Zener Diode Breakdown
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Questions and Answers

What is the term used to describe the breakdown of a Zener diode?

  • Zener effect
  • Avalanche effect
  • Zener breakdown (correct)
  • Ionization effect

    • What is the main reason for the large current at breakdown in a Zener diode?

  • Strong electric field near the junction
  • Two factors: Zener and avalanche effects (correct)
  • High reverse bias voltage
  • Increased kinetic energy of charged carriers

    • What happens to the electrons in the covalent bonds at voltages up to about 5 V?

  • They remain in the bonds
  • They collide with other atoms
  • They move through the crystal lattice
  • They are pulled out of the bonds (correct)

    • What is the result of the avalanche effect in a Zener diode?

    <p>Increased reverse current</p> Signup and view all the answers

    What is the condition required for a Zener diode to be operated in the breakdown region without damage?

    <p>Limited current by external resistance</p> Signup and view all the answers

    What type of diode behaves similarly to a Zener diode in the forward direction?

    <p>Signal diode</p> Signup and view all the answers

    What is the typical potential difference between the collector and emitter of a silicon transistor?

    <p>6 V</p> Signup and view all the answers

    What is the main reason why a small change in voltage between the emitter and base can lead to a large change in current?

    <p>Because of the potential barrier reduction</p> Signup and view all the answers

    What are the three types of transistor connections classified by?

    <p>The electrode that is common to both the input and the output</p> Signup and view all the answers

    What would happen if the voltage between the base and emitter is raised to 0.62 V?

    <p>The collector current will double</p> Signup and view all the answers

    What is the term used to describe the graphical representation of a transistor circuit's behavior?

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

    How does the direction of current flow change in a p-n-p transistor?

    <p>It is reversed</p> Signup and view all the answers

    What is the primary function of a transistor in electronic circuits?

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

    What happens when the majority carriers cross the junction in a PN-diode?

    <p>The depletion layer is reduced</p> Signup and view all the answers

    What is thermal runaway in a transistor?

    <p>An uncontrollable increase in the current flowing through the transistor</p> Signup and view all the answers

    What is the main difference between Zener breakdown and avalanche breakdown in a PN-junction diode?

    <p>The mechanism of the breakdown process</p> Signup and view all the answers

    What is the name of the transistor configuration where the base is common to both the input and output circuits?

    <p>Common-base</p> Signup and view all the answers

    What is the ideal diode?

    <p>A diode with zero voltage drop</p> Signup and view all the answers

    What is the purpose of the static characteristic curves?

    <p>To provide information on the current flowing into or out of a terminal</p> Signup and view all the answers

    How many sets of characteristic curves can be plotted for each transistor configuration?

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

    What is the input to a common-base transistor?

    <p>Emitter current</p> Signup and view all the answers

    What is the effect of varying the collector-base voltage VCB on the input characteristic curve?

    <p>It has little effect on the curve</p> Signup and view all the answers

    What type of junction is the base-emitter junction in a common-base transistor?

    <p>Forward-biased junction diode</p> Signup and view all the answers

    What is the name of the curve shown in Figure 2.12?

    <p>Input characteristic curve</p> Signup and view all the answers

    What primarily determines the value of the collector current IC?

    <p>Emitter current IE</p> Signup and view all the answers

    What is the effect of making VCB slightly negative?

    <p>IC falls rapidly to zero</p> Signup and view all the answers

    What is the name of the graph shown in Figure 2.13?

    <p>Output Characteristics</p> Signup and view all the answers

    In a common-emitter configuration, what is the input current?

    <p>Base current IB</p> Signup and view all the answers

    What is the relationship between the currents IE, IC, and IB?

    <p>IE : IC : IB = 1 : : (1 - )</p> Signup and view all the answers

    What is the difference between the characteristics of an n-p-n and p-n-p transistor?

    <p>They have reversed polarities</p> Signup and view all the answers

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