Types of Filters in Aviation
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Questions and Answers

What type of circuit is the 'Aviation Australia Simple series band-pass (A) View (B)'?

  • Parallel-LC circuit (correct)
  • Series-LC circuit
  • Parallel-resonant circuit
  • Series-resonant circuit

    • If the parallel LC circuit is tuned to the same frequency as the series LC circuit, what will it provide a path for?

  • No currents, as the parallel LC circuit will block all frequencies
  • All currents having frequencies outside the limits of the frequency band passed by the series-resonant circuit (correct)
  • All currents having frequencies inside the limits of the frequency band passed by the series-resonant circuit
  • Only the resonant frequency of the series LC circuit

    • What type of impedance does a series LC resonant circuit offer at resonance?

  • Maximum impedance
  • Infinite impedance
  • Constant impedance
  • Minimum impedance (correct)

    • What type of impedance does a parallel LC resonant circuit offer at resonance?

    <p>Maximum impedance</p> Signup and view all the answers

    What is the simplest type of band-pass filter formed by?

    <p>Connecting two LC circuits in series</p> Signup and view all the answers

    What are the upper and lower frequency limits of the filter action called?

    <p>Cut-off frequencies</p> Signup and view all the answers

    What is the main advantage of an LCR circuit?

    <p>It can separate frequencies.</p> Signup and view all the answers

    In a series resonant circuit, what is the impedance at resonance?

    <p>It is resistive and low.</p> Signup and view all the answers

    What is the purpose of a tuner in a TV or radio set?

    <p>To filter out unwanted frequencies.</p> Signup and view all the answers

    In a parallel resonant circuit (tank circuit), what is the impedance at resonance?

    <p>It is resistive and high.</p> Signup and view all the answers

    What do series resonant circuits offer at frequencies other than the resonant frequency?

    <p>Maximum opposition to current flow.</p> Signup and view all the answers

    What do parallel resonant circuits offer at frequencies other than the resonant frequency?

    <p>Minimum opposition to current flow.</p> Signup and view all the answers

    Which of the following is NOT one of the four basic types of filters?

    <p>Notch filter</p> Signup and view all the answers

    What is the term used to refer to the dividing line between low and high frequencies in a low-pass filter?

    <p>Cutoff frequency</p> Signup and view all the answers

    Which of the following statements about high-pass filters is true?

    <p>They pass all frequencies higher than a given cut-off frequency.</p> Signup and view all the answers

    Which component is responsible for reproducing low frequencies in a good set of speakers?

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

    What does the term 'band' refer to in the context of filters?

    <p>A range of frequencies</p> Signup and view all the answers

    What is the purpose of a filter card in an amplifier?

    <p>To split audio into high, medium, and low frequencies for different speakers</p> Signup and view all the answers

    What happens to signals in high-pass filters above the cut-off frequency?

    <p>They are passed with little attenuation</p> Signup and view all the answers

    What is the attenuation at the cut-off frequency for high-pass filters?

    <p>3 dB</p> Signup and view all the answers

    How does the attenuation change at lower frequencies below the cut-off frequency in high-pass filters?

    <p>Increases at a rate of 6 dB per octave</p> Signup and view all the answers

    What components are high-pass filters made of?

    <p>Inductors, capacitors, and resistors</p> Signup and view all the answers

    How is the output voltage from high-pass filters obtained?

    <p>Tapped from a voltage divider</p> Signup and view all the answers

    What is the role of the resistor in high-pass filters?

    <p>One component of a voltage divider</p> Signup and view all the answers

    What are the two basic configurations for a band-pass filter?

    <p>Series resonant LC network and parallel resonant LC network</p> Signup and view all the answers

    What is the purpose of a band-pass filter?

    <p>To pass a selected range of frequencies and attenuate all other frequencies</p> Signup and view all the answers

    How does a series LC circuit act as a band-pass filter?

    <p>It passes currents with frequencies at or near its resonant frequency and opposes the passage of all currents with frequencies outside this band</p> Signup and view all the answers

    What is the purpose of a band-stop filter?

    <p>To attenuate a selected range of frequencies and pass all other frequencies</p> Signup and view all the answers

    What is a common characteristic of both band-pass and band-stop filters?

    <p>They use resonant circuits</p> Signup and view all the answers

    How are band-pass and band-stop filters related?

    <p>They are constructed using the same two concepts</p> Signup and view all the answers

    What happens to the output voltage in an RC low-pass filter as the frequency increases?

    <p>More voltage appears across the resistor</p> Signup and view all the answers

    In an RL low-pass filter, what happens to the inductive reactance (XL) as frequency increases?

    <p>XL increases</p> Signup and view all the answers

    At low frequencies, what component in an RL low-pass filter has most of the input voltage appearing across it?

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

    What is the trend of capacitive reactance (XC) in an RC low-pass filter as frequency increases?

    <p>XC decreases</p> Signup and view all the answers

    In an RC low-pass filter, what happens to the portion of voltage appearing across the capacitor as frequency increases?

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

    What characteristic defines the output of an RL low-pass filter at high frequencies?

    <p>Rolls off higher frequencies</p> Signup and view all the answers

    What is the main function of a low-pass filter?

    <p>Passes low frequencies and rejects high frequencies</p> Signup and view all the answers

    In a high-pass filter, what is the behavior of frequencies below the cut-off frequency?

    <p>Essentially unaffected</p> Signup and view all the answers

    What type of frequencies does a band-pass filter allow to pass?

    <p>A range of frequencies</p> Signup and view all the answers

    What is the role of a tweeter in a set of speakers known for accurate sound reproduction?

    <p>Reproduces high frequencies</p> Signup and view all the answers

    How are signals treated in a band stop filter?

    <p>A specific band of signals is passed or rejected</p> Signup and view all the answers

    What is the defining characteristic of a mid-range speaker in a set of speakers?

    <p>Covers a range of mid-level frequencies</p> Signup and view all the answers

    What condition must be met for a series or parallel circuit to be in resonance?

    <p>The inductive reactance (XL) must equal the capacitive reactance (XC)</p> Signup and view all the answers

    What happens to the circuit impedance of a series resonant circuit at resonance?

    <p>The impedance is purely resistive</p> Signup and view all the answers

    How can the resonant frequency of a series or parallel circuit be changed?

    <p>By adjusting the inductance or capacitance values</p> Signup and view all the answers

    What is the purpose of a resonant circuit?

    <p>To amplify a specific frequency</p> Signup and view all the answers

    In a series resonant circuit, what happens to the inductive reactance (XL) as the frequency increases above the resonant frequency?

    <p>XL increases</p> Signup and view all the answers

    What is the relationship between the resonant frequency and the values of inductance (L) and capacitance (C) in a series or parallel circuit?

    <p>The resonant frequency is inversely proportional to L and directly proportional to C</p> Signup and view all the answers

    What is the purpose of a band-stop filter?

    <p>To block the passage of current for a narrow band of frequencies</p> Signup and view all the answers

    How does a band-stop filter differ from a band-pass filter?

    <p>A band-stop filter blocks a narrow band of frequencies</p> Signup and view all the answers

    Which configuration does a band-stop filter use?

    <p>Both series and parallel resonant LC networks</p> Signup and view all the answers

    What do parallel LC circuits do in a band-stop filter?

    <p>Block frequencies at or near the resonant frequency</p> Signup and view all the answers

    How does a series LC circuit behave in a band-stop filter?

    <p>Acts as a bypass for the band of rejected frequencies</p> Signup and view all the answers

    What characteristic curve appears in the Band-stop characteristic curve view?

    <p>Band-Stop Filter curve</p> Signup and view all the answers

    What is the main purpose of a band-pass filter?

    <p>Passing a wide range of frequencies</p> Signup and view all the answers

    Which type of circuit does a band-pass filter use?

    <p>Series resonant LC network or parallel resonant LC network</p> Signup and view all the answers

    What does a band-pass filter do to frequencies outside its selected range?

    <p>Greatly attenuates them</p> Signup and view all the answers

    In a band-pass filter, what does the series LC circuit oppose the passage of?

    <p>All frequencies except at resonance</p> Signup and view all the answers

    What characteristic do band-pass and band-stop filters share?

    <p>Rejecting or passing specific frequency ranges</p> Signup and view all the answers

    What effect does a band-pass filter have on frequencies outside the allowed range?

    <p>Greatly attenuates them</p> Signup and view all the answers

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