Properties of Electric Materials, Aswan University, Electrical Engineering
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Questions and Answers

What distinguishes the electron energy band structures of insulators and semiconductors when it comes to electron transitions from the valence band to the conduction band?

  • The temperature of the material
  • The number of free electrons
  • The density of the material
  • The size of the energy band gap (correct)

    • What is the main distinguishing factor between a rectifier (diode) and a normal conductor?

  • Rectifiers allow current flow in one direction only (correct)
  • Rectifiers have more holes than electrons
  • Rectifiers are made of copper wire
  • Rectifiers have lower resistance than normal conductors

    • What type of material dominates the p-side of a p–n rectifying junction diode?

  • Holes (correct)
  • Electrons
  • Neutrons
  • Protons

    • What condition is needed in forward bias for a p–n rectifying junction diode?

    <p>Positive battery terminal connected to the p-side</p> Signup and view all the answers

    Which property allows a diode to function as a one-way electrical conductor?

    <p>Energy band gap</p> Signup and view all the answers

    What is the purpose of doping a semiconductor in the construction of a rectifier (diode)?

    <p>To create more holes than electrons</p> Signup and view all the answers

    In a p–n rectifying junction, what happens when the negative terminal is connected to the p-side?

    <p>Creates a barrier to current flow, preventing electrons and holes from recombining</p> Signup and view all the answers

    Which type of transistor has a very thin N-type base region inserted between p-type emitter and collector regions?

    <p>P–N–P junction transistor</p> Signup and view all the answers

    What is the function of the gate in a MOSFET?

    <p>Modifies the channel's conductivity by applying an electric field</p> Signup and view all the answers

    What are the major types of transistors mentioned in the text?

    <p>Junction transistor and MOSFET</p> Signup and view all the answers

    What happens when a positive field is applied to the gate of a MOSFET?

    <p>Drives charge carriers (holes) out of the channel, reducing electrical conductivity</p> Signup and view all the answers

    What type of materials are dielectric materials?

    <p>Electrically insulating and nonmetallic substances</p> Signup and view all the answers

    What is the effect of connecting the negative terminal to the n-side in a p–n rectifying junction?

    <p>Encourages current flow, allowing electrons and holes to recombine</p> Signup and view all the answers

    What is the role of the insulating silicon dioxide layer in a MOSFET?

    <p>Forms an insulating silicon dioxide layer</p> Signup and view all the answers

    In which type of configuration is the Emitter-base junction in a P-N-P junction transistor forward-biased?

    <p>P–N–P configuration</p> Signup and view all the answers

    What dominates in MOSFETs, while junction transistors involve both majority and minority carriers?

    <p>Majority carriers</p> Signup and view all the answers

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