MECH502 2024/2025 Exam Questions with Verified
Answers (Questions 1-200)
Instructions
• Correct Answers are in Bold Italics
• Rationales are in Italic based on verified course content
• Questions cover Additive Manufacturing principles, processes, and applications
1. The terms "precision" and "resolution" are used interchangeably in 3D printing
to refer to:
A. The accuracy of the printer's movement system
B. The smallest feature that a particular 3D printer can print, independent of any
particular material
C. The layer height of the printed part
D. The tolerance of the final part
Correct Answer: B. The smallest feature that a particular 3D printer can print,
independent of any particular material.
Rationale: Resolution/precision defines the minimum printable feature size that the
machine hardware can achieve, separate from material properties or other process
variables. This is a fundamental specification of the printer's capabilities .
2. In the context of 3D digital modeling, what is a "manifold" model?
A. A model with multiple surfaces
B. A model that is completely closed between the inside of the model and the outside
C. A model with complex geometry
D. A model with no support structures
,Correct Answer: B. 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.
Rationale: A manifold model has no holes or gaps in its surface mesh, ensuring watertight
geometry suitable for 3D printing. This means the interior and exterior are clearly defined
with no open edges .
3. The term "Dynamic precision" refers to:
A. The printer's maximum build volume
B. The printer's maximum speed
C. A measure of the smallest feature a particular printer can create with its most
accurate material, all other factors being held constant
D. The accuracy of the printer's calibration
Correct Answer: C. A measure of the smallest feature a particular printer can create
with its most accurate material, all other factors being held constant.
Rationale: Dynamic precision accounts for real-world performance with specific materials,
unlike static resolution specifications. It represents the practical limit of printable features .
4. Which term is used to characterize the difference between the dimensions of an
as-printed part and the dimensions of a digital, as-designed (CAD) part?
A. Resolution
B. Precision
C. Accuracy
D. Tolerance
Correct Answer: C. Accuracy.
Rationale: Accuracy measures the dimensional deviation between the printed part and the
intended CAD model. This differs from precision, which refers to the smallest feature size
the printer can produce .
,5. Build volume vs. bounding box is best described as:
A. Build volume is the printer's physical size; bounding box is the packaging size
B. Build volume is the maximum size of printable volume for the printer; bounding box is
the smallest box size needed to fit a part inside
C. Build volume is the usable area; bounding box is the total area
D. Build volume and bounding box are the same thing
Correct Answer: B. Build volume is the maximum size of printable volume for the
printer; bounding box is the smallest box size needed to fit a part inside.
Rationale: Build volume represents the printer's maximum printable dimensions. Bounding
box is the minimum rectangular volume required to contain a specific part, which helps
determine if a part fits within the build volume .
6. 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?
A. Cost, speed, and availability
B. Purpose of part (e.g., functional requirements), material requirements, and size of part
C. Color, finish, and weight
D. Brand, model, and software compatibility
Correct Answer: B. Purpose of part (e.g., functional requirements), material
requirements, and size of part.
Rationale: The primary considerations for selecting an additive manufacturing process are
the part's intended function, material requirements (mechanical properties, thermal
resistance), and physical size constraints. These factors determine which AM technology is
most suitable .
7. 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?
, A. Cost per part, production speed
B. Cost per complexity, cost per quantity
C. Material availability, post-processing requirements
D. Machine cost, labor cost
Correct Answer: B. Cost per complexity, cost per quantity.
Rationale: Additive manufacturing excels when part complexity increases (cost per
complexity remains low) and when production quantities are low (cost per quantity
remains manageable). This helps determine if AM or traditional manufacturing is more
economical .
8. True or False: Bioprinting usually uses a jetting process with a very fine spray of
material.
A. True
B. False
Correct Answer: B. False.
Rationale: Bioprinting typically uses extrusion-based or droplet-based methods to deposit
bio-inks, not a fine spray of material. Jetting processes like inkjet printing can be used, but
are not the primary mechanism in most bioprinting applications .
9. The name of the additive manufacturing process in which a liquid bonding
agent is selectively deposited to join powder material is:
A. Powder Bed Fusion
B. Binder Jetting
C. Material Jetting
D. Vat Photopolymerization
Correct Answer: B. Binder Jetting.
Answers (Questions 1-200)
Instructions
• Correct Answers are in Bold Italics
• Rationales are in Italic based on verified course content
• Questions cover Additive Manufacturing principles, processes, and applications
1. The terms "precision" and "resolution" are used interchangeably in 3D printing
to refer to:
A. The accuracy of the printer's movement system
B. The smallest feature that a particular 3D printer can print, independent of any
particular material
C. The layer height of the printed part
D. The tolerance of the final part
Correct Answer: B. The smallest feature that a particular 3D printer can print,
independent of any particular material.
Rationale: Resolution/precision defines the minimum printable feature size that the
machine hardware can achieve, separate from material properties or other process
variables. This is a fundamental specification of the printer's capabilities .
2. In the context of 3D digital modeling, what is a "manifold" model?
A. A model with multiple surfaces
B. A model that is completely closed between the inside of the model and the outside
C. A model with complex geometry
D. A model with no support structures
,Correct Answer: B. 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.
Rationale: A manifold model has no holes or gaps in its surface mesh, ensuring watertight
geometry suitable for 3D printing. This means the interior and exterior are clearly defined
with no open edges .
3. The term "Dynamic precision" refers to:
A. The printer's maximum build volume
B. The printer's maximum speed
C. A measure of the smallest feature a particular printer can create with its most
accurate material, all other factors being held constant
D. The accuracy of the printer's calibration
Correct Answer: C. A measure of the smallest feature a particular printer can create
with its most accurate material, all other factors being held constant.
Rationale: Dynamic precision accounts for real-world performance with specific materials,
unlike static resolution specifications. It represents the practical limit of printable features .
4. Which term is used to characterize the difference between the dimensions of an
as-printed part and the dimensions of a digital, as-designed (CAD) part?
A. Resolution
B. Precision
C. Accuracy
D. Tolerance
Correct Answer: C. Accuracy.
Rationale: Accuracy measures the dimensional deviation between the printed part and the
intended CAD model. This differs from precision, which refers to the smallest feature size
the printer can produce .
,5. Build volume vs. bounding box is best described as:
A. Build volume is the printer's physical size; bounding box is the packaging size
B. Build volume is the maximum size of printable volume for the printer; bounding box is
the smallest box size needed to fit a part inside
C. Build volume is the usable area; bounding box is the total area
D. Build volume and bounding box are the same thing
Correct Answer: B. Build volume is the maximum size of printable volume for the
printer; bounding box is the smallest box size needed to fit a part inside.
Rationale: Build volume represents the printer's maximum printable dimensions. Bounding
box is the minimum rectangular volume required to contain a specific part, which helps
determine if a part fits within the build volume .
6. 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?
A. Cost, speed, and availability
B. Purpose of part (e.g., functional requirements), material requirements, and size of part
C. Color, finish, and weight
D. Brand, model, and software compatibility
Correct Answer: B. Purpose of part (e.g., functional requirements), material
requirements, and size of part.
Rationale: The primary considerations for selecting an additive manufacturing process are
the part's intended function, material requirements (mechanical properties, thermal
resistance), and physical size constraints. These factors determine which AM technology is
most suitable .
7. 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?
, A. Cost per part, production speed
B. Cost per complexity, cost per quantity
C. Material availability, post-processing requirements
D. Machine cost, labor cost
Correct Answer: B. Cost per complexity, cost per quantity.
Rationale: Additive manufacturing excels when part complexity increases (cost per
complexity remains low) and when production quantities are low (cost per quantity
remains manageable). This helps determine if AM or traditional manufacturing is more
economical .
8. True or False: Bioprinting usually uses a jetting process with a very fine spray of
material.
A. True
B. False
Correct Answer: B. False.
Rationale: Bioprinting typically uses extrusion-based or droplet-based methods to deposit
bio-inks, not a fine spray of material. Jetting processes like inkjet printing can be used, but
are not the primary mechanism in most bioprinting applications .
9. The name of the additive manufacturing process in which a liquid bonding
agent is selectively deposited to join powder material is:
A. Powder Bed Fusion
B. Binder Jetting
C. Material Jetting
D. Vat Photopolymerization
Correct Answer: B. Binder Jetting.
