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Semiconductor Electronics: Materials, Devices and Simple Circuits Test 17

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Semiconductor Electronics: Materials, Devices and Simple Circuits Test 17
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  • Question 1
    1 / -0
    When an impurity is doped into semiconductor, the conductivity of the semiconductor 
    Solution
    The pure semiconductor has less number of thermally generated charge carriers. But when it is doped with pentavalent or trivalent impurity atoms, the number of charge carriers i.e. electrons and holes increases. So conductivity increases.
  • Question 2
    1 / -0
    The ________________ determines how electrons respond to forces (via the concept of effective mass).
    Solution
    A dispersion relation is a relation between wave vector (k-vector) and energy in a band. A free electron has a dispersion relation $$\epsilon =\dfrac{h^{2}k^{2}}{2m}$$ where m is the electron mass. 
    In the conduction band, the dispersion relation is $$\epsilon =\dfrac{h^{2}k^{2}}{2m^{*}}$$ where m* is the effective mass, so the electron responds to the force as if it had the mass m*.
  • Question 3
    1 / -0
    The transducer used in television transmission works on the principle of
    Solution
    A transducer is an electronic device that converts light energy to electrical energy in television. When light falls on photosensitive element electric current is generated that is measured directly or after amplification. Similarly, photoelectric effect is the ejection of electrons from a metal or semiconductor surface when illuminated by light or any radiation of suitable wavelength.
  • Question 4
    1 / -0
    In an experiment of photoelectric effect the number of photoelectrons has to be increased without changing their frequency. The suitable step to be taken about the incident radiation for this is
    Solution
    Intensity of photons is the number of photons passing through a cross sectional area per unit time. Hence changing the intensity would cause change in number of ejected photoelectrons emitted by them.
  • Question 5
    1 / -0
    The output of AND gate is ____________.
    Solution
    The AND gate gives an output as $$1$$ only when both of its input signals are $$1$$ but gives an output as  $$0$$ when both or either of the input signals is $$0$$.
    In Boolean algebra, output of AND gate is written as   $$Y=A.B$$
  • Question 6
    1 / -0
    Which of the following cannot be used in electronic devices?
    Solution
    Aluminum gallium arsenide, indium gallium arsenide, and gallium arsenide are used in Laser diodes, LEDs, whereas Quasicrystals have poor heat conductivity which makes them good insulators, so not used in electronic devices.
  • Question 7
    1 / -0
    When a hole is produced in P-type semiconductor, there is 
    Solution
    A hole is not itself a physical quantity but a missing electron in valence band. An electron from adjacent site jumps to fill this hole and thus creates a hole at its former site. So it seems as if the hole itself has moved.
  • Question 8
    1 / -0
    The energy gap in case of which of the following is less than $$3 eV$$?
    Solution
    Energy gap of most of the semiconductors is nearly  $$1.1eV$$ which is less than $$3eV$$.
    As we know germanium is a semiconductor and its energy gap is $$0.67eV$$. Thus germanium is the right answer.
  • Question 9
    1 / -0
    Zener-diode is used in.
    Solution
     A voltage regulator circuit can be designed using a zener diode to maintain a constant DC output voltage across the load in spite of variations in the input voltage or changes in the load current. 
  • Question 10
    1 / -0
    The schematic symbol of light emitting diode is (LED)
    Solution
    LED is the light emitting diode i.e. it converts the electrical energy into light energy. Therefore the it emits the light out of the diode. Hence, in symbol of LED the outgoing arrows are shown. Thus option B is correct.
    In option A symbol has arrows are pointing inwards, hence it represents photodiode. Also, option C represent simple diode and option D represents zener diode.
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