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UNIT No- 01 Name of Unit: COMPUTER GRAPHICSQ 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 Answer D Q Which of the following is the default coordinate system? A User Coordinate ...

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CAD/CAM & AUTOMATION [Multiple Choice Questions] Name of Unit: COMPUTER GRAPHICS

UNIT No-01 Q.1

Q.2

Which coordinate system is a device-dependent coordinate system? World Coordinate System Model Coordinate System User Coordinate System

D Answer

Screen Coordinate System D

Which of the following is the default coordinate system?

Q.3

Q.4

A B C

A B

User Coordinate System World Coordinate System

C D Answer

Screen Coordinate System None of the above B

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 Answer B 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 D Answer

Q.5

The matrix representation for translation in homogeneous coordinates is A

Q.6

KKWIEER

Screen Coordinate System None of the above B User Coordinate System

B World Coordinate System C Screen Coordinate System D None of the above Answer B The matrix representation for scaling in homogeneous coordinates is A P’=S*P P’=R*P B C P’=dx+dy D P’=S*S Answer A Mechanical Engineering Department

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CAD/CAM & AUTOMATION [Multiple Choice Questions] Name of Unit: COMPUTER GRAPHICS

UNIT No-01 Q.7

Q.8

The two-dimensional rotation equation in the matrix form is P’=T+P A B P’=S*P C P’=R*P P’=dx+dy D Answer C What is the use of homogeneous coordinates and matrix representation? A B C

Q.9

To treat all 3 transformations in a consistent way To scale To rotate

D To shear the object Answer A If point are expressed in homogeneous coordinates then the pair of (x, y) is represented as A (x’, y’, z’) B (x, y, z) (x’, y’, w’) C D (x’, y’, w) Answer D

Q.10

For 2D transformation the value of third coordinate i.e. w (or h) =? A 1 B 0 C -1 D Any value Answer A

Q.11

We can combine the multiplicative and translational terms for 2D into a single

Q.12

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 The general homogeneous coordinate representation can also be written as A B

Q.13

KKWIEER

(h.x, h.y, h.z) (h.x, h.y, h)

C (x, y, h.z) D (x,y,z) Answer B In homogeneous coordinates value of ‘h’ is consider as 1 & it is called….. A Magnitude Vector Mechanical Engineering Department

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CAD/CAM & AUTOMATION [Multiple Choice Questions] Name of Unit: COMPUTER GRAPHICS

UNIT No-01 B C D Answer Q.14

Q.15

Unit Vector Non-Zero Vector Non-Zero Scalar Factor D

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 Answer In

homogenous co-ordinates D Coordinates, a points in n-dimensional space is represent by

(n+1) coordinates. A Scaling B Homogeneous C Inverse transformation D 3D Transformation Answer B Q.16

Q.17

Q.18

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 We translate a two-dimensional point by adding A Translation distances B Translation difference C X and Y D Only a Answer D The translation distances (dx, dy) is called as A B

Q.19

Translation vector Shift vector

C Both a and b D Neither a nor b Answer C 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

KKWIEER

Mechanical Engineering Department

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CAD/CAM & AUTOMATION [Multiple Choice Questions] Name of Unit: COMPUTER GRAPHICS

UNIT No-01 B C D Answer

x’=x+dx and y’=y+dy X’=x+dy and Y’=y+dx X’=x-dx and y’=y-dy B

Q.20

The two-dimensional translation equation in the matrix form is P’=P+T A B P’=P-T P’=P*T C P’=P D Answer A

Q.21

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

Q.22

Q.23

B Scaling C Translation D All of the mentioned Answer C A straight line segment is translated by applying the transformation equation A P’=P+T B Dx and Dy C P’=P+P D Only c Answer A 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 D Answer

Q.24

Q.25

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 The basic geometric transformations are A B C D

KKWIEER

Differences Only b D

Translation Rotation Scaling All of the mentioned Mechanical Engineering Department

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CAD/CAM & AUTOMATION [Multiple Choice Questions] Name of Unit: COMPUTER GRAPHICS

UNIT No-01 Answer Q.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 D Answer

Q.27

Q.28

C Rotation distance D All of the mentioned Answer A The rotation axis that is perpendicular to the xy plane and passes through the pivot point is known as A Rotation Translation Scaling

D Shearing Answer A 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 D Answer

Q.30

Only b Any of the mentioned C

To generate a rotation , we must specify Rotation angle θ A B Distances dx and dy

B C

Q.29

D

Counter clockwise rotations about the pivot point Negative direction C

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

Q.31 From the following, which one will require 4 matrices to multiply to get the final position? A B C D Answer Q.32 KKWIEER

Rotation about the origin Rotation about an arbitrary Point Rotation about an arbitrary line Scaling about the origin B

Rotation is simply---------object w.r.t origin or centre point. A Turn Mechanical Engineering Department

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CAD/CAM & AUTOMATION [Multiple Choice Questions] Name of Unit: COMPUTER GRAPHICS

UNIT No-01

Q.33

B Shift C Compression D Drag element Answer A 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 B C

Q.34

D (3.232, 1.598) Answer D An ellipse can also be rotated about its center coordinates by rotating A B C

Q.35

Q.37

End points Major and minor axes Only a

D None Answer B The transformation that is used to alter the size of an object is A B C

Q.36

(3.232, 2.598) (5.232, 3.598) (3.232, 1.298)

Scaling Rotation Translation

D Reflection Answer A 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 Answer D We control the location of a scaled object by choosing the position is known as……………………………. A Pivot point

Q.38

KKWIEER

B Fixed point C Differential scaling D Uniform scaling Answer B 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 Mechanical Engineering Department

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CAD/CAM & AUTOMATION [Multiple Choice Questions] Name of Unit: COMPUTER GRAPHICS

UNIT No-01 C D Answer Q.39

Q.40

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 The objects transformed using the equation P’=S*P should be A Scaled B Repositioned C D Answer

Q.41

Q.42

Q.43

Q.44

Both a and b Neither a nor b C

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 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 The polygons are scaled by applying the following transformation. X’=x * Sx + Xf(1-Sx) & Y’=y * Sy + Yf(1-Sy) A 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) X’=x * Sx * Xf(1-Sx) & Y’=y * Sy * Yf(1-Sy) D Answer A Reflection is a special case of rotation. A B Answer

Q.45

Scaling cannot be done Scaling can be done or cannot be done B

True False B

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

KKWIEER

Mechanical Engineering Department

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CAD/CAM & AUTOMATION [Multiple Choice Questions] Name of Unit: COMPUTER GRAPHICS

UNIT No-01 B C D Answer Q.46

Q.47

Quarter rotation Half rotation True reflection A

What is the determinant of the pure reflection matrix? A 1 B 0 C -1 D 2 Answer C Which of the following is NOT true? Image formed by reflection through a plane mirror is

Q.48

Q.49

Q.50

A

of same size

B C

same orientation is at same distance from the mirror

D virtual Answer B Which of the following represents shearing? (x, y) → (x+shx, y+shy) A B (x, y) → (ax, by) C (x, y) → (x cos(θ)+y sin(θ), -x sin(θ)+y cos(θ)) (x, y) → (x+shy, y+shx) D Answer D If a ‘3 x 3’ matrix shears in X direction, how many elements of it are ‘1’? A 2 B 3 C 6 D 5 Answer B If a ‘3 x 3’ matrix shears in Y direction, how many elements of it are ‘0’? A

Q.51

KKWIEER

2

B 3 C 6 D 5 Answer D Shearing is also termed as A Selecting B Sorting Mechanical Engineering Department

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CAD/CAM & AUTOMATION [Multiple Choice Questions] Name of Unit: COMPUTER GRAPHICS

UNIT No-01

Q.52

C Scaling D Skewing Answer D Shearing and reflection are types of translation. A B Answer

Q.53

Q.54

Q.55

True False B

Which of this is compulsory for 2D reflection? A Reflection plane. B Origin C Reflection axis D Co-ordinate axis. Answer C Two successive translations are A Multiplicative B Inverse C Subtractive D Additive Answer D Two successive translations are commutative. A B Answer

True False A

Q.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) T(xr,yr).R(θ).T(-xr,-yr) = R(zr,yr,θ) C D T(xr,yr).R(θ).T(-xr,-yr) = R(zr,yr,θ) Answer B

Q.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(A+B) = C∙A + C∙B C D 1A=A1 Answer A

Q.58

Reflection about the line y=0, the axis, is accomplished with the transformation matrix with how many elements as ‘0’? A 8 B C

KKWIEER

9 4 Mechanical Engineering Department

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CAD/CAM & AUTOMATION [Multiple Choice Questions] Name of Unit: COMPUTER GRAPHICS

UNIT No-01

Q.59

D 6 Answer D Which transformation distorts the shape of an object such that the transformed shape appears as if the object were composed of internal layers that had been caused to slide over each other? A B C

Q.60

Q.61

Q.62

Q.63

Q.64

Q.65 KKWIEER

Rotation Scaling up Scaling down

D Shearing Answer D Transpose of a column matrix is A Zero matrix B Identity matrix C Row matrix D Diagonal matrix Answer C Reversing the order in which a sequence of transformations is performed may affect the transformed position of an object. A True B False Answer A How many minimum numbers of zeros are there in ‘3 x 3’ triangular matrix? A 4 B 3 C 5 D 6 Answer B 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 Answer A 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 Answer B What is the rectangle in the world defining the region that is to be displayed? Mechanical Engineering Department

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CAD/CAM & AUTOMATION [Multiple Choice Questions] Name of Unit: COMPUTER GRAPHICS

UNIT No-01

Q.66

A World co-ordinate system B Screen co-ordinate system C World window D Interface window Answer C The window opened on the raster graphics screen in which the image will be

Q.67

displayed is called A World co-ordinate system B Screen co-ordinate system C World window D Interface window Answer D The process of mapping a world window in World Coordinates to the Viewport is called Viewing transformation.

Q.68

A

True

B

False

Answer

A

Panning is a technique in which users can change the size of the area to be viewed in order to see more detail or less detail. A

True

B

False

Answer

B

Q.69 Drawing of number of copies of the same image in rows and columns across the interface window so that they cover the entire window is called A Roaming B Panning C Zooming

Q.70

D Tiling Answer D By changing the dimensions of the viewport, the the objects being displayed can be manipulated. A B C

Q.71 KKWIEER

and

of

Number of pixels and image quality X co-ordinate and Y co-ordinate Size and proportions

D All of these Answer C Co-ordinates are ranging according to the screen resolution. Mechanical Engineering Department

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CAD/CAM & AUTOMATION [Multiple Choice Questions] Name of Unit: COMPUTER GRAPHICS

UNIT No-01

Q.72

A True B False Answer A 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 Answer D

Q.73

The transformation of perspective projection must include, where d is the distance between the center of projection to the projection plane. A B C

Q.74

Q.75

Q.76

D -1/d Answer D An area on a display device to which a window is mapped is called a…………. A B C

Window Viewpoint Pixel

D Answer A Pixel is

None of the above B

A B C

a computer program that draws picture A picture stored in secondary memory The smallest resolvable part of a picture

D Answer

All of the above C

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

Q.77

KKWIEER

D 1/d -d

Computer Aided Engineering (CAE) Computer Aided Design (CAD)

Computer Aided Manufacturing (CAM) Computer Aided Instruction (CAI) D Answer B In which type of projection, actual dimensions and angles of objects and therefore shapes cannot be preserved? A Orthographic Mechanical Engineering Department

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CAD/CAM & AUTOMATION [Multiple Choice Questions] Name of Unit: COMPUTER GRAPHICS

UNIT No-01

Q.78

Q.79

Q.80

KKWIEER

B Isometric C Perspective D None of the above Answer C 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 B

(4.268, 6.732) (5.268, 6.732)

C D Answer

(4.268, 4.732) (6.268, 4.732) A

A triangle A with vertices P (50, 40), Q (100, 60) & R (70, 80) is to be scaled by using scale factors Sx =0.5 & Sy = 0.7 about point P, Find CT Matrix. A 0.5 0 0 [ 0 0.7 0] 0 0 1 B 0.5 0 25 [ 0 0.7 0 ] 0 0 1 0.5 0 25 C [ 0 0.7 12] 0 0 1 0.7 0 25 D [ 0 0.5 12] 0 0 1 Answer C 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) Answer C

Mechanical Engineering Department

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CAD/CAM & AUTOMATION [Multiple Choice Questions] UNIT No-02 Q.1.

Name of Unit: GEOMETRIC MODELING

For 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 Q.2.

In a 2-D CAD package, clockwise circular arc of radius, 5, specified from P1 (15,10) to P2 (10,15)will have its center at A

(10, 10)

B

(15, 10)

C

(15, 15)

D

(10, 15)

Answer A Q.3.

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

Wireframe modelling

B

Drafting

C

Surface modelling

D

solid modelling

Answer B Q.4.

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

Answer C Q.5.

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

CAD/CAM & AUTOMATION [Multiple Choice Questions] UNIT No-02 Q.6.

Q.7.

Q.8.

...