# 460+ CAD-CAM and Automation Solved MCQs

Chapters

27
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Chapter: Computer Graphics
1.

## Which coordinate system is a device-dependent coordinate system?

A. World Coordinate System
B. Model Coordinate System
C. User Coordinate System
D. Screen Coordinate System
2.

## Which of the following is the default coordinate system?

A. User Coordinate System
B. World Coordinate System
C. Screen Coordinate System
D. None of the above
3.

## When every entity of a geometric model remains parallel to its initial position, the transformation is called as

A. User Coordinate System
B. World Coordinate System
C. Screen Coordinate System
D. None of the above
4.

## In which type of projection, actual dimensions and angles of objects and therefore shapes cannot be preserved?

A. User Coordinate System
B. World Coordinate System
C. Screen Coordinate System
D. None of the above
5.

## The matrix representation for translation in homogeneous coordinates is

A. User Coordinate System
B. World Coordinate System
C. Screen Coordinate System
D. None of the above
6.

A. P’=S*P
B. P’=R*P
C. P’=dx+dy
D. P’=S*S
7.

A. P’=T+P
B. P’=S*P
C. P’=R*P
D. P’=dx+dy
8.

## What is the use of homogeneous coordinates and matrix representation?

A. To treat all 3 transformations in a consistent way
B. To scale
C. To rotate
D. To shear the object
Answer» A. To treat all 3 transformations in a consistent way
9.

A. (x’, y’, z’)
B. (x, y, z)
C. (x’, y’, w’)
D. (x’, y’, w)
10.

A. 1
B. 0
C. -1
D. Any value
11.

## We can combine the multiplicative and translational terms for 2D into a single matrix representation by expanding

A. 2 x 2 matrix into 4x4 matrix
B. 2 x 2 matrix into 3 x 3
C. 3 x 3 matrix into 2 x 2
D. Only c
Answer» B. 2 x 2 matrix into 3 x 3
12.

## The general homogeneous coordinate representation can also be written as

A. (h.x, h.y, h.z)
B. (h.x, h.y, h)
C. (x, y, h.z)
D. (x,y,z)
13.

## In homogeneous coordinates value of ‘h’ is consider as 1 & it is called…..

A. Magnitude Vector
B. Unit Vector
C. Non-Zero Vector
D. Non-Zero Scalar Factor
14.

## Which co-ordinates allow common vector operations such as translation, rotation, scaling and perspective projection to be represented as a matrix by which the vector is multiplied?

A. vector co-ordinates
B. 3D co-ordinates
C. affine co-ordinates
D. homogenous co-ordinates
15.

## In Coordinates, a points in n-dimensional space is represent by (n+1) coordinates.

A. Scaling
B. Homogeneous
C. Inverse transformation
D. 3D Transformation
16.

## A translation is applied to an object by D

A. Repositioning it along with straight line path
B. Repositioning it along with circular path
C. Only b
D. All of the mentioned
Answer» A. Repositioning it along with straight line path
17.

## We translate a two-dimensional point by adding

A. Translation distances
B. Translation difference
C. X and Y
D. Only a
18.

## The translation distances (dx, dy) is called as

A. Translation vector
B. Shift vector
C. Both a and b
D. Neither a nor b
Answer» C. Both a and b
19.

## In 2D-translation, a point (x, y) can move to the new position (x’, y’) by using the equation

A. x’=x+dx and y’=y+dx
B. x’=x+dx and y’=y+dy
C. X’=x+dy and Y’=y+dx
D. X’=x-dx and y’=y-dy
20.

A. P’=P+T
B. P’=P-T
C. P’=P*T
D. P’=P
21.

## -------is a rigid body transformation that moves objects without deformation.

A. Rotation
B. Scaling
C. Translation
D. All of the mentioned
22.

A. P’=P+T
B. Dx and Dy
C. P’=P+P
D. Only c
23.

## Polygons are translated by adding to the coordinate position of each vertex and the current attribute setting.

A. Straight line path
B. Translation vector
C. Differences
D. Only b
24.

## To change the position of a circle or ellipse we translate

A. Center coordinates
B. Center coordinates and redraw the figure in new location
C. Outline coordinates
D. All of the mentioned
Answer» B. Center coordinates and redraw the figure in new location
25.

## The basic geometric transformations are

A. Translation
B. Rotation
C. Scaling
D. All of the mentioned
Answer» D. All of the mentioned
26.

## A two dimensional rotation is applied to an object by

A. Repositioning it along with straight line path
B. Repositioning it along with circular path
C. Only b
D. Any of the mentioned
27.

## To generate a rotation , we must specify

A. Rotation angle θ
B. Distances dx and dy
C. Rotation distance
D. All of the mentioned
28.

A. Rotation
B. Translation
C. Scaling
D. Shearing
29.

## Positive values for the rotation angle θ defines

A. Counter clockwise rotations about the end points
B. Counter clockwise translation about the pivot point
C. Counter clockwise rotations about the pivot point
D. Negative direction
30.

## The original coordinates of the point in polar coordinates are

A. X’=r cos (Ф +ϴ) and Y’=r cos (Ф +ϴ)
B. X’=r cos (Ф +ϴ) and Y’=r sin (Ф +ϴ)
C. X’=r cos (Ф -ϴ) and Y’=r cos (Ф -ϴ)
D. X’=r cos (Ф +ϴ) and Y’=r sin (Ф -ϴ)
Answer» B. X’=r cos (Ф +ϴ) and Y’=r sin (Ф +ϴ)
31.

## From the following, which one will require 4 matrices to multiply to get the final position?

B. Rotation about an arbitrary Point
C. Rotation about an arbitrary line
32.

A. Turn
B. Shift
C. Compression
D. Drag element
33.

## A line AB with end point A (2,3) & B (7,8) is to be rotated about origin by 300 in clockwise direction. Determine the coordinates of end points S of rotated line.

A. (3.232, 2.598)
B. (5.232, 3.598)
C. (3.232, 1.298)
D. (3.232, 1.598)
34.

## An ellipse can also be rotated about its center coordinates by rotating

A. End points
B. Major and minor axes
C. Only a
D. None
Answer» B. Major and minor axes
35.

A. Scaling
B. Rotation
C. Translation
D. Reflection
36.

## Scaling of a polygon is done by computing

A. The product of (x, y) of each vertex
B. (x, y) of end points
C. Center coordinates
D. Only a
37.

## We control the location of a scaled object by choosing the position is known as…………………………….

A. Pivot point
B. Fixed point
C. Differential scaling
D. Uniform scaling
38.

## If the scaling factors values sx and sy are assigned to the same value then………

A. Uniform rotation is produced
B. Uniform scaling is produced
C. Scaling cannot be done
D. Scaling can be done or cannot be done
Answer» B. Uniform scaling is produced
39.

## If the scaling factors values Sx and Sy are assigned to unequal values then

A. Uniform rotation is produced
B. Uniform scaling is produced
C. Differential scaling is produced
D. Scaling cannot be done
Answer» C. Differential scaling is produced
40.

## The objects transformed using the equation P’=S*P should be

A. Scaled
B. Repositioned
C. Both a and b
D. Neither a nor b
Answer» C. Both a and b
41.

## If the scaling factors values Sx and Sy < 1 then

A. It reduces the size of object
B. It increases the size of object
C. It stunts the shape of an object
D. None
Answer» A. It reduces the size of object
42.

## If the value of Sx=1 and Sy=1 then

A. Reduce the size of object
B. Distort the picture
C. Produce an enlargement
D. No change in the size of an object
Answer» D. No change in the size of an object
43.

## The polygons are scaled by applying the following transformation.

A. X’=x * Sx + Xf(1-Sx) & Y’=y * Sy + Yf(1-Sy)
B. X’=x * Sx + Xf(1+Sx) & Y’=y * Sy + Yf(1+Sy
C. X’=x * Sx + Xf(1-Sx) & Y’=y * Sy – Yf(1-Sy)
D. X’=x * Sx * Xf(1-Sx) & Y’=y * Sy * Yf(1-Sy)
Answer» A. X’=x * Sx + Xf(1-Sx) & Y’=y * Sy + Yf(1-Sy)
44.

A. True
B. False
45.

## If two pure reflections about a line passing through the origin are applied successively the result is

A. Pure rotation
B. Quarter rotation
C. Half rotation
D. True reflection
46.

A. 1
B. 0
C. -1
D. 2
47.

## Which of the following is NOT true? Image formed by reflection through a plane mirror is

A. of same size
B. same orientation
C. is at same distance from the mirror
D. virtual
48.

## Which of the following represents shearing?

A. (x, y) → (x+shx, y+shy)
B. (x, y) → (ax, by)
C. (x, y) → (x cos(θ)+y sin(θ), -x sin(θ)+y cos(θ))
D. (x, y) → (x+shy, y+shx)
Answer» D. (x, y) → (x+shy, y+shx)
49.

A. 2
B. 3
C. 6
D. 5
50.

A. 2
B. 3
C. 6
D. 5
51.

A. Selecting
B. Sorting
C. Scaling
D. Skewing
52.

A. True
B. False
53.

## Which of this is compulsory for 2D reflection?

A. Reflection plane.
B. Origin
C. Reflection axis
D. Co-ordinate axis.
54.

## Two successive translations are

A. Multiplicative
B. Inverse
C. Subtractive
55.

A. True
B. False
56.

## General pivot point rotation can be expressed as

A. T(zr,yr).R(θ).T(-zr,-yr) = R(xr,yr,θ)
B. T(xr,yr).R(θ).T(-xr,-yr) = R(xr,yr,θ)
C. T(xr,yr).R(θ).T(-xr,-yr) = R(zr,yr,θ)
D. T(xr,yr).R(θ).T(-xr,-yr) = R(zr,yr,θ)
57.

## Which of the following is NOT correct (A, B and C are matrices)

A. A∙B = B∙A
B. A∙B∙C = (A∙B) ∙C = A∙ (B∙C)
C. C(A+B) = C∙A + C∙B
D. 1 A = A 1
58.

A. 8
B. 9
C. 4
D. 6
59.

A. Rotation
B. Scaling up
C. Scaling down
D. Shearing
60.

## Transpose of a column matrix is

A. Zero matrix
B. Identity matrix
C. Row matrix
D. Diagonal matrix
61.

A. True
B. False
62.

A. 4
B. 3
C. 5
D. 6
63.

## The object space or the space in which the application model is defined is called

A. World co-ordinate system
B. Screen co-ordinate system
C. World window
D. Interface window
64.

## What is the name of the space in which the image is displayed?

A. World co-ordinate system
B. Screen co-ordinate system
C. World window
D. Interface window
65.

## What is the rectangle in the world defining the region that is to be displayed?

A. World co-ordinate system
B. Screen co-ordinate system
C. World window
D. Interface window
66.

## The window opened on the raster graphics screen in which the image will be displayed is called

A. World co-ordinate system
B. Screen co-ordinate system
C. World window
D. Interface window
67.

A. True
B. False
68.

A. True
B. False
69.

A. Roaming
B. Panning
C. Zooming
D. Tiling
70.

## By changing the dimensions of the viewport, the and of the objects being displayed can be manipulated.

A. Number of pixels and image quality
B. X co-ordinate and Y co-ordinate
C. Size and proportions
D. All of these
71.

A. True
B. False
72.

## Any convenient co-ordinate system or Cartesian co-ordinates which can be used to define the picture is called

A. spherical co-ordinates
B. vector co-ordinates
C. viewport co-ordinates
D. world co-ordinates
73.

A. D
B. 1/d
C. -d
D. -1/d
74.

## An area on a display device to which a window is mapped is called a………….

A. Window
B. Viewpoint
C. Pixel
D. None of the above
75.

## A Pixel is

A. a computer program that draws picture
B. A picture stored in secondary memory
C. The smallest resolvable part of a picture
D. All of the above
Answer» C. The smallest resolvable part of a picture
76.

## A system that automates the drafting process with interactive computer graphics is called

A. Computer Aided Engineering (CAE)
C. Computer Aided Manufacturing (CAM)
D. Computer Aided Instruction (CAI)
77.

## In which type of projection, actual dimensions and angles of objects and therefore shapes cannot be preserved?

A. Orthographic
B. Isometric
C. Perspective
D. None of the above
78.

## Coordinate of □ABCD is WCS are: lowermost corner A(2,2) & diagonal corner are C(8,6). W.r.t MCS. The coordinates of origin of WCS system are (5,4). If the axes of WCS are at 600 in CCW w.r.t. the axes of MCS. Find new vertices of point A in MCS.

A. (4.268, 6.732)
B. (5.268, 6.732)
C. (4.268, 4.732)
D. (6.268, 4.732)
79.

## A line AB with end points A (2, 1) & B (7, 6) is to be moved by 3 units in x-direction & 4 units in y-direction. Calculate new coordinates of points B.

A. (10, 2)
B. (2, 10)
C. (10, 10)
D. (10, 5)
Chapter: Geometric Modeling
80.

## QFor generating Coons patch we require

A. A set of grid points on surface
B. A set of control points
C. Four bounding curves defining surface
D. Two bounding curves and a set of grid control points
Answer» C. Four bounding curves defining surface
81.

A. (10, 10)
B. (15, 10)
C. (15, 15)
D. (10, 15)
82.

## In the following geometric modelling techniques which are not three-dimensional modelling?

A. Wireframe modelling
B. Drafting
C. Surface modelling
D. solid modelling
83.

## In the following three-dimensional modelling techniques. Which do not require much computer time and memory?

A. Surface modelling
B. Solid modelling
C. Wireframe modelling
D. All of the above
84.

## In the following geometric modelling techniques. which cannot be used for finite element analysis:

A. Wireframe modelling
B. Surface modelling
C. Solid modeling
D. none of the above
Answer» D. none of the above
85.

A. Box
B. Cone
C. Cylinder
D. Circle
86.

A. Line
B. Circle
C. Spline
D. Parabola
87.

## Which of the following is not a synthetic entity?

A. Hyperbola
B. Bezier curve
C. B-spline curve
D. Cubic spline curve
88.

A. Parabola
B. Ellipse
C. Hyperbola
D. Line
89.

A. 2
B. 1
C. 3
D. 4
90.

## The shape of Bezier curve is controlled by

A. Control points
B. Knots
C. End points
D. All the above
91.

## The curve that follows a convex hull property is:

A. Cubic spline
B. B-spline
C. Bezier curve
D. Both (b) and (c)
92.

A. n + 1
B. n - 1
C. n
D. 2n
93.

## The degree of the B-spline with varying knot vectors

A. Increases with knot vectors
B. Decreases with knot vectors
C. Remains constant
D. none of the above
Answer» A. Increases with knot vectors
94.

A. 4
B. 3
C. 2
D. 5
95.

A. 2
B. 1
C. 3
D. 4
96.

## In the bezier curve, the curve is always to first and last segments of the polygon

A. normal
B. parallel
C. tangent
D. none of the above
97.

## The unit vector in the direction of the line is defined as .

A. tangent vector+length of the line
B. tangent vector-length of the line
C. tangent vector/length of the line
D. length of the line/tangent vector
Answer» C. tangent vector/length of the line
98.

## From the following, which is an axisymmetric surface?

A. Plane Surface
B. Ruled Surface
C. Surface of Revolution
D. All of the above
99.

## curves allow local control of the curve

A. Analytical
B. Hermite cubic spline
C. Beizer
D. B-Spline
100.

## To determine the coefficients of the equation – two end-points and the two tangent vectors. This statement is true for which of the following

A. B-spline curve
B. Hermite Cubic Spline Curve
C. Beizer curve
D. none of the above
Answer» B. Hermite Cubic Spline Curve