A blanking pulse is
1.a horizontal positive potential applied to the horizontal deflector plates
2.a high positive potential applied to the vertical deflector plates
3.a high negative potential applied to the control grid
4.a high negative potential applied to the filament
Posted Date:-2021-10-23 13:42:27
In a colour TV the primary colours used are
1.green yellow violet
2.violet red orange
3.green red blue
4.blue green violet
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In a TV receiver the blanking pulses are fed to
1.the horizontal deflector plates
2.the vertical deflector plates
3.the control grid of the electron gun the cathode
4.is coated with barium platino cynide to produce fluorescence
Posted Date:-2021-10-23 13:42:27
In a TV receiver the picture signals are applied to
1.the vertical deflector plates
2.the horizontal deflector plates
3.the control grid of the electron gun
4.the filament of the electron gun
Posted Date:-2021-10-23 13:42:27
In a TV the part of electron gun to which blanking pulses are fed is
1.the cathode
2.the grid
3.the anode
4.the filament
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In an iconoscope in scanning the image during the blanking period the grid control is supplied with a
1.low negative potential
2.high negative potential
3.high positive potential
4.low positive potential
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In television broadcasting video signals are produced using
1.an oscillator
2.a microphone
3.a loud speaker
4.an iconoscope
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In television the picture signal frequency is in the order of
1.hertz
2.kilohertz
3.megahertz
4.gigahertz
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In TV receiver the synchronizing pulses are fed to
1.The horizontal and vertical deflector plates of the picture tube
2.the control grid
3.the cathode
4.the electron gun
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In TV transmission the sound waves are transmitted by
1.phase modulation
2.frequency modulation
3.amplitude modulation
4.amplitude or phase modulation
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Interlaced scanning is used in order to
1.increase the brightness of image
2.decrease the brightness of image
3.avoid flickering of image
4.increase the contrast in the image
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Scanning is
1.the process in which light audio frequency variations are converted into voltage variations
2.the process in which light intensity is converted into variations in potentials
3.done by a beam of positive rays
4.the process in which audio frequency variations are converted into corresponding video frequency variations
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The frame synchronizing pulse is applied to
1.the vertical deflector plates
2.the horizontal deflector plates
3.control grid
4.filament
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The frequency of scanning in a television set in frames per second is
1.25
2.50
3.525
4.30
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The line synchronizing pulse is applied to
1.the vertical deflector plates
2.the horizontal deflector plates
3.control grid
4.filament
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The mosaic in an iconoscope
1.consists of a large number of minute globules of caesium compound on one side of a thick mica sheet
2.is coated with a low work function material such as caesium oxide
3.is coated with zinc sulphide to produce fluorescence
4.is coated with barium platino cynide to produce fluorescence
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The photosensitive plate of an Iconoscope is known as
1.mosaic
2.camera
3.grid
4.electron gun
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When the image is focused on the mosaic the globules become
1.luminous spot
2.negatively charged
3.positively charged
4.none
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When the individual images are transmitted and reproduced at the rate of 25 per sec. human eye records these image as a continuous process. This is due to
1.motion of the picture
2.ability of vision
3.persistence of vision
4.capacity of vision
Posted Date:-2021-10-23 13:42:27