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Correct Answer : Carrier peak line
Explanation : The modulating signal uses the peak value of the carrier rather than zero as its reference point. The envelope varies above and below the peak carrier amplitude. The zero reference line of the modulating signal coincides with the peak value of the unmodulated carrier.
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°.
