MEGR 3231 FINAL EXAM QUESTIONS
AND ANSWERS
What is CAD?
What are two types of CAD? - Correct Answers -Computer Aided Design
The implementation of computers in the creation. modification, analysis, and
optimization of a design.
Drafting and Modeling
What is CAM?
What are 3 types of CAM? - Correct Answers -Computer Aided Manufacturing
Application of computers to the creation and assembly of physical components.
NC - "Numerical control" of computer driven machine tools.
RP/AM - Rapid Prototyping / Additive Manufacture
CAPP - Computer Aided Process Planning
What is CAE?
What are 3 types of CAE? - Correct Answers -Computer Aided Engineering
FEA - Finite Element Analysis. Can be mechanical of thermal. The mechanical analysis
can be static or dynamic.
CFD - Computational Fluid Dynamics
Simulations.
CAD Research in the 50's - Correct Answers -CNC Programming
CAD Research in the 60's - Correct Answers -Sketchpad [Ivan Sutherland]
,Describe Sketchpad {Ivan Sutherland] - Correct Answers -Object oriented programming
Computer power was finally available
2D sketches
Horizontal and vertical line, arcs, zoom capability
More of computer aided drawing and drafting
CAD Research in the 70's - Correct Answers -Corporate Development
Computer Power Advances
(Super computers are room sized)
What were some CAD software companies in the 70's - Correct Answers --Unigraphics
-AutoTrol
-CATIA
-Computervision > Sun > Prime
CAD Research in the 80's - Correct Answers -Software Companies
What were some CAD software companies in the 80's - Correct Answers -Autodesk
Bentley
Dassault
Parametric Technology
What are the forms of 2D CAD? - Correct Answers -Raster
Vector
What are the forms of 3D CAD? - Correct Answers -Surface
Solid
Wireframe
What is raster?
1 bit and 3 bit - Correct Answers -A field of points that can be turned on and off with
different colors. The whole field presents a complete graphic. Think of it like an image.
(bitmap)
Depth of color depends on memory in bits per pixel.
1 bit (Monochrome)
Black or White, 1 on-off switch
3bit (Primaries)
Each pixel has 3 on-off switches
, **SCALING CAUSES DISTORTION**
What is vector? - Correct Answers -A set of simple geometric features with
mathematical features.
Can be scaled without distortion
Describe Electronic Engineering Drawings - Correct Answers -Allows for easier drawing
modification and duplication.
Simplifies the transfer of data
Reduce paper use [Not really though]
3D Wireframe Modeling - Correct Answers -A three dimensional vector graphic. The
components are defined geometric shapes where numerical values are assigned.
More of a 3D sketch
Composed of points and curves
No physical properties available
3D Surface Modeling - Correct Answers -Set of three dimensional primary elements
(points and curves)
Surfaces are created by combining these curves
Surfaces have no thickness so they are assumed to be solid only if it is a closed
volume.
No material properties
3D Solid Modeling - Correct Answers -Most are parametric based.
Entities created are retained as individual entities for later manipulation
A database is created for each model
Features contain the positive / negative aspect.
A hole and a cylinder have the same shape but a hole is a negative feature and a
cylinder is a positive one.
AND ANSWERS
What is CAD?
What are two types of CAD? - Correct Answers -Computer Aided Design
The implementation of computers in the creation. modification, analysis, and
optimization of a design.
Drafting and Modeling
What is CAM?
What are 3 types of CAM? - Correct Answers -Computer Aided Manufacturing
Application of computers to the creation and assembly of physical components.
NC - "Numerical control" of computer driven machine tools.
RP/AM - Rapid Prototyping / Additive Manufacture
CAPP - Computer Aided Process Planning
What is CAE?
What are 3 types of CAE? - Correct Answers -Computer Aided Engineering
FEA - Finite Element Analysis. Can be mechanical of thermal. The mechanical analysis
can be static or dynamic.
CFD - Computational Fluid Dynamics
Simulations.
CAD Research in the 50's - Correct Answers -CNC Programming
CAD Research in the 60's - Correct Answers -Sketchpad [Ivan Sutherland]
,Describe Sketchpad {Ivan Sutherland] - Correct Answers -Object oriented programming
Computer power was finally available
2D sketches
Horizontal and vertical line, arcs, zoom capability
More of computer aided drawing and drafting
CAD Research in the 70's - Correct Answers -Corporate Development
Computer Power Advances
(Super computers are room sized)
What were some CAD software companies in the 70's - Correct Answers --Unigraphics
-AutoTrol
-CATIA
-Computervision > Sun > Prime
CAD Research in the 80's - Correct Answers -Software Companies
What were some CAD software companies in the 80's - Correct Answers -Autodesk
Bentley
Dassault
Parametric Technology
What are the forms of 2D CAD? - Correct Answers -Raster
Vector
What are the forms of 3D CAD? - Correct Answers -Surface
Solid
Wireframe
What is raster?
1 bit and 3 bit - Correct Answers -A field of points that can be turned on and off with
different colors. The whole field presents a complete graphic. Think of it like an image.
(bitmap)
Depth of color depends on memory in bits per pixel.
1 bit (Monochrome)
Black or White, 1 on-off switch
3bit (Primaries)
Each pixel has 3 on-off switches
, **SCALING CAUSES DISTORTION**
What is vector? - Correct Answers -A set of simple geometric features with
mathematical features.
Can be scaled without distortion
Describe Electronic Engineering Drawings - Correct Answers -Allows for easier drawing
modification and duplication.
Simplifies the transfer of data
Reduce paper use [Not really though]
3D Wireframe Modeling - Correct Answers -A three dimensional vector graphic. The
components are defined geometric shapes where numerical values are assigned.
More of a 3D sketch
Composed of points and curves
No physical properties available
3D Surface Modeling - Correct Answers -Set of three dimensional primary elements
(points and curves)
Surfaces are created by combining these curves
Surfaces have no thickness so they are assumed to be solid only if it is a closed
volume.
No material properties
3D Solid Modeling - Correct Answers -Most are parametric based.
Entities created are retained as individual entities for later manipulation
A database is created for each model
Features contain the positive / negative aspect.
A hole and a cylinder have the same shape but a hole is a negative feature and a
cylinder is a positive one.
