ECE 05 - Principles of Communication Systems Quiz
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Questions and Answers

Which type of noise is directly generated from the sun's heat?

  • Cosmic Noise
  • Internal Noise
  • Solar Noise (correct)
  • Man-made Noise

    • What is another name for Cosmic Noise?

  • Shot Noise
  • White Noise
  • Black-Body Noise (correct)
  • Thermal Noise

    • Which type of noise is caused by random arrival of carriers at the output element of an electronic device?

  • Shot Noise (correct)
  • Solar Noise
  • Internal Noise
  • Thermal Noise

    • What is the primary source of Man-made Noise?

    <p>Communtators in motors/generators</p> Signup and view all the answers

    What type of noise is associated with the movement of electrons within a conductor due to thermal agitation?

    <p>Thermal Noise</p> Signup and view all the answers

    Which type of internally generated noise is caused by transit time of carriers within a device or circuit?

    <p>Transit Time Noise</p> Signup and view all the answers

    What is electrical noise in a communication system?

    <p>Any undesirable electrical energy that falls within the passband of the signal</p> Signup and view all the answers

    What does correlation imply in the context of noise?

    <p>A relationship between the signal and the noise</p> Signup and view all the answers

    Which type of noise exists only when a signal is present?

    <p>Correlated noise</p> Signup and view all the answers

    What is an example of external noise?

    <p>Static electricity due to lightning</p> Signup and view all the answers

    At what frequencies is atmospheric noise relatively insignificant?

    <p>Above 30 MHz</p> Signup and view all the answers

    What does extraterrestrial noise consist of?

    <p>Electrical signals from outside Earth's atmosphere</p> Signup and view all the answers

    What is the bandwidth of an information signal?

    <p>The difference between the highest and lowest frequencies</p> Signup and view all the answers

    Why must the bandwidth of a communications channel be wide enough?

    <p>To avoid signal distortion</p> Signup and view all the answers

    What does Information Theory study focus on?

    <p>Efficient use of bandwidth in electronic communication systems</p> Signup and view all the answers

    What does Information Capacity measure in a communication system?

    <p>The maximum data rate</p> Signup and view all the answers

    What is a Binary Digit or bit used for?

    <p>To represent information digitally</p> Signup and view all the answers

    What does Bit Rate measure?

    <p>Number of bits transmitted per unit time</p> Signup and view all the answers

    What is the mathematical expression for rms noise voltage?

    <p>VN = 4𝑘𝑇𝐵𝑅</p> Signup and view all the answers

    In the context of noise voltage, what does the variable 'B' represent?

    <p>System Bandwidth</p> Signup and view all the answers

    For an electronic device operating at room temperature with a 10 kHz bandwidth, what is the thermal noise power measured in?

    <p>Watts and dBm</p> Signup and view all the answers

    What does the signal-to-noise ratio (SNR) measure?

    <p>Relative strength of desired signal power to noise power</p> Signup and view all the answers

    In the shot noise expression in = 2𝐵𝐼𝑞, what does 'I' represent?

    <p>DC Current</p> Signup and view all the answers

    What is the noise figure defined as?

    <p>Ratio of S/N at the input to S/N at the output</p> Signup and view all the answers

    What does a noise figure of 0 dB indicate in an ideal noiseless network?

    <p>No noise present</p> Signup and view all the answers

    In the context of noise figure, what does a value greater than 1 signify?

    <p>Amplification of noise</p> Signup and view all the answers

    What is the formula to calculate equivalent noise resistance (Req) in a network?

    <p>Req = Ra(F - 1)</p> Signup and view all the answers

    For a transistor amplifier with S/N power ratio of 10 at the input and 5 at the output, what does the calculated transistor noise figure represent?

    <p>Amplification factor of noise</p> Signup and view all the answers

    What does a high noise figure indicate in the context of amplifier performance?

    <p>Higher noise contribution</p> Signup and view all the answers

    How does an increase in bandwidth affect the shot noise for a diode with a forward bias?

    <p>Increases the shot noise</p> Signup and view all the answers

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