Analog Communication System Objective Questions and Answers

155. In a 100% amplitude modulated signal, the power in the upper sideband when the carrier power is 100 watts and the modulation system is SSBSC is

156. The percentage saving in power of 100% modulated SSBSC amplitude modulated signal as compared to DSB signal is

A. 100

157. In a single side band suppressed carrier AM system, the modulation index is changed from 0 to 1. If thecarrier power is 200 watts, the power content of the signal is

A. unchanged

B. doubled

C. halved

D. increased by 50 watts

Discussion

158. Modulation system used for video modulation in television broadcast is

A. DSB AM with carrier

B. SSB AM with carrier

C. SSBSC

D. a modified form of SSB with carrier called vestigial sideband (VSB)

Discussion

159. The biggest advantage of VSB system is

A. that it conserves bandwidth and overcomes the problem of low video frequency attenuation

B. lesser power requirement

C. its bandwidth conservation

D. simplicity of transmitter circuitry

Discussion

160. According to CCIR standards, in vestigial sideband transmission, video frequencies upto

A. 4 MHz are transmitted

B. 5 MHz are transmitted

C. 4.5 MHz are transmitted

D. none of these

Discussion

161. In a VSB system, the power contained in the sidebands due to a modulating frequency of 4 MHz is 50 watts, the power in the sidebands due to a modulating frequency of 0.5 MHz

A. is 50 watts

B. is 100 watts

C. is 25 watts

D. can not be determined from given data

Discussion

Electronics Engineering Objective Questions { Analog Communication System }