197. In TV studios, cyclorama is used to
A. provide noise necessary to give reality to dramatic scenes
B. provide background to exterior scenes
C. suppress sound of footsteps
D. produce wind effect for pseudo-exteriors shot in the studio
198. The 20-kW TV transmitter of Sri Lanka's colour transmission Rupavahini is located 2.5 km above sea level. The range of this transmitter is_____ km.
A.200
B.250
C.100
D.500
199. If people living in Trivandrum want to receive clear Rupavahini colour transmission from Sri Lanka, they should
A. buy KELTRON TV receiver set
B. use tall booster antenna
C. use balun units
D. employ antenna rotator
200. One sign of week TV aerial signal is
A. presence of ghost images
B. fading of the picture
C. snow in the picture
D. feeble brightness of the screen
201. The line frequency of TV system in India is
A. 50 Hz
B. 625 Hz
C. 15,625 Hz
D. 15,750 Hz
202. In TV if there is no brightness but sound is normal, the trouble could be in
A. R.F. amplifier
B. horizontal oscillator
C. vertical oscillator
D. none of the above
203. Equalizing pulses in TV are sent during
A. horizontal blanking
B. vertical blanking
C. the serrations
D. the horizontal retrace
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