Physical electronics devices and ics miscellaneous

Physical electronics devices and ics miscellaneous

Easy Questions

Physical Electronics Devices and ICs

Physical electronics devices and ics miscellaneous
  1. If the load resistance decreases in a zener regulator, the zener current—








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    If the load resistance decreases in a zener regulator the zener current increases because


    Correct Option: B

    If the load resistance decreases in a zener regulator the zener current increases because


  1. Match List-I with List-II and select the correct answer using the code given below the lists—
    List-I
    (a) Gunn Diode
    (b) Solar Cell
    (c) MOSFET
    (d) SCR
    List-II
    1. Junctionless device
    2. Single junction device
    3. Double junction device
    4. Triple junction device Codes:








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    ● Gunn diode → Junction less device
    ● Solar cell → Single junction device
    ● MOSFET → Double junction device
    ● SCR → Triple junction device

    Correct Option: A

    ● Gunn diode → Junction less device
    ● Solar cell → Single junction device
    ● MOSFET → Double junction device
    ● SCR → Triple junction device

  1. Match List-I (Diode type) with List-II (Important properties) and select the correct answer using the code given below the lists—
    List-I
    (a) Zener Diode
    (b) Gunn Diode
    (c) Schottky Diode
    (d) Tunnel Diode
    List-II
    1. Negative resistance device fabricated using semiconductors like Si, Ga, As, Ge etc. can be operated at a frequency of 10 GHz.
    2. Quantum mechanical tunnelling with very thin depletions layers under reverse bias operated as a reference voltage sources.
    3. Negative conductance device, operates on the principle of transfer of electron from one region of conduction band to another.
    4. Metal-semiconductor diode, have rectification properties. Codes:








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    ● Zener diode → Quantum mechanical tunnelling with very thin depletion layers under reverse bias operated as a reference voltage sources.
    ● Gunn diode → Negative conductance device, operates on the principle of transfer of electrons from one region of conduction band to another.
    ● Schottky Diode → Metal-semiconductor diode, have rectification properties.
    ● Tunnel diode → Negative resistance device fabricated using semiconductors like Si, Ga, As, Ge etc. can be operated at a frequency of 10 GHz.

    Correct Option: C

    ● Zener diode → Quantum mechanical tunnelling with very thin depletion layers under reverse bias operated as a reference voltage sources.
    ● Gunn diode → Negative conductance device, operates on the principle of transfer of electrons from one region of conduction band to another.
    ● Schottky Diode → Metal-semiconductor diode, have rectification properties.
    ● Tunnel diode → Negative resistance device fabricated using semiconductors like Si, Ga, As, Ge etc. can be operated at a frequency of 10 GHz.

  1. A zener diode in the circuit shown in the figure below, has a knee current of 5 mA and a maximum allowed power dissipation of 300 mW. What are the minimum and maximum load currents that can be drawn safely from the circuit, keeping the output voltage V0 at 6 V?










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    The given circuit (i.e., fig)
    Given, IZK = 5 mA, V0 = VZ = 6V, RS = 50 Ω, Vi = 9V

    PZM = 300 mW or IZ(max) =
    PZM
    		=
    300 mW
    		= 64 mA
    VZ6V

    = 50 mA
    From figure, I S =
    Vi – VZ
    		=
    9 - 6
    		=
    3
    		= 60 mA
    RS5050

    Now, IL(min) = IS – IZ(max) = 60 – 50 = 10 mA
    IL(max) = IS – IZK = 60 – 5 = 55 mA
    Hence alternative (C) is the correct choice.


    Correct Option: C

    The given circuit (i.e., fig)
    Given, IZK = 5 mA, V0 = VZ = 6V, RS = 50 Ω, Vi = 9V

    PZM = 300 mW or IZ(max) =
    PZM
    		=
    300 mW
    		= 64 mA
    VZ6V

    = 50 mA
    From figure, I S =
    Vi – VZ
    		=
    9 - 6
    		=
    3
    		= 60 mA
    RS5050

    Now, IL(min) = IS – IZ(max) = 60 – 50 = 10 mA
    IL(max) = IS – IZK = 60 – 5 = 55 mA
    Hence alternative (C) is the correct choice.


  1. Match List-I (Devices) with List-II (Property) and select the correct answer using the code given below the lists—
    List-I
    (a) Silicon diode
    (b) Germanium diode
    (c) LED
    (d) PIN diode
    List-II
    1. High frequency applications
    2. Very low reverse bias saturation current
    3. Low forward bias voltage drop
    4. Cut-off wavelength Codes:








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    ● Silicon diode → Very low reverse bias
    ● Germanium diode → Low forward bias voltage drop
    ● LED → Cut-off wavelength
    ● PIN diode → High frequency applications

    Correct Option: D

    ● Silicon diode → Very low reverse bias
    ● Germanium diode → Low forward bias voltage drop
    ● LED → Cut-off wavelength
    ● PIN diode → High frequency applications