in section Mechanical Processes of Advanced Machining
Answer» Correct CHOICE is (c) Joule Explanation: This EFFECT was discovered by Joule in 1874 at Manchester.

Discussion

223.	USM removes materials using the ____________ tool.(a) Perpendicularly rotating(b) Perpendicularly oscillating(c) Axially oscillating(d) Inclined oscillatingI had been asked this question in an interview for internship.Query is from Ultrasonic Machining topic in division Mechanical Processes of Advanced Machining
Answer» The correct choice is (c) Axially oscillating Easiest explanation: MATERIAL is REMOVED USING AXIAL oscillating TOOL.

Discussion

224.	In which year, discovery of USM took place?(a) 1910(b) 1925(c) 1943(d) 1945I had been asked this question in quiz.This interesting question is from Ultrasonic Machining topic in chapter Mechanical Processes of Advanced Machining
Answer» The CORRECT choice is (d) 1945 For EXPLANATION: Ultrasonic Machining was discovered in 1945.

Discussion

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In the following materials, Water jet machining can be used on which type of material?(a) Metals(b) Plastics(c) Ceramics(d) All of the mentionedThis question was posed to me during an interview for a job.My enquiry is from WJM in chapter Mechanical Processes of Advanced Machining

What is the accuracy level obtained when PCB’s are cut by WJM?(a) ± 0.05 mm(b) ± 0.13 mm(c) ± 0.26 mm(d) ± 0.33 mmI had been asked this question in exam.Enquiry is from WJM in portion Mechanical Processes of Advanced Machining

How much percent of the abrasives are recommended in general for abrasive medium?(a) 10 – 15 %(b) 15 – 20 %(c) 25 – 30 %(d) 30 – 35 %This question was addressed to me during an internship interview.My query is from USM topic in section Mechanical Processes of Advanced Machining

In the following mechanisms, which one is dominant in material removal?(a) Hammering(b) Cavitation(c) Microchipping(d) None of the mentionedI got this question during an interview.This question is from USM in chapter Mechanical Processes of Advanced Machining

By which of the following means, material is removed in USM?(a) Mechanical abrasion(b) Microchipping(c) Cavitation(d) All of the mentionedThis question was addressed to me during an online interview.My doubt is from USM in chapter Mechanical Processes of Advanced Machining

Typical roundness error in graphite, resulted due to lateral vibrations is between?(a) 01 – 20 μm(b) 20 – 60 μm(c) 60 – 100 μm(d) 100 – 150 μmI have been asked this question at a job interview.I need to ask this question from USM in portion Mechanical Processes of Advanced Machining

Who discovered USM?(a) Balamuth(b) Paul O Flawer(c) Turing(d) Steve JohnThis question was addressed to me during an interview.My question comes from Ultrasonic Machining topic in portion Mechanical Processes of Advanced Machining

In Ultrasonic Machining, Magnetostrictor is energized at ultrasonic frequency.(a) True(b) FalseI had been asked this question in an interview for internship.The origin of the question is USM topic in portion Mechanical Processes of Advanced Machining

At what rate slurry is pumped through nozzle in USM?(a) 10 L/min(b) 25 L/min(c) 50 L/min(d) 75 L/minI got this question during an interview for a job.Enquiry is from USM topic in chapter Mechanical Processes of Advanced Machining

What is the percentage of contribution of cavitation to the total material removed?(a)

What is the value of the amplitude obtained without mechanical amplifier?(a) 0.0001 – 0.001 µm(b) 0.001 – 0.1 µm(c) 1 – 10 µm(d) 10 – 100 µmThe question was posed to me in quiz.Asked question is from USM in division Mechanical Processes of Advanced Machining

Which is softer material in USM?(a) Tool(b) Work piece(c) Tool & Work piece(d) None of the mentionedThe question was posed to me during an interview.This intriguing question comes from Ultrasonic Machining in division Mechanical Processes of Advanced Machining

In USM, tool tips must have low resistance and fatigue strength.(a) True(b) FalseI have been asked this question during an interview for a job.This interesting question is from USM in section Mechanical Processes of Advanced Machining

The machining system of USM contains which of the following components?(a) Magnetostrictor(b) Concentrator(c) Tools and slurry(d) All of the mentionedThe question was asked in an interview.My question is based upon USM in section Mechanical Processes of Advanced Machining

Amplitude of oscillation of tool in USM ranges between ________(a) 0.1-10 μm(b) 10-40 μm(c) 50-100 μm(d) 100-1000 μmI had been asked this question in an internship interview.I'd like to ask this question from Ultrasonic Machining topic in portion Mechanical Processes of Advanced Machining

What is the value of the amplitude obtained when we use mechanical amplifier?(a) 1 – 10 µm(b) 10 – 40 µm(c) 40 – 50 µm(d) 50 – 100 µmThe question was posed to me in unit test.The question is from USM topic in division Mechanical Processes of Advanced Machining

Frequency of tool’s oscillation in USM ranges between ________(a) 5-10 kHz(b) 10-15 kHz(c) 18-20 kHz(d) 25-50 kHzI have been asked this question in an interview for job.I'm obligated to ask this question of Ultrasonic Machining in section Mechanical Processes of Advanced Machining

Of the following scientists, who discovered magnetostrictor effect?(a) Balamuth(b) Steve O Flawer(c) Joule(d) TuringThe question was asked in an international level competition.This interesting question is from USM topic in section Mechanical Processes of Advanced Machining

In which year, discovery of USM took place?(a) 1910(b) 1925(c) 1943(d) 1945I had been asked this question in quiz.This interesting question is from Ultrasonic Machining topic in chapter Mechanical Processes of Advanced Machining