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कर्नाटक बोर्ड पी.यू.सी.पीयूसी विज्ञान 2nd PUC Class 12

Compute the LC product of a tuned amplifier circuit required to generate a carrier wave of 1 MHz for amplitude modulation.

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प्रश्न

Compute the LC product of a tuned amplifier circuit required to generate a carrier wave of 1 MHz for amplitude modulation.

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उत्तर

Frequency of tuned amplifier is `v = 1/(2pisqrt(LC))`

As per question, `v = 1 MHz = 10^6 Hz`

or `10^6 = 1/(2pisqrt(LC))`

or LC = `1/(4pi^2 (10^6)^2` = 2.5 × 10–14s

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अध्याय 15: Communication Systems - Exercise [पृष्ठ १०२]

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एनसीईआरटी एक्झांप्लर Physics Exemplar [English] Class 12
अध्याय 15 Communication Systems
Exercise | Q 15.19 | पृष्ठ १०२

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संबंधित प्रश्न

Explain any two factors that justify the need of modulating a low-frequency signal.


Explain the process of amplitude modulation.


A modulating signal is a square wave, as shown

The carrier wave is given by  `c(t) = 2 sin (8pit) "volts"`

(i) Sketch the amplitude modulated waveform

(ii) What is the modulation index?


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?


Define the term 'amplitude modulation'


Explain any two factors which justify the need for modulating a low frequency base-band signal.


Write two advantages of frequency modulation over amplitude modulation.


Write three important factors which justify the need of modulating a message signal. Show diagrammatically how an amplitude modulated wave is obtained when a modulating signal is superimposed on a carrier wave.


Why is frequency modulation preferred over amplitude modulation for transmission of music?


Answer the following question.
If A and B represent the maximum and minimum amplitudes of an amplitude-modulated wave, write the expression for the modulation index in terms of A and B.


Define amplitude modulation in a communication system.


Identify the mathematical expression for amplitude modulated wave ______.


In amplitude modulation, the modulation index m, is kept less than or equal to 1 because ______.

  1. m > 1, will result in interference between carrier frequency and message frequency, resulting into distortion.
  2. m > 1 will result in overlapping of both side bands resulting into loss of information.
  3. m > 1 will result in change in phase between carrier signal and message signal.
  4. m > 1 indicates amplitude of message signal greater than amplitude of carrier signal resulting into distortion.

The maximum amplitude of an A.M. wave is found to be 15 V while its minimum amplitude is found to be 3 V. What is the modulation index?


Why is a AM signal likely to be more noisy than a FM signal upon transmission through a channel?


An audio signal vm = 20sin2π(1500t) amplitude modulates a carrier vc = 80 sin 2π (100,000t). The value of percent modulation is ______.


An amplitude-modulated wave is represented by Cm(t) = 10(1 + 0.2 cos 12560t) × sin (111 × 104t) volts. The modulating frequency in kHz will be ______.


The maximum and minimum voltage of an amplitude modulated signal are 60 V and 20 V respectively. The percentage modulation index will be ______.


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