Interview Questions.

Question 1. What Is Scan Conversion?

Answer :

A primary undertaking of the display processor is digitizing a image definition given in an utility program into a fixed of pixel-depth values for garage inside the body buffer. This digitization system is referred to as scan conversion.

Question 2. Write The Properties Of Video Display Devices?

Answer :

Properties of video display devices are staying power ,resolution, and aspect ratio.

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Question three. What Is Rasterization?

Answer :

The technique of determining the ideal pixels for representing picture or images object is referred to as rasterization.

Question 4. Define Computer Graphics.

Answer :

Computer snap shots stays one of the maximum present and swiftly growing laptop fields. Computer portraits perhaps defined as a pictorial illustration or graphical representation of items in a laptop.

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Question five. Name Any Four Input Devices?

Answer :

Four enter gadgets are keyboard, mouse, photo scanners, and trackball.

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Question 6. Write The Two Techniques For Producing Color Displays With A Crt?

Answer :

Beam penetration method, shadow mask technique.

Question 7. What Is Vertical Retrace Of The Electron Beam?

Answer :

In raster test show, on the quit of one frame, the electron beam returns to the left pinnacle corner of the display screen to start the next body.

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Question 8. Short Notes On Video Controller?

Answer :

Video controller is used to control the operation of the show tool. A fixed location of the system is reserved for the body buffer, and the video controller is given direct get right of entry to to the body buffer reminiscence.

Question 9. What Is Bitmap?

Answer :

Some machine has best one bit according to pixel; the frame buffer is frequently known as bitmap.

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Question 10. Differentiate Plasma Panel Display And Thin Film Electroluminescent Display?

Answer :

In plasma panel display, the location between  glass plates is packed with neon gasoline. In thin movie electroluminescent show, the location among  glasses plates are full of phosphor, which include zinc sulphide doped with manganese.

Question eleven. What Is Resolution?

Answer :

The most variety of points that may be displayed without overlap on a CRT is referred to as the decision.

Question 12. What Is Horizontal Retrace Of The Electron Beam?

Answer :

In raster experiment display, the electron beam go back to the left of the screen after fresh each test line, is referred to as horizontal retrace of the electron beam.

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Question thirteen. What Is Filament?

Answer :

In the CRT, warmness is implemented to the cathode by means of directing a contemporary thru a coil of twine, is known as filament

Question 14. What Is Pix Map?

Answer :

Some gadget has more than one bits according to pixel, the body buffer is regularly known as snap shots map.

Question 15. Write The Types Of Clipping?

Answer :

Point clipping, line clipping, area clipping, text clipping and curve clipping.

Question 16. What Is Meant By Scan Code?

Answer :

When a key is pressed at the keyboard, the keyboard controller locations a code convey to the important thing pressed into a part of the reminiscence known as as the keyboard buffer. This code is called because the test code.

Question 17. List Out The Merits And Demerits Of Penetration Techniques?

Answer :

The deserves and demerits of the Penetration strategies areas follows. It is an inexpensive technique. It has most effective 4 colors. The nice of the photo is not accurate while it's miles as compared to different techniques. It can display colour scans in video display units. Poor trouble and so on.

Question 18. List Out The Merits And Demerits Of Dvst?

Answer :

The deserves and demerits of direct view storage tubes[DVST] are as follows. It has a flat display. Refreshing of display screen isn't required. Selective or element erasing of screen isn't always feasible. It has negative contrast Performance is inferior to the refresh CRT.

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Question 19. What Do You Mean By Emissive And Non-emissive Displays?

Answer :

The emissive display converts electrical strength into light strength. The plasma panels, thin film electro-luminescent presentations are the examples. The Non-emissive are optical outcomes to convert the daylight or mild from another source to photograph form. Liquid crystal show is an instance.

Question 20. List Out The Merits And Demerits Of Plasma Panel Display?

Answer :

Merits. Refreshing isn't always required. Produce a very steady photo freed from Flicker. Less cumbersome than a CRT. Demerits. Poor decision of as much as 60 d.P.I. It calls for complex addressing and wiring. It is dearer than CRT.

Question 21. What Is Persistence?

Answer :

The time it takes the emitted mild from the display to decay one tenth of its unique depth is called as patience.

Question 22. What Is Aspect Ratio?

Answer :

The ratio of vertical factors to the horizontal points important to supply length of traces in both directions of the screen is called the Aspect ratio. Usually the aspect ratio is ¾.

Question 23. What Is The Difference Between Impact And Non-effect Printers?

Answer :

Impact printer press formed person faces towards an inked ribbon directly to the paper. A line printer and dot-matrix printer are examples. On-effect printer and plotters use Laser techniques, inkjet sprays, Xerographic technique, electrostatic methods and electro thermal methods to get pix onto the papers. Examples are: Inkjet/Laser printers.

Question 24. Define Pixel?

Answer :

Pixel is shortened styles of picture element. Each display screen point is referred to as pixel or pel.

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Question 25. What Is Frame Buffer?

Answer :

Picture definition is stored in a reminiscence place referred to as frame buffer or refresh buffer.

Question 26. Where The Video Controller Is Used?

Answer :

A unique purpose processor, that is used to control the operation of the display device, is known as video controller or show controller.

Question 27. What Is Run Length Encoding?

Answer :

Run period encoding is a compression technique used to keep the depth values within the frame buffer, which shops every experiment line as a hard and fast of integer pairs. One range each pair shows an intensity fee, and second quantity specifies the wide variety of adjoining pixels on the experiment line which might be to have that intensity cost.

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Question 28. What Is Point In The Computer Graphics System?

Answer :

The factor is a maximum simple graphical element & is absolutely described by a pair of consumer coordinates (x, y).

Question 29. Write Short Notes On Lines?

Answer :

A line is of limitless quantity may be defined by means of an attitude of slope q and one factor on the line P=P(x,y). This also can be defined as y=mx+C in which C is the Y intercept.

Question 30. Define Circle?

Answer :

Circle is described with the aid of its middle xc, yc and its radius in person coordinate devices. The equation of the circle is (x-xc) + (yyc)= r2.

Question 31. What Are The Various Attributes Of A Line?

Answer :

The line type, width and colour are the attributes of the line. The line kind consist of stable line, dashed strains, and dotted lines.

Question 32. What Is Ant Aliasing?

Answer :

The procedure of fixing intensities of the pixels along the road to limit the impact of aliasing is called ant aliasing.

Question 33. What Is Transformation?

Answer :

Transformation is the method of introducing changes inside the form length and orientation of the item the usage of scaling rotation mirrored image shearing & translation etc.

Question 34. What Is Translation?

Answer :

Translation is the method of changing the placement of an object in a directly-line path from one coordinate location to another. Every factor (x , y) in the object have to underneath move a displacement to (xdone through repositioning the coordinates alongside a circular route, inside the x-y aircraft with the aid of making an angle with the axes. The transformation is given via = r cos (q + f) and Ycompleted by way of repositioning the coordinates alongside a round direction, within the x-y aircraft by means of making an angle with the axes. The transformation is given through:Xtruely slants the object along the X route or the Y direction as required. Ie; this change slants the form of an object along a required plane.

Question 38. What Is Reflection?

Answer :

The reflection is truely the transformation that produces a reflect picture of an item. For this use a few angles and features of mirrored image.

Question 39. What Are The Two Classifications Of Shear Transformation?

Answer :

X shear, y shear.
A point (4,three) is rotated counterclockwise by an perspective of45°. Find the rotation matrix and the ensuing factor

Question forty. What Is Computer Graphics?

Answer :

The term laptop images encompass almost every element on laptop that is not text or sound. It is an art of drawing pix, strains. Charts, etc. The use of computer systems with the assist of programming. Or we will say that pics is the illustration and manipulation of image information by laptop with the assist from specialised software and hardware. Graphic designing is finished using the various available softwares for computers that can produce the 3-d pictures within the required form and size. Computer pictures help us in getting the real display stories.

Question 41. Write The Important Applications Of Computer Graphic?

Answer :

Following are the applications of pc photograph
1. Computer snap shots is used inside the area of computer aided design.
2. It is used to produce illustrations for reviews or to generate slide for with projections.
Three. Computer photograph techniques are extensively utilized in each first-class are and business are packages.
4. The artist uses a mixture of 3-d modeling packages, texture mapping, drawing packages and CAD software.
Five. In the sphere of amusement CG techniques are actually usually used in making movement pix. Tune films and television shows.
6. Computer-generated fashions of physical, financial and financial systems are often used as educational aids.

Question 42. What Are The Raster And Vector Graphics?

Answer :

The Raster and Vector snap shots may be defined as-
RASTER- In laptop pics photo, or BITMAP, is a dot matrix statistics shape representing a generally rectangular grid of pixels or factors of color, viewable via a reveal, paper, or different display medium. Raster picture are saved in image documents with various formats.
VECTOR- Vector graphics is the usage of geometrical primitives inclusive of points, lines, curves, and shapes or polygon, which can be all primarily based on mathematical expressions, to represent photo in pc graphics. “Vector”, in this context, implies greater than a instantly line.

Question 43. Write The Difference Between Vector And Raster Graphics?

Answer :

Following are the differences between vector and raster images-
1. Raster or Bitmap photos are resolution established because of this its not viable to boom or lower their length with out sacrificing on photograph quality.
While vector based totally photo are not dependent on decision. The length of vector photo picture may be expanded or decreased without affecting image high-quality.
2. Raster or bitmap pix are usually square in shape, Vector photograph, but, could have any shape.
3. Unlike raster photo, vector photo can’t be use for realistic photographs. This is because vector pictures are made up of stable color areas and mathematical gradients, that will’t be used to reveal non-stop tones of a colorations in a herbal photo.

Question 44. What Is Scaling In Computer Graphics?

Answer :

In pc graphic, photograph scaling is the manner of resizing a virtual image. Scaling is a non-trivial procedure that includes a change off between efficiency, smoothness and sharpness. With bitmap snap shots, as the scale of an photo is reduced or enlarged, the pixels which include the image end up an increasing number of seen, making the photograph appear “tender” if pixels are averaged, or jagged if now not.

Question 45. What Are The Hardware Devices Used For Computer Graphics?

Answer :

The hardwares devices used for the pc photos are

Input Devices: Keyboard, Mouse, Data pill, Scanner, Light pen, Touch display, Joystick
Output Devices: Raster Devices- CRT, LCD, LED, Plasma monitors, Printers,Vector Devices- Plotters, Oscilloscopes

Question forty six. What Are The Features Of Inkjet Printers?

Answer :

Features of inkjet printers are
1. They can print 2 to 4 pages per minute.
2. Decision is set 360d.P.I. Therefor better print nice is completed.
3. The running fee may be very low. The only component that requires alternative is ink cartridge.
Four. Four colors cyan, yellow, magenta, black are to be had.

Question 47. What Are The Advantages Of Electrostatic Plotters?

Answer :

Following are the blessings of electrostatic plotters-
1. They are faster then pen plotters and really excessive nice printers.
2. Recent electrostatic plotters includes a scan conversion capability.
3. Coloration electrostatic plotters are to be had. They make a couple of passes over the paper to plot shade image.

Question 48. Define Random And Raster Scan Displays?

Answer :

Random test is a method wherein display is made by way of digital beam, that is directed only to the factors or components of the display screen wherein photo is to be drawn.

The Raster scan gadget is a scanning method wherein the electron sweep from pinnacle to backside and from left to proper. The intensity is became on or off to mild and un-mild the pixel.