Analog Communication System Objective Questions and Answers

218. Which of the following statements is correct? In the spectrum of frequency-modulated wave

219. The output of transmitter is 100 kW with carrier unmodulated and 132 kW when the carrier is modulated by a sinusoidal wave, then depth of modulation is

A. 16

220. The modulating index, for a PM signal, depends upon which of the following?

A. Only the amplitude of the modulating signal

B. Only the frequency of the modulating signal

C. Both the amplitude and frequency of the modulating signal

D. The frequency of the carrier signal amongst other things

Discussion

221. Which of the following are suppressed by the transmitter in S.S.B.?

A. audio and one of the sideband frequencies

B. Carrier and one of the sideband frequencies

C. Carrier and audio frequency

D. None of the above

Discussion

222. Regarding the Armstrong modulation system, which of the following statements is incoreect?

A. Frequency multiplication must be used

B. Equalisation is unnecessary

C. The system is basically phase, not frequency modulation

D. AFC is not needed

Discussion

223. In a ratio detector

A. the circuit is the same as in a discriminator except that the diode are reversed

B. the linearity is worse than in a phase discriminator

C. the output is twice that obtainable from a similar phase discriminator

D. stabilization against signal strength variations is provided

Discussion

224. A heterodyne frequencychanger is called a

A. frequency translator

Electronics Engineering Objective Questions { Analog Communication System }