MECH502 Mechanical Engineering Exam || All Accurate Questions & Answers (Graded A+)
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MECH502 Mechanical Engineering Exam || All Accurate Questions & Answers (Graded A+)
MECH502 Mechanical Engineering Exam || All Accurate Questions & Answers (Graded A+)
The slope of a photopolymer's working curve represents... - ANSWER - The distance a given irradiance will decrease by an amount...
, MECH502 Mechanical Engineering
Exam || All Accurate Questions &
Answers (Graded A+)
The slope of a photopolymer's working curve represents... - ANSWER - The distance
a given irradiance will decrease by an amount equal to the half-width of the
gaussian, as it penetrates a given photopolymer
Your boss emails you the following picture and asks you how it was made using
additive manufacturing. He is amazed that the object is 10 µm long and 7 µm high,
made of urethane acrylate. What is most likely the AM process used to make this
part? (see 2 photon bull image on desktop) - ANSWER - Two-photon
photopolymerization
Your colleague asks you which AM process was most likely used to make this
object. It has a rough, grainy surface that appears to have been post-processed with
a coating that gives it the shine you see. What do you tell her? (see heart model
image on desktop) - ANSWER - Binder jetting
Your colleague asks you which AM process was most likely used to make this
object. He tells you it's made of fully dense titanium and has a rough, grainy surface.
What do you tell him? - ANSWER - Powder bed fusion
Your colleague asks you which AM process was likely used to make this object. You
can easily see its corrugated, shiny surface that the technician says is direct from the
printer (i.e. there was no post-processing on these parts), and your analysis lab says
the parts are fully-dense. What do you tell her? (see boeing image on desktop) -
ANSWER - Directed energy deposition
Which type of sintering is characterized by the coalescence of powder particles of
more than one material without full melting? - ANSWER - All of the above: Indirect
sintering, liquid phase sintering, chemically-induced sintering
The terms "precision" and "resolution" are used interchangeably to refer to: -
ANSWER - The smallest feature that a particular 3D printer can print, independent of
any particular material.
Which set of characteristics provides the best list of the things to consider when
deciding which additive process to use to make a particular part? - ANSWER -
Purpose of part (e.g. functional requirements), material requirements, size of part
Which set of metrics lists two of the most important considerations when deciding to
make a product using additive manufacturing, or if subtractive or formative
manufacturing may be a better choice? - ANSWER - Cost per complexity, Cost per
quantity
, True or False: Bioprinting usually uses a jetting process with a very fine spray of
material. - ANSWER - False
In the context of 3D digital modeling, what is a "manifold" model? - ANSWER - A
model that is completely closed between the inside of the model and the outside. If it
were a physical object, it could hold water.
The term "Dynamic precision" refers to... - ANSWER - A measure of the smallest
feature a particular printer can create with its most accurate material, all other factors
being held constant
The name of the additive manufacturing process in which a liquid bonding agent is
selectively deposited to join powder material is: - ANSWER - Binder jetting
Which of the following terms is used to characterize the difference between the
dimensions of an as-printed part and the dimensions of a digital, as-designed (CAD)
part? - ANSWER - accuracy
Laser melting is a type of which of the following additive processes? - ANSWER -
Powder Bed Fusion
Which additive process involves the use of light to cure/harden a liquid polymer? -
ANSWER - Photopolymerization
Considering the process parameters controlling material flow in melt extrusion-based
systems, if you want to minimize the attachment/adhesion of support material at the
interface regions (between model and support material), assuming primary support
material, the best approach would be: - ANSWER - Make print/scan speed faster
when printing the interface regions than when printing anything else, all other
parameters stay the same
Your boss emails you the following picture and asks you how this object was made
using additive manufacturing. The part is made of a ceramic slurry. Which AM
process was most likely used to make this object? (see small scaffold image on
desktop) - ANSWER - Direct-write
True or False: Hot iso-static pressing (HIP) is a method for densifying metal parts
created with powder-based fusion processes. - ANSWER - True
In powder-bed fusion, a "Melt Flow Index" is used to help determine... - ANSWER - If
powder is reusable
Our guest speaker from Otterbox made which of the following important comments
about their ability to produce crystal clear, completely transparent parts? - ANSWER
- The can get transparent parts by polishing the printed part, but it only stays
transparent for a short while before yellowing.
This object was printed using melt extrusion. Your boss is in a hurry (as always) and
wants to keep costs down (as always). You are told the object will be stressed in
tension in unknown directions. Being aware of the time and cost needed to do
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