Communication
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Questions and Answers

What is the primary reason for maintaining a constant amplitude of the carrier in FM?

  • To reduce the total transmitted power
  • To prevent interference from other signals
  • To maintain the overall amplitude of the FM wave constant (correct)
  • To ensure the side bands are separated from each other by the frequency of the modulating signal

    • What is the deviation ratio in FM?

  • The ratio of the modulating signal frequency to the carrier frequency
  • The ratio of actual frequency deviation to the maximum allowed frequency deviation
  • The ratio of side bands to the carrier frequency
  • The ratio of maximum permitted frequency deviation to the maximum permitted audio frequency (correct)

    • What is the expression for the bandwidth of an FM signal?

  • fm × (fc + 2fm)
  • 2n × fm (correct)
  • 2 × fm
  • fc × (fm + 2fm)

    • What is the percentage of modulation in an FM signal?

    <p>The ratio of actual frequency deviation to the maximum allowed frequency deviation</p> Signup and view all the answers

    What is the total power of an FM signal?

    <p>1.5 × Pc</p> Signup and view all the answers

    What is the primary reason for modulation of a low frequency signal?

    <p>To enable transmission over long distances without attenuation</p> Signup and view all the answers

    Why is the height of the antenna crucial in signal transmission?

    <p>To enable efficient radiation and reception</p> Signup and view all the answers

    What is the modulation index 'm' given by?

    <p>m = m1 + m2 + m3 + ...</p> Signup and view all the answers

    What is the range of audible signals?

    <p>20 Hz to 20 KHz</p> Signup and view all the answers

    What is the wavelength of a 1 MHz frequency?

    <p>75 m</p> Signup and view all the answers

    What is the bandwidth of an Amplitude Modulation (AM) signal?

    <p>(fc + fm) - (fc - fm)</p> Signup and view all the answers

    What is the modulation index in Frequency Modulation (FM)?

    <p>The ratio of the maximum frequency deviation to the modulating frequency</p> Signup and view all the answers

    What is the advantage of Frequency Modulation (FM) over Amplitude Modulation (AM)?

    <p>FM is less prone to amplitude-sensitive noise than AM</p> Signup and view all the answers

    What is the power dissipated in a circuit in terms of voltage amplitude and resistance?

    <p>P = E^2 / R</p> Signup and view all the answers

    What is the relationship between the modulation index and the number of sidebands in an AM signal?

    <p>The modulation index determines the number of sidebands</p> Signup and view all the answers

    What is the process of changing the amplitude of a carrier wave in accordance with the amplitude of the audio frequency signal known as?

    <p>Amplitude Modulation (AM)</p> Signup and view all the answers

    What remains unchanged in Amplitude Modulation (AM)?

    <p>Frequency of the carrier wave</p> Signup and view all the answers

    What is the expression for the modulated wave in Amplitude Modulation (AM)?

    <p>Ec cos(ωc t) + aEc cos(ωc - ωm)t - aEc cos(ωc + ωm)t</p> Signup and view all the answers

    What are the frequencies present in an Amplitude Modulation (AM) wave?

    <p>fc, fc + fm, fc - fm</p> Signup and view all the answers

    What is the term for the frequencies fc + fm and fc - fm in an Amplitude Modulation (AM) wave?

    <p>Side band frequencies</p> Signup and view all the answers

    What is the primary reason for the limitation of amplitude modulation?

    <p>All of the above</p> Signup and view all the answers

    What determines the maximum variation in frequency of the modulated wave for a given modulating signal?

    <p>Constant of proportionality</p> Signup and view all the answers

    What is the process of changing the frequency of a carrier wave in accordance with the audio frequency signal known as?

    <p>Frequency Modulation</p> Signup and view all the answers

    What is the ratio of the maximum frequency deviation to the modulating frequency?

    <p>Modulation index</p> Signup and view all the answers

    What is the total variation in frequency from the lowest to the highest called?

    <p>Carrier swing</p> Signup and view all the answers

    What is the frequency deviation in Frequency Modulation?

    <p>The maximum change in frequency from the mean value</p> Signup and view all the answers

    What is the significance of modulation index in Frequency Modulation?

    <p>It determines the number of side bands</p> Signup and view all the answers

    What is the process of digitising the quantised pulses according to some code?

    <p>Coding</p> Signup and view all the answers

    What is the type of modulation where the amplitude of the pulse varies in accordance with the modulating signal?

    <p>Pulse Amplitude Modulation (PAM)</p> Signup and view all the answers

    What is the total power of side bands in an FM signal?

    <p>Ec2 / 2R</p> Signup and view all the answers

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