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MECH502 2024/2025 Exam Questions with Detailed
Verified Answers (100% Correct Answers) | Already
Graded A+
The terms "precision" and "resolution" are used interchangeably to refer to: -
(answers)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? -
(answers)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? - (answers)Cost per complexity,
Cost per quantity
True or False: Bioprinting usually uses a jetting process with a very fine spray of
material. - (answers)False
In the context of 3D digital modeling, what is a "manifold" model? - (answers)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... - (answers)A measure of the smallest
feature a particular printer can create with its most accurate material, all other
factors being held constant
, 2
The name of the additive manufacturing process in which a liquid bonding agent
is selectively deposited to join powder material is: - (answers)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? - (answers)accuracy
Laser melting is a type of which of the following additive processes? -
(answers)Powder Bed Fusion
Which additive process involves the use of light to cure/harden a liquid polymer?
- (answers)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: - (answers)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) - (answers)Direct-write
, 3
True or False: Hot iso-static pressing (HIP) is a method for densifying metal parts
created with powder-based fusion processes. - (answers)True
In powder-bed fusion, a "Melt Flow Index" is used to help determine... -
(answers)If powder is reusable
The slope of a photopolymer's working curve represents... - (answers)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) - (answers)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) - (answers)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? - (answers)Powder bed fusion
, 4
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) - (answers)Directed energy deposition
Which type of sintering is characterized by the coalescence of powder particles of
more than one material without full melting? - (answers)All of the above: Indirect
sintering, liquid phase sintering, chemically-induced sintering
Photopolymerization - (answers)can't print in color - brittle
cost of ownership - (answers)true cost - install +mat'l + initial cost+ disposale
buid vol vs bounding box - (answers)build vol - max size of printable volume for
printbounding box - smallest box size to fit a part inside
curing time - (answers)The length of time it takes for paint or varnish to "set" or
reach its ultimate, stable state.
foam vs lattice structure - (answers)random, stoic
-controllable
- stucture width posisty and heights etc
MECH502 2024/2025 Exam Questions with Detailed
Verified Answers (100% Correct Answers) | Already
Graded A+
The terms "precision" and "resolution" are used interchangeably to refer to: -
(answers)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? -
(answers)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? - (answers)Cost per complexity,
Cost per quantity
True or False: Bioprinting usually uses a jetting process with a very fine spray of
material. - (answers)False
In the context of 3D digital modeling, what is a "manifold" model? - (answers)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... - (answers)A measure of the smallest
feature a particular printer can create with its most accurate material, all other
factors being held constant
, 2
The name of the additive manufacturing process in which a liquid bonding agent
is selectively deposited to join powder material is: - (answers)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? - (answers)accuracy
Laser melting is a type of which of the following additive processes? -
(answers)Powder Bed Fusion
Which additive process involves the use of light to cure/harden a liquid polymer?
- (answers)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: - (answers)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) - (answers)Direct-write
, 3
True or False: Hot iso-static pressing (HIP) is a method for densifying metal parts
created with powder-based fusion processes. - (answers)True
In powder-bed fusion, a "Melt Flow Index" is used to help determine... -
(answers)If powder is reusable
The slope of a photopolymer's working curve represents... - (answers)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) - (answers)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) - (answers)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? - (answers)Powder bed fusion
, 4
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) - (answers)Directed energy deposition
Which type of sintering is characterized by the coalescence of powder particles of
more than one material without full melting? - (answers)All of the above: Indirect
sintering, liquid phase sintering, chemically-induced sintering
Photopolymerization - (answers)can't print in color - brittle
cost of ownership - (answers)true cost - install +mat'l + initial cost+ disposale
buid vol vs bounding box - (answers)build vol - max size of printable volume for
printbounding box - smallest box size to fit a part inside
curing time - (answers)The length of time it takes for paint or varnish to "set" or
reach its ultimate, stable state.
foam vs lattice structure - (answers)random, stoic
-controllable
- stucture width posisty and heights etc
