3/22/25, 5:53 PM Introduction to Abrasive Machining and Finishing Processes - - Unit 11 - Week 8 : Advanced Abrasive Finishing Processes-2

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Week 8: Assignment 8
(https://examform.nptel.ac.in/2025_01/exam_form/dashboard)
The due date for submitting this assignment has passed.

If already Due on 2025-03-19, 23:59 IST.

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registered, click
to check your 1) Magnetorheological finishing medium is composed of 1 point
payment status
Micron sized magnetizable particles in non-magnetizable medium
Micron sized non-magnetizable particles in magnetizable medium
Micron sized non-magnetizable particles in non-magnetizable medium
Course
Micron sized magnetizable particles in magnetizable medium
outline
No, the answer is incorrect.
Score: 0
About
Accepted Answers:
NPTEL ()
Micron sized magnetizable particles in non-magnetizable medium

How does an
2) Magnetorheological finishing is used for finishing knee joint implants because: 1 point
NPTEL
online
Better surface finish leads to lower wear of the implants
course
work? () Better surface finish reduces the cost of the implants
Better surface finish reduces the cost of production
Week 1: None of the above
Introduction
No, the answer is incorrect.
to Score: 0
Conventiona
Accepted Answers:
l Abrasive Better surface finish leads to lower wear of the implants
Processes ()

3) In magnetic rheological finishing, why is magnetic field applied 1 point

Week 2:
Sustainable To stiffen the abrasive particles

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3/22/25, 5:53 PM Introduction to Abrasive Machining and Finishing Processes - - Unit 11 - Week 8 : Advanced Abrasive Finishing Processes-2

Grinding To soften the abrasive particles

Process ()
To hold the workpiece in position

Week 3: For no particular reason

Honing, No, the answer is incorrect.
Lapping and Score: 0
Super Accepted Answers:
Finishing. () To stiffen the abrasive particles

4) In magnetorheological finishing, magnetic particles are used in the finishing medium 1 point
Week 4 :
ar typically sized from
Conventiona
l Abrasive 20 nm
Process and
20 µm
Surface
Integrity in 20 cm
Abrasive 0.02 nm
Process ()
No, the answer is incorrect.
Score: 0
Week 5 : Accepted Answers:
Advanced 20 µm
Abrasive
Machining 5) In magneto rheological finishing, magnetic field is applied using which of the 1 point
Processes ()
following magnet types :

Week 6 : Electromagnet
Hybrid
Permanent magnet
Abrasive
Machining Horseshoe magnet
Processes () None of these
No, the answer is incorrect.
Week 7 : Score: 0
Advanced Accepted Answers:
Abrasive Electromagnet
Finishing
Processes-1 6) You have finished a component using rotational magnetorheological abrasive flow 1 point
() finishing processe. What is the lay direction expected from the component.

Week 8 : Semi circular

Advanced Circular
Abrasive
Helical
Finishing
Processes-2 Cross hatch pattern
() No, the answer is incorrect.
Score: 0
Lec. 1: Accepted Answers:
Magneto Helical
Rheological
Finishing and
7) Compared to traditional abrasive flow finishing medium, medium used for 1 point
BE-MRF (unit?
unit=54&lesso
magnetorheological finishing has _______ viscosity
n=55)
lower
Lec. 2: higher
Magnetic Field

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3/22/25, 5:53 PM Introduction to Abrasive Machining and Finishing Processes - - Unit 11 - Week 8 : Advanced Abrasive Finishing Processes-2

Assisted double
Abrasive
Finishing:
equal
CNP, CMMRF, No, the answer is incorrect.
MRAFF, R- Score: 0
MRAFF (unit? Accepted Answers:
unit=54&lesso lower
n=56)
8) The hardness of the passivation layer in chemomechanical polishing is ______ 1 point
Lec. 3:
Summary of Higher than parent material
the Course
Lower than abrasive particle
(unit?
unit=54&lesso Lower than parent material
n=57) Lower than both abrasive particle and parent material

Quiz: Week 8: No, the answer is incorrect.

Assignment 8 Score: 0
(assessment? Accepted Answers:
name=124) Lower than both abrasive particle and parent material

Week 8
9) With respect to magnetorheological Abrasive flow finishing setup, which of the 1 point
Feedback form
: Introduction
statements is TRUE
to Abrasive
The electromagnet coils are connected to AC power source
Machining and
Finishing The electromagnet coils are connected to DC power source
Processes No workpiece fixture is necessary
(unit?
unit=54&lesso
The hydraulic setup is not necessary
n=58) No, the answer is incorrect.
Score: 0
Download Accepted Answers:
Videos () The electromagnet coils are connected to DC power source

Text 10) Let hardness of the abrasive, parent material and passivation layer are h1 , h2 , and 1 point
Transcripts h3 respectively. Then, the necessary condition to get a scratch free surface from
() chemomechanical polishing process is _________

Lecture
h1 > h2 > h3
Notes ()
h3 > h2 > h1
Books ()
h2 > h1 > h3

h1 < h2 < h3

No, the answer is incorrect.

Score: 0
Accepted Answers:
h2 > h1 > h3

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