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6. In an iconoscope, in scanning the image, during the blanking period, the grid control is supplied with a
A. low negative potential
B. high negative potential
C. high positive potential
D. low positive potential
Explanation:
7. In TV transmission, the sound waves are transmitted by
A. phase modulation
B. frequency modulation
C. amplitude modulation
D. amplitude or phase modulation
Explanation:
8. Interlaced scanning is used, in order to
A. increase the brightness of image
B. decrease the brightness of image
C. avoid flickering of image
D. increase the contrast in the image
Explanation:
9. A blanking pulse is
A. a horizontal positive potential applied to the horizontal deflector plates
B. a high positive potential applied to the vertical deflector plates
C. a high negative potential applied to the control grid
D. a high negative potential applied to the filament
Explanation:
10. The mosaic in an iconoscope
A. consists of a large number of minute globules of caesium compound on one side of a thick mica sheet
B. is coated with a low work function material such as caesium oxide
C. is coated with zinc sulphide to produce fluorescence
D. is coated with barium platino cynide to produce fluorescence
Explanation:
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