This document contains questions and answers related to Computer Aided Drafting (CAD). It defines key CAD terms like AutoCAD, CAD, CADD and lists common CAD software packages. It describes the applications of CAD and shortcuts for common AutoCAD commands. The document also discusses CAD concepts like layers, blocks, arrays, rendering and perspectives. It provides standard paper sizes and outlines the model procedure for creating a CAD drawing in AutoCAD.

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COMPUTER AIDED DRAFTING LAB (Viva Questions)
1. What is meant by AutoCAD?
AutoCAD is one of the CAD system software introduced by Autodesk.
2. Mention some CAD packages?
 AUTOCAD
 STAAD
 3DsMax
 REVIT
 BEAMD
 STRAP
 MATLAB
 MS Project
 ETABS
 EPANET
3. What is the difference between CAD & CADD?
CAD - Computer Aided Design
CADD - Computer Aided Design and Drafting
4. What are the applications of CAD?
 Preparing Architectural drawing
 Interior design and modelling
 Tool and fixture design.
 Production planning and control.
 Preparing of assembly list and bill of material.
 Computer aided inspection.
 Preparation of programs for CNC machine.
 Circuit layout and panel drawing.
5. Define current UCS?
The User Co-ordinate System - Determines X,Y and Z axis.
6. What is. dwg?
The file extension and format for the standard AutoCAD drawing.
7. What is a hatch patterns?
A pattern of lines, dots and other shapes that fills in a closed area.
Command: H + Enter
Orphanage Polytechnic College, Edavanna

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8. What are the advantages of CAD?
 High Accuracy
 Speed
 Easy Editing
 Space effectiveness
 Scaling
 Better visualization
 Freedom from using Drawing instruments
9. Define block?
A block is simply a collection of objects that has a name. Blocks have several
advantages:
 You can insert them again and again, saving time.
 Can insert blocks into other drawings as well.
10.Shortcut keys for important commands
Line L Arc A
Circle C Polyline PL
Move M Ellipse EL
Copy CO Obj Snap F3
Hatch H Isoplane F5
Explode X Grid F7
Trim TR Ortho F8
Mirror MI Snap F9
Offset O Block B
Dimension style D Boundary BO
Text T
Construction
line
XL
Rotate RO Ray RAY
Fillet F Extrude EXT
Break BR Unit UN
Zoom Z Join J

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11.What is mean by ARRAY? What are types of ARRAYS?
To create multiple copies of selected objects and to arrange them in a pattern is called
an array. There are three types of arrays:
a) Rectangular
b) Path
c) Polar
12.What are Boolean operations in AutoCAD 3D?
a. UNION - Joins two or more solids objects
b. SUBSTRACT - Subtracts one or more solids from another
c. INTERSECTION – Creates a solid based on the intersected geometry
13.What are intelligent selection commands?
a. Fill
b. Purge
c. Filter
14.What is a layer?
Layers are the primary method for organizing the objects in a drawing by function or
purpose. Layers can reduce the visual complexity of a drawing and improve display
performance by hiding information that you don’t need to see at the moment.
15.What is mean by design centre?
Design Centre (DC) provides a way of quickly locating content such as drawing files,
block definitions, and hatches.
16.What is mean by isometric drawing?
All the vertical lines are drawn vertically but all horizontal lines are drawn at 30
degrees to the base line. It is also a method of 3D drawing in 2D plane.
17.What is mean by perspective drawing? What is difference b/w one point, two
point and three point perspectives?
A view in which objects are smaller as their distance from the observer increases.
1. One point perspective – one vanishing point (VP)
2. Two point perspective – 2 VP
3. Three point perspective – 3 VP
18.What is mean by SWEEP?
It creates a 3D solid object by sweeping a 2D figure along a path.

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19.What is mean by RENDER?
It creates a realistically shaded image of a three dimensional wireframe or solid model.
20.Define the following terms.
Software: A collection of computer programs, libraries and related data
Hardware: collection of physical parts of a computer system
Input device: Eg:- Keyboard, mouse, scanner, etc
Output device: Printer, Projector, Monitor, etc
Analysis: Details like Shear force, bending moment, deflection, etc
Design: Details like Reinforcement details
CAD/CAM: Computer-Aided Design and Computer-Aided Manufacturing
Project management: It is the discipline of initiating, planning, executing,
controlling, and closing the work of a team to achieve specific
goals and meet specific success criteria.
21. Standard paper sizes
22. Model procedure
1. Open AutoCAD 2016 and setup the CAD worksheet.
2. Set the units by typing UN + Enter
3. Using tools like LINE, PLINE, ARRAY, TRIM, OFFSET, etc complete the drawing
4. Add dimensions and detailing. Detailing is done using MULTILINE TEXT.
5. Elevations are plotted by extending lines from plan; sections drawn using extending lines from
elevation.
6. Specifications are added in detail using MULTILINE TEXT.
7. Save the drawing as PDF or plot it.
Think and modify procedures appropriately to the given question. All the best…
Paper Size
A0 841 x 1189
A1 594 x 841
A2 420 x 594
A3 297 x 420
A4 210 x 297