MAE 1351 EXAM 2 QUESTIONS AND
ANSWERS. VERIFIED 2025/2026.
Component - ANS computer generated parts that make up a system
Instances - ANS copies of a component w/in a system(assembly)
An assembly cannot be nested inside an existing assembly; only parts can. - ANS False
What are the benefits of an assembly - ANS - makes it easier to modify a part and propagate
within the assembly
- saves computer memory
Associativity - ANS if the geometry of a part is changed then the components and instances
of that part will also change by the same amount.
Parent-Child Relationships - ANS Associations between components and subassemblies
Parent-subassembly
Child- component
base instance - ANS The instance chosen to orient other instances in space relative to itself
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
,-they are stationary
What is the difference between Top-Down and Down-Up Hierarchy - ANS Top -Down:
breaking the assembly down to its components
Down-Up: Building the assembly from its components to its assembly final form
What purpose do reference planes serve for an assembly - ANS they connect to base
component and serve as the coordinate planes for the space defined by the system
Assembly Constraints - ANS dimensional and geometric constraints between 2 3D instances
so the instances maintain their geometric/dimensional relationships w/respect to each other
w/in the assembly.
Degrees of Freedom - ANS a quantity used to represent the location and orientation of a part
in 3D space
I bring a part into an assembly in SW and click the OK check mark in the top right. This will... -
ANS Align component origin with assembly origin
I bring a cube into an assembly and mate-coincident one of its edges to a fixed edge. It now has
these many DOFs: - ANS 2
I bring a cube into an assembly and mate-coincident one of its vertices to a fixed vertex. It now
has these many DOFs: - ANS 3
For every mate I apply, I reduce the DOF of the part by these many: - ANS Depends on the
mate
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, I bring a cylinder into an assembly and mate-parallel one of its flat faces to the top plane. This
causes it to lose these many DOFs: - ANS 2
Mechanical Mates - ANS Applies to mechanisms when there is a programmatic motion btw 2
components meaning it doesn't happen naturally from other geometrical constraints
Orientated towards power transmission
Do you want your system fully constrained - ANS NO because the assembly will be rigid and
unable to move and will revert to its original orientation to satisfy all of the constraints if you try
to move an instance.
I bring a cylinder into an assembly and mate-tangent its curved surface to the curved surface of
a fixed, identical cylinder. It now has these many DOFs: - ANS 3
The equivalent of mass in a rotational system is called the... - ANS moment of inertia
I have an assembly with moving parts and wish to check that I have part clearances throughout.
For this I need... - ANS Motion study
Center-Of-Mass - ANS a physical property of a 3D solid model used to help increase the
device's stability
Measurement Analysis - ANS determines the dimensions and other geometric parameters of
a CAD model
Moment of inertia - ANS Large Diameter = harder to accelerate to desired rotation rate
Larger moment of inertia = higher torque force to accelerate to desired rotation rate
3 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
ANSWERS. VERIFIED 2025/2026.
Component - ANS computer generated parts that make up a system
Instances - ANS copies of a component w/in a system(assembly)
An assembly cannot be nested inside an existing assembly; only parts can. - ANS False
What are the benefits of an assembly - ANS - makes it easier to modify a part and propagate
within the assembly
- saves computer memory
Associativity - ANS if the geometry of a part is changed then the components and instances
of that part will also change by the same amount.
Parent-Child Relationships - ANS Associations between components and subassemblies
Parent-subassembly
Child- component
base instance - ANS The instance chosen to orient other instances in space relative to itself
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
,-they are stationary
What is the difference between Top-Down and Down-Up Hierarchy - ANS Top -Down:
breaking the assembly down to its components
Down-Up: Building the assembly from its components to its assembly final form
What purpose do reference planes serve for an assembly - ANS they connect to base
component and serve as the coordinate planes for the space defined by the system
Assembly Constraints - ANS dimensional and geometric constraints between 2 3D instances
so the instances maintain their geometric/dimensional relationships w/respect to each other
w/in the assembly.
Degrees of Freedom - ANS a quantity used to represent the location and orientation of a part
in 3D space
I bring a part into an assembly in SW and click the OK check mark in the top right. This will... -
ANS Align component origin with assembly origin
I bring a cube into an assembly and mate-coincident one of its edges to a fixed edge. It now has
these many DOFs: - ANS 2
I bring a cube into an assembly and mate-coincident one of its vertices to a fixed vertex. It now
has these many DOFs: - ANS 3
For every mate I apply, I reduce the DOF of the part by these many: - ANS Depends on the
mate
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, I bring a cylinder into an assembly and mate-parallel one of its flat faces to the top plane. This
causes it to lose these many DOFs: - ANS 2
Mechanical Mates - ANS Applies to mechanisms when there is a programmatic motion btw 2
components meaning it doesn't happen naturally from other geometrical constraints
Orientated towards power transmission
Do you want your system fully constrained - ANS NO because the assembly will be rigid and
unable to move and will revert to its original orientation to satisfy all of the constraints if you try
to move an instance.
I bring a cylinder into an assembly and mate-tangent its curved surface to the curved surface of
a fixed, identical cylinder. It now has these many DOFs: - ANS 3
The equivalent of mass in a rotational system is called the... - ANS moment of inertia
I have an assembly with moving parts and wish to check that I have part clearances throughout.
For this I need... - ANS Motion study
Center-Of-Mass - ANS a physical property of a 3D solid model used to help increase the
device's stability
Measurement Analysis - ANS determines the dimensions and other geometric parameters of
a CAD model
Moment of inertia - ANS Large Diameter = harder to accelerate to desired rotation rate
Larger moment of inertia = higher torque force to accelerate to desired rotation rate
3 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
