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Correct Answer : Distortion
Explanation : The zero reference line of the modulating signal coincides with the peak value of the unmodulated carrier. Because of this, the relative amplitudes of the carrier and modulating signal are important. When the amplitude of the modulating signal is greater than the amplitude of the carrier, distortion will occur.
Correct Answer : Option (A) : Bandwidth is higher for binary data than audio signals
Explanation : Since binary data is transmitted in square waves or pulses, they are generally made up of numerous fundamental sine waves. This occupies a huge bandwidth as compared to audio signals which are analog in nature and usually comprise of a lesser number of sine waves.
Correct Answer : Option (D) : 25.75
Explaination : N/S = Frequency deviation by noise / maximum deviation = 156.42/4000 =0.0391S/N = (N/S)-1=25.57.
Correct Answer : Option (C) : 15.366°
Explanation : ?=sin-1(N/S)=sin-1(2/7)=sin-1(0.265)=15.366°.
