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A modulating signal is a square wave, as shown below,
Question Image
The carrier wave is given by c (t)= 2 sin (8πt) volts. What is the modulation index?

Important Questions on Communication Systems

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12th Andhra Pradesh Board
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Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 16 - Communication Systems>Exercise>Q 15
For an amplitude modulated wave, the maximum amplitude is found to be 10 V  while the minimum amplitude is found to be 2 V. Determine the modulation index, μ. What would be the value of μ  if the minimum amplitude is zero volt?
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12th Andhra Pradesh Board
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Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 16 - Communication Systems>Exercise>Q 16
Due to economic reasons, only upper side-band of an AM wave is transmitted, but at the receiving station, there is a facility for generating the carrier. Show that if a device is available which can multiply two signals, then it is possible to recover the modulating signal at the receiver station.
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12th Andhra Pradesh Board
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Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 16 - Communication Systems>Exercise>Q 17
Define modulation. Why is it necessary?
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12th Andhra Pradesh Board
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Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 16 - Communication Systems>Exercise>Q 18
A modulating signal is a square wave, as shown below:
Question Image
The carrier wave is given by c(t) =2 sin 8πt volts.Sketch the amplitude modulated waveform.
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12th Andhra Pradesh Board
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Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 16 - Communication Systems>Exercise>Q 19
How can an amplitude modulated wave be detected?
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12th Andhra Pradesh Board
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Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 16 - Communication Systems>Exercise>Q 20
How can an amplitude modulated wave be generated?
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12th Andhra Pradesh Board
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Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 16 - Communication Systems>Exercise>Q 21
On radiating (sending out) an AM modulated signal, the total radiated power is due to the energy carried by ωc, ωc – ωm & ωc + ωm. Suggest ways to minimize the cost of radiation without compromising on the information.
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12th Andhra Pradesh Board
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Physics Crash Course (Based on Revised Syllabus-2023)>Chapter 16 - Communication Systems>Exercise>Q 22
If the whole earth is to be connected by LOS communication using space waves (no restriction of antenna size or tower height), what is the minimum number of antennas required? Calculate the tower height of these antennas in terms of the earth's radius?