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Semiconductor Electronics: Materials, Devices and Simple Circuits Test 55

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Semiconductor Electronics: Materials, Devices and Simple Circuits Test 55
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  • Question 1
    1 / -0
    Figure shown a DC voltage regulator circuit, with a Zener diode of breakdown voltage = 6V6V. If the unregulated input voltage varies between 10V10 V to 16V16 V, then what is the maximum Zener current ?

    Solution
    Maximum current will flow from zener if input voltage is maximum.
    When zener diode works in breakdown state, voltage across the zener will remain same.
    Vacross4kΩ=6V\therefore V_{across \,4k\Omega} = 6V

    \therefore Current through 4KΩ=64000A=64mA4K\Omega = \dfrac{6}{4000} A = \dfrac{6}{4}mA
    since input voltage =16V= 16V
    \therefore Potential difference across 2KΩ=10V2K\Omega = 10V

    \therefore Current difference across 2KΩ==5mA2K\Omega = \dfrac{}{} = 5mA

    \therefore Current through zener diode
    =(ISIL)=3.5mA= (I_S - I_L) = 3.5 \,mA

  • Question 2
    1 / -0
    At equilibrium, in a p-n junction diode the net current is
    Solution
    At equilibrium, the p-n junction has the same number of majority and minority carriers moving in opposite directions. The net current is the sum of drift current and diffusion current. So the net current will be zero as diffusion and drift currents are equal and opposite.
    Option (C) are correct.
  • Question 3
    1 / -0
    In the given circuit, diode DD is ideal. The potential difference across 4Ω4\Omega resistance is:

    Solution

  • Question 4
    1 / -0
    What is the plate current in a diode valve under the space charge limited operation, when the plate potential is 60 V60\ V? In a diode valve, the plate current is 320 mA320\ mA, when the plate potential is 240240 volts:
    Solution

  • Question 5
    1 / -0
    The impurity added in germanium crystal to make nn- type semi-conductor is:
    Solution

  • Question 6
    1 / -0
    In the given diagram, assume that diode is not ideal. The drift current for diode is 40μA40\mu A. The potential difference across the 4Ω4\Omega resistance is:

    Solution

  • Question 7
    1 / -0
    What is the work function of tungsten at 1500 K1500\ K temperature, when a diode valve with a tungsten filament works at 1500 K1500\ K? Assume the work function of tungsten at 0 K0\ K is 4.52 eV4.52\ eV:
    Solution

  • Question 8
    1 / -0
    In an insulator, band gap of the order of?
    Solution
    In an insulator the forbidden band gap is of the order of 5eV5eV.
  • Question 9
    1 / -0
    The energy gap between conduction band and valence band is of the order of 0.07 eV0.07\ eV. It is a:
    Solution

  • Question 10
    1 / -0
    If the two ends of a p-n junction are joined by a wire,
    Solution

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