EC1011 Television & Video Engineering B.E Question Bank : niceindia.com
Name of the College : Noorul Islam College of Engineering
University : Anna University
Degree : B.E
Department : Electronics and Communication Engineering
Subject Code/Name : EC 1011 – Television & Video Engineering
Year : IV
Semester : VII
Document Type : Question Bank
Website : niceindia.com
Download :https://www.pdfquestion.in/uploads/ni…NGINEERING.pdf
NICE Television & Video Engineering Question Paper
2 Mark Questions and Answers :
1. Mention the major function of the camera tube? :
The major function of the camera tube is to convert an optical image into electrical signals.
2. Define visual acuity? :
Visual acuity can be defined as the ability of human eye to resolve finer details in a picture
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3. What do you refer by persistence of eye? :
The persistence of eye refers to the storage capability of the human eye
4.Define luminous intensity? :
It is the measure of light intensity responsible for stimulating visual sensation.
5.Define aspect ratio? :
Aspect ratio can be defined as the ratio of width to height of the picture frame. For television, it is standardized as 4 :3.
6.Define luminous flux? :
Luminous flux can be defined as the radiated luminous power or power of visible light expressed interms of its effect on the average or normal human eye.
7.Define luminance? :
Luminance can be defined as the quantity of light intensity emitted per square centimeter of an illuminated area.
8.What do you understand by illuminance? :
Illuminance is the average luminous flux incident on to a surface.
9.what do you mean by resolving power or resolution? :
It is the ability of the image reproducing system to represent the fine structure of an object.
10.Mention some important characteristics of human eye? :
Visual acuity, persistence of vision, brightness and colour sensation are some of the important characteristics of human eye.
11.What are rods and cones? :
The retina of the human eye consists of light sensitive cellular structures of two kinds namely rods and cones. The rods sense primarily the brightness levels including very faint impressions. The cones are mainly responsible for colour perception. There are 65 lakhs cones and about 10 crores rods connected to the brain through 8 lakhs optic nerve fibres.
12.Give the relationship between eye parameters? :
The eye parameters are related by the following equation :
B=constant / c2a0
Where,
c- the constant ratio
b-the scene brightness
a0 – the minimum resolvable angle
13.Why is scanning necessary in television system? :
Scanning is the important process carried out in a television system inorder to obtain continuous frames and provides motion of picture. The scene is scanned both in the horizontal and vertical directions simultaneously in a rabid rate. As a result sufficient number of complete picture of frames per second is obtained to give the illusion of continuous motion.
14.What do you understand by flicker? :
The result of 24 pictures per second in motion pictures and that of scanning 25 frames per second in television pictures is enough to make an illusion of continuity. But, they are not rapid enough to permit the brightness of one picture or frame to blend smoothly in the next through the time when the screen is blanked between successive frames. This develops in a definite flicker of light that is very irritating to the observer when the screen is made alternately bright and dark.
15.How will you solve the flickering problem? :
The flickering problem is solved in motion pictures by showing each picture twice. Hence 48 views of the scene are shown per second although they are still the same 24 pictures frames per second. As a result of the increased blanking rate, flicker is removed. In TV, Interlaced scaning is used to avoid flicker
16.What do you mean by interlaced scanning? :
When the scanning beam reaches the bottom of the picture frame, it quickly returns to the top to scan those lines that were missed in the previous scanning. Hence the total number of lines are divided into two groups called fields. Each field is scanned alternately. This way of scanning is called interlaced scanning.
17.Define vertical resolution? :
The capability of resolving picture details in the vertical direction is called vertical resolution.
18.What is horizontal resolution? :
The ability of the system to resolve maximum number of picture elements along the scanning lines determines horizontal resolution.
19.List the contents of a composite video signal? :
Composite video signal consists of a camera signal, blanking pulses and synchronizing pulses.
20.What do you mean by pedestal? :
The difference between the black level and blanking level is known as the pedestal.