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Semiconductor Electronics Model Question Paper

12th Standard

    Reg.No. :
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Physics

Time : 01:00:00 Hrs
Total Marks : 40
    5 x 1 = 5
  1. The zener diode is primarily used as ______.

    (a)

    Rectifier

    (b)

    Amplifier

    (c)

    Oscillator

    (d)

    Voltage regulator

  2. The principle based on which a solar cell operates is______.

    (a)

    Diffusion

    (b)

    Recombination

    (c)

    Photovoltaic action

    (d)

    Carrier flow

  3. The specific characteristic of a common emitter amplifier is _______________.

    (a)

    High input resistance

    (b)

    Low power gain

    (c)

    Signal phase reversal

    (d)

    Low current gain

  4. By adding _________ impurity in intrinsic semi conductor, p type semiconductor is made. Charge of these p type semiconductor is ____________

    (a)

    Trivalent, neutral

    (b)

    Pentaralent, neutral

    (c)

    Pentavalent, positive

    (d)

    Trivalent, negative

  5. The intrinsic semi-conductor has ______________.

    (a)

    A finite resistance which does not change with temperature

    (b)

    Infinite resistance which decreases with temperature

    (c)

    Finite resistance which decreases with temperature

    (d)

    Finite resistance which does not change with temperature

  6. 5 x 2 = 10
  7. What do you mean by leakage current in a diode?

  8. Explain the current flow in a NPN transistor.

  9. Give circuit symbol, logical operation, truth table, and Boolean expression of
    i) AND gate
    ii) OR gate
    iii) NOT gate
    iv) NAND gate
    v) NOR gate and
    vi) EX-OR gate.

  10. What is barrier potential?

  11. What is forward V-I characteristics?

  12. 5 x 3 = 15
  13. State and prove De Morgan’s first and second theorem.

  14. In a transistor connected in the common base configuration, \(\alpha\) = 0 95, IE = 1 mA. Calculate the values of IC and IB.

  15. Give the Schematic representation of valence band, conduction band, and forbidden energy gap and draw energy band structure of
    (a) Insulators
    (b) Semiconductors
    (c) Metals?

  16. What is electronics?

  17. 2 x 5 = 10
  18. A transistor having α = 0.99 and VBE = 0.7V, is connected in the common-cmiitter configuration as shown in figure. If the transister is in saturation region, find the value of the collector current.

  19. Prove the Boolean identity AC + ABC = AC and give its circuit description.

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