GROUP - A
1:- Each question carries 1 marks.
1). The ratio of minimum to maximum value of brightness is known as
(a) contrast ratio(b) contrast
(c) fluorescent ratio
(d) none of these
2). 0.3R+0.59G+0.11B represent :
(a)α Signal
(b)β Signal
(c)γ signal
(d) Z signal
3). Flyback may also be called......
(a) Vertical retrace
(b) Horizontal retrace
(c) Lateral retrace
(d) Non of these
4). Which camera tube has highest dark current ?
(a) Saticon
(b)Plumbicon
(c)Vidicon
(d)Terricon
5). What is value of audio intermediate frequency (IF)in television system ?
(a) 33.4 MHz
(b)38.9MHz
(c)5.5MHz
(d)72.3MHz
6). How are the horizontal and vertical pulses separated in TV set ?
(a) By AFC
(b)Sync circuit
(c)Sync separator
(d)By AGC
7). In TV, the voltage applied in the deflection coil is :
(a) Saw tooth wave
(b)Square wave
(c)Line wave
(d)Triangular wave
8). The value of bandwidth allocated to each channel in Indian television system is:
(a) 7MHz
(b)10MHz
(c)20MHz
(d)25MHz
9). High frequency current is changed into electromagnetic wave and vice versa by :
(a) Tunner
(b)Booster
(c)Antenna
(d)Rf amplifier
10). The tunner circuit is made from :
(a) Local oscillator and RF amplifier (b)Mixer RF amplifier and local oscillator
(c)RF amplifier and mixer
(d)None of these
11). The number of possible colour with a fallen digital input monitors is :
(a) 16
(b)4
(c)8
(d)3
12). In TV signal,percent modulation for back level is...........that of sync signal.
(a) Equal to
(b)Less than
(c)Greater than
(d)None of these
13). The coverage of range of television in VHF is limited by :
(a) Earth's curvature
(b)Spherical layer
(c)Time of the day
(d)Climate of the day
14). Iconoscope is based on the principle of :
(a) Photoconduction
(b)Photoemission
(c)Secondary emission
(d)None of these
15). The number of lines per second in Indian TV system is
(a) 15625
(b)31250
(c)15750
(d)31500
16). Equalising pulses in TV are sent during
(a) The saturation
(b)Vertical blanking
(c)Horizontal retrace
(d)None of these
17). The colour to which eye is most sensitive
(a) Blue
(b)Green
(c)Red
(d)Yellow
18). Vidicon tubes operates on the principle of :
(a) Photoconduction
(b)Photoemission
(c)Thermonic emission
(d)None of these
19). The aspect ratio of HDTV is :
(a) 4/3
(b)5/3
(c)3/2
(d)None of these
20). Degaussing coil is used in colour TV tube to :
(a) Increase brightness
(b)Reduce x-ray emission
(c)Reduce the effect of earth's magnetic field
(d)None of these
GROUP-B : All question carries 4 marks.
(2) Define and explain blanking and synchronising pulses.
OR
Explain gamma correction.
(3) what is the function of IF and AGC in television communication system.
OR
Enumerate the application of CCTV.
(4) what are the basic problem of video recording and how are they resolved?
OR
Find the number of possible colors with a 4 digital input.
(5) Draw the block diagram of VHF tuner and explain.
OR
Draw the block diagram of RF tuner.
(6) Define the process of photo conduction and photo emission.
OR
What are U and V signals ? explain briefly.
GROUP:-C
Each question carries 6 marks:-
(7) Explain the following terms:-
(A) Hue
(b) Luminance
(c) Gamma correction
OR
Draw the block diagram of cable television and briefly explain.
(8) Explain the working vidicon camera tube with neat diagram.
OR
Write brief technical notes on LCD TV and LED TV.
(9) Explain the construction and working of tuner with suitable block diagram.
OR
Find the vertical and horizontal resolution of TV system in India if 20 line are are lost per field assume K = 0.7
(10) explain the term aspect ratio and raster with reguards to television. Determine the vertical and horizontal frequency
(a)with 525 line and 30 frame pers econd.
(b)with 625 lines and frame per second.
OR
What do you mean by TV antenna ?which antenna used for receiving TV signals ?
(11) compare the characteristic features of vidicon and orthicon camera tube.
OR
Define brightness, saturation and Hue.
How is colour completely specified.
Answer:- 1-a ,2-c,3-b ,4-b, 5-a, 6-c, 7-d, 8-a, 9-c ,10-b, 11-a, 12-b, 13-a, 14-b, 15-a, 16-b, 17-b, 18-a, 19-a,20-c
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