B.Sc. Engineering 1st Year: Basic Electronics Mid-Semester Exam
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Questions and Answers

What type of semiconductor material is needed to make a p-type?

  • Trivalent (correct)
  • Tetravalent
  • Pentavalent
  • Hexavalent

    • What is the voltage drop across a combination of a silicon diode and a germanium diode connected in series?

  • The sum of the voltage drops across the two diodes (correct)
  • The forward drop equal to that of the silicon diode
  • The forward drop equal to that of the germanium diode
  • The difference of the voltage drops across the two diodes

    • What is the point of intersection between the characteristic curve of the diode and the resistor's loadline known as?

  • Q-point
  • Point of operation
  • Quiescent point
  • All of the above (correct)

    • What is the direction of the arrow in the diode symbol?

    <p>From p-type of semiconductor to n-type semiconductor material</p> Signup and view all the answers

    What happens to the reverse saturation current of a diode with every 10°C rise in the diode temperature?

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

    What happens to the forward current of a forward-biased diode when the temperature increases?

    <p>Causes forward current to increase</p> Signup and view all the answers

    What is the piecewise linear model, equivalent circuit of the diode composed of?

    <p>A resistor and a voltage source</p> Signup and view all the answers

    What is the DC voltage on the load considering the voltage drop across the Diodes?

    <p>15.563V</p> Signup and view all the answers

    What is the DC power supplied to the load?

    <p>0.2400W</p> Signup and view all the answers

    What is the type of semiconductor material obtained by introducing pentavalent impurities into silicon?

    <p>N-type</p> Signup and view all the answers

    What is the conversion efficiency of this rectifier?

    <p>0.7685pu</p> Signup and view all the answers

    What is the peak value of the AC current?

    <p>0.02400A</p> Signup and view all the answers

    What is the RMS value of the current supplied to the circuit?

    <p>0.017680A</p> Signup and view all the answers

    What is the AC power supplied to the whole circuit?

    <p>0.31267A</p> Signup and view all the answers

    What determines the energy level of an electron in an atom?

    <p>The distance from the electron to the nucleus</p> Signup and view all the answers

    Which of the following statements about an electron's energy level is true?

    <p>Electrons in the innermost shell have the highest energy level</p> Signup and view all the answers

    What is the characteristic of a linear component?

    <p>The current is proportional to the applied voltage</p> Signup and view all the answers

    Which of the following is an example of a linear component?

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

    What is Ohm's law?

    <p>A law that states that current is proportional to voltage</p> Signup and view all the answers

    What is the relationship between voltage and current in a linear component?

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

    What is the characteristic of a non-linear component?

    <p>The current is non-proportional to the applied voltage</p> Signup and view all the answers

    What is the purpose of the scannable sheet in the examination?

    <p>To submit the answers to the questions</p> Signup and view all the answers

    What components are required to test a diode?

    <p>A battery, a small resistor, and the ideal diode</p> Signup and view all the answers

    What should the resistances of a diode be in the forward and reverse directions?

    <p>Relatively low in the forward direction and relatively high in the reverse direction</p> Signup and view all the answers

    What region occurs when the diode is reverse-biased?

    <p>Depletion region</p> Signup and view all the answers

    What happens to the current and voltage across the diode in the Zener region?

    <p>The current can increase a lot and the voltage is almost constant</p> Signup and view all the answers

    Under what condition does the diffusion capacitance of a diode occur?

    <p>When the diode is large</p> Signup and view all the answers

    When does a light-emitting diode emit light?

    <p>When the p-n junction is forward-biased</p> Signup and view all the answers

    What type of capacitance occurs when the diode is reverse-biased?

    <p>Transition capacitance</p> Signup and view all the answers

    What are the two most common semiconductor materials?

    <p>Silicon and germanium</p> Signup and view all the answers

    What has led to the primary purpose of the container being to provide a means for physical handling?

    <p>The miniaturization of electronic devices</p> Signup and view all the answers

    What type of impurities cause holes to be the majority carriers?

    <p>Hexavalent impurities</p> Signup and view all the answers

    What is an advantage of the miniaturization of electronic devices?

    <p>They are more compact</p> Signup and view all the answers

    Which device is roughly equivalent to a diode?

    <p>A one-way valve</p> Signup and view all the answers

    What is the purpose of a diode test setting on an ohmmeter?

    <p>To test the diode in the forward and reverse directions</p> Signup and view all the answers

    What is the ideal diode used for in testing?

    <p>To simulate an ideal diode characteristic</p> Signup and view all the answers

    What happens to the depletion region when a diode is reverse-biased?

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

    What is a conducting forward-biased diode equivalent to?

    <p>A closed switch</p> Signup and view all the answers

    Study Notes

    COE/EE 152: BASIC ELECTRONICS

    Energy Level of Electrons

    • Energy level of an electron: Electrons in the outermost shell have the highest energy level.

    Linear Component

    • Linear component: an increase in current is proportional to the applied voltage as given by Ohm's law.
    • Example of a linear component: Resistor.

    Semiconductor Material

    • Doping material needed to make a p-type semiconductor material: trivalent.
    • Doping material needed to make an n-type semiconductor material: pentavalent.

    Diodes

    • The point of intersection between the characteristic curve of the diode and the resistors loadline: Q-point or point of operation or quiescent point.
    • Direction of the arrow in the diode symbol: from p-type of semiconductor to n-type semiconductor material.
    • Reverse saturation current of a diode: doubles for every 10°C rise in the diode temperature.
    • Effect of increasing temperature on a forward-biased diode: increases forward current.

    Diode Testing

    • Testing a diode with an ohmmeter: check its resistance in the forward and reverse direction.
    • Resistances of a diode: relatively low in the forward direction and relatively high in the reverse direction.

    Zener Region

    • Current in the Zener region: can increase a lot.
    • Voltage across the diode in the Zener region: is almost constant.

    Light-Emitting Diodes

    • Conditions for light emission in a p-n junction: forward-biased.

    Semiconductor Devices

    • Advantage of miniaturization: they operate more efficiently.
    • Container purpose: provide a means for physical handling.

    Capacitance

    • Diffusion capacitance: a shunt capacitance effect that occurs when the diode is forward-biased.
    • Transition capacitance: a shunt capacitive effect that occurs when the diode is reverse-biased.

    Semiconductor Materials

    • Two most common semiconductor materials: Silicon and Germanium.

    Doping

    • Doping: the process of adding impurities to pure semiconductor material.
    • Effect of trivalent impurities: cause holes to be the majority carriers.
    • Effect of pentavalent impurities: cause electrons to be the majority carriers.

    Diode Equivalent

    • Device roughly equivalent to a diode: a one-way valve.

    Depletion Region

    • Depletion region: acts as an insulator and the dielectric value is proportional to barrier potential.
    • Effect of reverse bias on the depletion region: it increases.

    Forward-Biased Diode

    • A conducting forward-biased diode: behaves like a short circuit.

    Rectifier Circuits

    • DC Voltage on the load: depends on the voltage drop across the diodes.
    • DC power supplied to the load: depends on the voltage drop across the diodes and the load resistance.
    • Conversion efficiency of a rectifier: depends on the AC voltage, DC voltage, and power supplied.
    • Peak value of the AC current: depends on the load resistance and the AC voltage.
    • RMS value of the current supplied to the circuit: depends on the load resistance and the AC voltage.
    • AC power supplied to the whole circuit: depends on the voltage and current.

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    Description

    Mid-semester exam questions for B.Sc. Engineering 1st year students at Kwame Nkrumah University of Science and Technology, covering basic electronics topics.

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