Atomic Structure and Elements
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Atomic Structure and Elements

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Questions and Answers

What is the smallest particle of an element that still retains the characteristics of that element?

  • An atom (correct)
  • A proton
  • An electron
  • A molecule

    • What is the charge of an electron?

  • Zero
  • Variable
  • Negative (correct)
  • Positive

    • What is the number of protons and electrons in a helium atom?

  • One proton and one electron
  • Four protons and four electrons
  • Two protons and two electrons (correct)
  • Three protons and three electrons

    • What is the main difference between a proton and a neutron?

    <p>Protons are positively charged, neutrons are uncharged</p> Signup and view all the answers

    What is the mass of a proton relative to an electron?

    <p>1836 times greater</p> Signup and view all the answers

    What is the structure of an atom according to the Bohr theory?

    <p>A central nucleus surrounded by orbiting electrons</p> Signup and view all the answers

    What happens to the resistivity of silicon and germanium as the temperature increases?

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

    Why should silicon not operate at a working temperature above 150°C to 200°C?

    <p>It may lose its semiconducting properties</p> Signup and view all the answers

    What happens to the resistivity of a semiconductor as the temperature decreases?

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

    What is the number of valence electrons in silicon and germanium?

    <p>4</p> Signup and view all the answers

    What is the effect of incidence of light on the conductivity of semiconductors?

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

    What is the classification of semiconductors with impurities?

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

    What proportion of the holes passing into the base from the emitter can pass through the base-collector junction?

    <p>0.995</p> Signup and view all the answers

    What is the direction of the leakage current in an n-p-n transistor?

    <p>From the collector to the base</p> Signup and view all the answers

    What is the relation between the emitter current and the sum of the collector and base current?

    <p>IE = IC + IB</p> Signup and view all the answers

    What is the typical value of IC in terms of IE?

    <p>0.99 IE</p> Signup and view all the answers

    What is the purpose of the base-collector junction in a p-n-p transistor?

    <p>To forward bias the minority carriers</p> Signup and view all the answers

    What is the name of the current that flows from the collector to the base due to thermally generated minority carriers?

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

    What is the ratio of IE, IC, and IB currents in a transistor configuration?

    <p>1: α : (1 - α)</p> Signup and view all the answers

    In a common-emitter configuration, what is the typical output resistance?

    <p>Kilo ohms</p> Signup and view all the answers

    What happens to the collector current in a common-emitter configuration?

    <p>It reduces to zero without reversing the collector voltage</p> Signup and view all the answers

    What is the shape of the characteristic obtained when VEB is varied?

    <p>Similar to the input characteristic for a common-base configuration</p> Signup and view all the answers

    What is the difference between the output characteristics of n-p-n and p-n-p transistors?

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

    What is the direction of the slope of the output characteristics in a common-emitter configuration?

    <p>Sloping upwards</p> Signup and view all the answers

    What type of transistor is being discussed alongside BJT?

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

    What is the purpose of feedback in electronic circuits?

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

    What is the difference between open and closed loop control systems?

    <p>Type of feedback</p> Signup and view all the answers

    What is the role of the signal combination in a feedback system?

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

    What is the effect of negative feedback on an amplifier?

    <p>It decreases the gain</p> Signup and view all the answers

    What is the name of the theorem discussed in the chapter?

    <p>Feedback Theorem</p> Signup and view all the answers

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