CAD Modeling and AutoCAD Commands
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Questions and Answers

Which of the following is NOT a limitation of flowcharts?

  • Difficult to modify
  • Easy to read (correct)
  • Costly
  • Complexity

Which shape is typically used for blocks in a flowchart?

  • Circles
  • Pentagons
  • Squares or rectangles (correct)
  • Triangles

What does the XOR logic gate require to output ON?

  • At least one input ON
  • No inputs ON
  • Exactly one input ON (correct)
  • Both inputs ON

What is the entry point position for flowchart symbols?

<p>Top of the symbol (D)</p> Signup and view all the answers

What type of logic gate only requires one of its inputs to be ON to produce an output of ON?

<p>OR gate (B)</p> Signup and view all the answers

Which of the following electronic components is considered an analogue electronic component?

<p>Transistor (A)</p> Signup and view all the answers

Which of the following standards is associated with graphic symbols for logic functions in digital electronics?

<p>IEEE Std 91/9a (B)</p> Signup and view all the answers

What is the primary purpose of flowchart symbols?

<p>To represent various electrical functions and designs (A)</p> Signup and view all the answers

What is a wireframe model primarily composed of?

<p>Lines, circles, arcs, and/or plines (D)</p> Signup and view all the answers

What distinguishes a solid model from other types of models?

<p>It is the best possible computerized representation of a real object. (D)</p> Signup and view all the answers

What is required when using the RULESURF command to create a ruled surface?

<p>Ensure selected objects match at opposite ends (C)</p> Signup and view all the answers

Which system variables control the mesh density in a surface model?

<p>SURFTAB1 and SURFTAB2 (C)</p> Signup and view all the answers

What is the purpose of the '3D ARRAY' command?

<p>To generate a rectangular or polar array of objects (D)</p> Signup and view all the answers

What does the command 'PRESSPULL' enable the user to do?

<p>Extrude or press surfaces to create solids (A)</p> Signup and view all the answers

In CAD, what does the command 'REG' refer to?

<p>A 3D surface created from a closed polyline (C)</p> Signup and view all the answers

Which of the following commands is used to revolve an object around an axis?

<p>REVSURF (D)</p> Signup and view all the answers

Flashcards

Wireframe Model

A 3D representation of an object using lines, circles, or arcs along its edges.

Model (3D)

A full-sized, accurately positioned 3D object in relation to a coordinate system.

Surface Model

A 3D model with outer surfaces, like an object coated with a thin layer.

Mesh Density (Surface)

The control of lines/arcs for a surface's mesh using SURFTAB1 and SURFTAB2 system variables.

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Solid Model

The best computer representation of a real object. Includes volume.

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SUB

A command for subtracting one object from another in CAD.

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REV

A command for revolving an object around an axis in CAD.

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TABSURF

A command for creating a tabular surface in CAD.

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RULSURF

A command for creating a ruled surface in CAD.

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3D ARRAY (polar)

A command to create an array of objects arranged radially in a polar pattern.

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REVSURF

A command to create a surface by revolving an object around an axis.

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Region (3D)

A closed 3D surface, enclosed by a polyline, circle, ellipse, or spline.

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3D Mesh

A surface type created using XYZ coordinates on an XY mesh.

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RULESURF

A surface constructed that requires close matching of selecting ends.

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INPUT (CAD)

Materials, or data, provided as input into a CAD system.

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Block Diagram

A simplified graphical representation of a system, program, or process.

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Flowchart

A diagram that represents an algorithm, workflow, or process using shapes and arrows.

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Generalization

A leading relationship between blocks in a block diagram.

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Process

A series of actions or steps to achieve a specific outcome.

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Flowchart Symbols

Graphical representations used in a flowchart to depict different steps or processes.

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Flowchart Entry Point

The starting point for a particular process or step in a flowchart.

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Flowchart Exit Point

The point where a particular process or step in a flowchart concludes.

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Decision Symbol

A specific flowchart symbol used to represent a decision point/branching in a workflow.

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Logic Gates

Electronic switches for controlling the flow of electrical signals according to predetermined rules.

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NOT Gate

The simplest logic gate, inverting the input signal.

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AND Gate

Logic gate that only produces 'ON' when all inputs are 'ON'.

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OR Gate

Logic gate that produces 'ON' if at least one input is 'ON'.

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XOR Gate

Logic gate that produces 'ON' if one, but not both, inputs are 'ON'.

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Analog Electronics Components

Components used in analog circuits, often involving continuous signals like resistors, capacitors, inductors, diodes, and transistors.

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Flowchart Block Orientation

Flowchart blocks can be placed vertically and horizontally.

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Flowchart Block Shape

Flowchart blocks are usually squares (1:1 ratio) or rectangles (2:1 ratio).

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IEC 60617

International standard for electrical and electronic symbols for schematic diagrams.

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JIC

Joint Industrial Council standardization for flowcharting, particularly machine tool blueprints.

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ANSI Y32.3-1975

American National Standard for graphic symbols in technical drawings, related to electrical and electronic circuits and components.

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Study Notes

CAD Modeling

  • A wireframe model represents a 3D object using lines, circles, arcs, and plines along the object's edges.
  • A model is a 3D object drawn to full scale and accurately positioned in relation to a coordinate system.
  • A surface model has thin coatings on its outer surfaces.
  • Mesh density is controlled by SURFTAB1 and SURFTAB2 variables, which determine the rows and columns of the surface mesh.
  • A solid model is the most accurate representation of a real object.
  • Solid modeling commands include: subtract, revolve, tabular surface, ruled surface, box, press pull, extrude, line, 3D face, region.

AutoCAD Commands

  • REVSURF creates a revolved surface.
  • 3D ARRAY arranges objects in a rectangular or polar array.

3D Primitives

  • 3D solid primitives include wedges, boxes, spheres, tori, pyramids, and cones.

Diagram Types

  • Block diagrams simplify system processes.
  • Flowcharts illustrate algorithms and processes.

Logic Gates

  • NOT gates invert a signal.
  • AND gates require all inputs to be true for a true output.
  • OR gates need at least one input to be true for a true output.
  • XOR gates output true when only one input is true.

Analog Electronics Symbols

  • Symbols represent various electrical components like resistors, capacitors, inductors, diodes, transistors, and operational amplifiers.
  • International Standards (IEC) and ANSI provide standardized symbols.
  • Different standards like JIC (Joint Industrial Council) and IEEE might have different symbology.

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Description

Test your knowledge on CAD modeling concepts and AutoCAD commands. This quiz covers wireframe models, surface models, solid models, 3D primitives, and diagram types. Challenge yourself with questions on logic gates and essential modeling techniques.

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