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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.

टीपा लिहा
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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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पाठ 15: Communication Systems - Exercise [पृष्ठ १०२]

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

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संबंधित प्रश्‍न

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?


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.


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.


In amplitude modulation ______.


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?


Draw the plot of amplitude versus ‘ω’ for an amplitude modulated wave whose carrier wave (ωc) is carrying two modulating signals, ω1 and ω22 > ω1). 

  1. Is the plot symmetrical about ωc? Comment especially about plot in region ω < ωc.
  2. Extrapolate and predict the problems one can expect if more waves are to be modulated.
  3. Suggest solutions to the above problem. In the process can one understand another advantage of modulation in terms of bandwidth?

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 ______.


The maximum amplitude for an amplitude modulated wave is found to be 12V while the minimum amplitude is found to be 3V. The modulation index is 0.6x where x is ______.


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