Physics Fundamentals of Electronics: BJT Transistor
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Physics Fundamentals of Electronics: BJT Transistor

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Questions and Answers

What is the condition for a transistor to be in active mode?

  • VCE is equal to VCEsat
  • VCE is zero
  • VCE is greater than VCEsat (correct)
  • VCE is less than VCEsat

    • What is the significance of VCEsat in a transistor?

  • It is the voltage at which the transistor is in active mode
  • It is the minimum voltage required for saturation (correct)
  • It is the maximum voltage required for saturation
  • It is the voltage at which the transistor is in cutoff mode

    • What happens when VCE is less than VCEsat in a transistor?

  • The transistor is in breakdown mode
  • The transistor is in active mode
  • The transistor is in saturation mode (correct)
  • The transistor is in cutoff mode

    • What is the role of the transistor in a circuit when VCE is greater than VCEsat?

    <p>It acts as an amplifier</p> Signup and view all the answers

    What is the relationship between VCE and VCEsat in a transistor?

    <p>VCE can be either greater or less than VCEsat</p> Signup and view all the answers

    What happens when VCE is equal to VCEsat in a transistor?

    <p>The transistor is in saturation mode</p> Signup and view all the answers

    What is the region of operation when IB = 0?

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

    What is the collector current equation in the saturation region?

    <p>IC = βIB</p> Signup and view all the answers

    What happens to VCE when the base-emitter junction becomes forward-biased?

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

    What is the voltage at the collector when the transistor is in the cutoff region?

    <p>VCE = VCC</p> Signup and view all the answers

    What represents the collector-to-emitter voltage with the base open?

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

    What is the point where the base-collector junction becomes forward-biased?

    <p>Saturation point</p> Signup and view all the answers

    What is the DC load line?

    <p>A line connecting the ideal cutoff and saturation points</p> Signup and view all the answers

    What is the value of VCE at the saturation point?

    <p>VCE = VCE(sat)</p> Signup and view all the answers

    Under what condition does the base-collector junction of a BJT become reverse-biased during active mode?

    <p>When $V_{CE}$ exceeds 0.7 V</p> Signup and view all the answers

    What happens to the collector current ($I_C$) as $V_{CE}$ continues to increase in the active region?

    <p>It levels off and remains constant</p> Signup and view all the answers

    At what condition does the reverse-biased base-collector junction of a BJT go into breakdown?

    <p>When $V_{CE}$ reaches a sufficiently high voltage</p> Signup and view all the answers

    What is represented by the region to the right of point C in a BJT’s characteristic curve?

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

    What describes the condition of a transistor when $I_B = 0$?

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

    What best defines the state of a transistor in cutoff?

    <p>Nonconducting state</p> Signup and view all the answers

    What condition is required for both the BE and BC junctions to be forward-biased in a BJT transistor?

    <p>The base must be at a higher voltage than both the emitter and the collector.</p> Signup and view all the answers

    What happens to $I_C$ when both the BE and BC junctions are forward-biased?

    <p>$I_C$ is zero.</p> Signup and view all the answers

    In the context of BJT transistors, what is typically the value of the base-emitter voltage (VBE) in saturation?

    <p>0.7 V</p> Signup and view all the answers

    What effect does increasing $V_{CC}$ have on $V_{CE}$ in a BJT transistor?

    <p>$V_{CE}$ increases</p> Signup and view all the answers

    What occurs in a BJT transistor when the base is at approximately 0.7 V and both the emitter and collector are at 0 V?

    <p>Both the BE and BC junctions are forward-biased, resulting in saturation.</p> Signup and view all the answers

    What is the effect of the forward-biased BC junction on $V_{CE}$?

    <p>$V_{CE}$ remains below 0.7 V.</p> Signup and view all the answers

    What assumption is made about $V_{BB}$ and $V_{CC}$ when considering saturation in a BJT transistor?

    <p>$V_{BB}$ is set to produce a certain value of $I_B$ and $V_{CC}$ is zero.</p> Signup and view all the answers

    What is the collector characteristic curve primarily used to illustrate?

    <p>The relationship between collector current and collector-emitter voltage.</p> Signup and view all the answers

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