MAE 1351 EXAM 2 SOLVED QUIZZES & ANSWERS, Exams of Nursing

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MAE 1351 EXAM 2 SOLVED QUIZZES & ANSWERS

ECHO 360 and Module Quizzes Answer- ECHO 360 and Module Quizzes An assembly cannot be nested inside an existing assembly; only parts can Answer- False I bring a part into an assembly in SolidWorks, and click the OK check mark at the top right. This will.. Answer- leave the part in a floating state; align component with the assembly origin I bring a cube into an assembly and mate-coincident one of its edges to a fixed edge. It now has how many DOF's Answer- 2 Every part brought/ made in SolidWorks has how many DOF's Answer- 6 When you apply mates to an object in SolidWorks, what are you technically doing? Answer- Taking away DOF's each time a mate/constraint is applied I bring a cube into an assembly and mate coincident one of its vertices to a fixed vertex. It now has how many DOF's Answer- 3 For every mate I apply, I reduce the DOF of the part by these many Answer- Depends on the mate I bring a cylinder into an assembly and mate-parallel one of its flat faces to the top of the plane. This causes it to lose these many DOFs Answer- 3 I bring a cylinder into an assembly and mate-tangent its curved to a curved surface of a fixed identical cylinder. It now has how many DOF's Answer- 3 The equivalent of mass in a rotational system is called the Answer- moment of inertia I have an assembly with moving parts and wish to check that I have part clearances throughout. For this I need. Answer- Motion Study In a SolidWorks assembly, it is possible to assign an arbitrary motion to a component to visualize overall behavior Answer- yes, easily In a FEA simulation, certain physical values are specified at their edges and nodal points. These are known as Answer- Boundary conditions

In a FEA simulation, certain physical values (displacement, temperature) are specified at their edges and nodal points. These are known as Answer- They are NOT known as: Clamping values Limit values Differential Equations Chapter 7 Notes Answer- Chapter 7 Notes Components Answer- objects that make up a system Instances Answer- copies of a component within the system Subassembly Answer- is a grouping of components that serves a single purpose within the overall assembly; subassemblies can also be instances. They can also contain other subassembely instances Associativity Answer- you can change the geometry of a part of a component and all instances of it will also change by the same amount Base instance Answer- is a component that remains stationary while the other instances move around it Assembly constraints Answer- a constraint between two 3-D instances so that the instances maintain dimensional or geometric relationships with respect to each other within the assembly DOF Answer- degree of freedom; distance along X,Y,Z from the instance origin to the base component origin Concentric Constraints Answer- you can constrain the centerline of one instance to coincide with the centerline of a different instance forcing the two instances to be concentric Surface normal Answer- a vector that is perpendicular to the surface and points away from it Mating surfaces tend to do what with each other Answer- Coincide- they line up on top of each other Mating surfaces constraints Answer- when you are applying a mating surface constraint you are forcing normals of the two surfaces to be parallel to each other Coincidence Answer- two entities that take up the same space Coincidence constraints Answer- can occur between two lines, two points, or between a point and a line Interference Answer- the amount that two instances overlap

Clearances Answer- the minimum distance between two parts If two parts overlap, there is an interference and a clearance is not defined Answer- If two parts have a clearance, an interference is not defined Chapter 8 Notes Answer- Chapter 8 Notes Center of mass Answer- help increase an objects stability Inertial properties Answer- radii of gyration moments of inertia principal axes of rotation products of inertia Measure point Answer- a command that returns the coordinates X,Y,Z of a specific point on a sketch or model; or a command that can interpolate between two defined points to return the coordinates of a point that is halfway between two defined points Measure line length Answer- a command that returns the length of a line; does not have to be a specific edge on the model Measure line distance Answer- a command that returns the shortest perpendicular distance between a line and another entity Measure circle Answer- a command that returns the center and diameter of a circle Measure arc Answer- a command that returns the center and radius of an arc Measure surface Answer- a command that returns the area of a specified surface and the length of the perimeter surrounding that surface Mass properties Answer- are the static properties of a solid body that depends on: geometry of the part objects density Density Answer- is the weight per unit volume for the material that the part is made from Mass Answer- is the measure of the body's property to resist change in its steady motion depends on volume of body and density of material Volume Answer- is the total volume of space enclosed by the body's boundary surfaces Surface Area Answer- is the total area of the boundary surfaces defining the solid

Center Mass or Centroid Answer- is the origin of coordinate axes for which the first moment is zero. it is considered the center of a volume... Principal axes of Inertia and Principal moments of inertia Answer- are extreme moments of inertia for a body. They are associated with principal axes of inertia that have their origin at the centroid and direction is given by the 3 vector components Moments of Inertia Answer- is the second moment of mass of a body relative to an axis usually X,Y,Z. It is a measure of the body's property to resist change in its steady rotation about the axis. It depends on the body's mass and distribution around the axis Radius of gyration Answer- is the distance from the axis of interest where all of the mass can be concentrated while still yielding the same moment of inertia Finite Element Analysis (FEA) Answer- is an advanced design analysis technique that divides objects into smaller elements in order to analyze them. is able to solve all types of stresses and deformations an object experiences Mechanical stresses Answer- objects that are subjected to loads will experience this Fluid flow and Pressure fields Answer- is used to compute the airflow around airplane wings and can also determine air pressure fields can also predict and alter the way fluid flows Thermal flow and Temperature Answer- can also be solved using FEA it is important to know how temperature flows because it may affect the performance of an object Electromagnetic fields Answer- when electricity flows through a wire, an electromagnetic field is created is important to understand because it can affect performance of an object Meshing Answer- the process of subdividing solid elements the smaller the elements the more accurate the solution Boundary Conditions Answer- are specified at nodal points and along the elements edge Finite Element Analysis Process Answer- 1. Creating the model geometry 2. applying constraints

3. applying loads
4. meshing
5. computing the results 6. investigating the results 7.

modifying the design displacement Answer- A change in the location of points on an object after is has been subjected to external loads.

constraint Answer- A boundary condition applied to a finite element model to prevent it from moving through space