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ECE :: Electronic Devices and Circuits

  1. The resistivity of a semiconductor

  2. A.
    increases as the temperature increases
    B.
    decreases as the temperature increases
    C.
    remains constant even when temperature varies
    D.
    none of the above

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  3. The voltage at which Avalanche occurs is known as

  4. A.
    cut in voltage
    B.
    barrier voltage
    C.
    breakdown voltage
    D.
    depletion voltage

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  5. If the energy gap of a semiconductor is 1.1 eV, then it would be

  6. A.
    opaque to visible light
    B.
    transparent to visible light
    C.
    transparent to ultraviolet radiation
    D.
    transparent to infrared radiation

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  7. In intrinsic semiconductor the increase in conductivity per degree increase in temperature is about

  8. A.
    2%
    B.
    6%
    C.
    15%
    D.
    25%

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  9. The ripple factor for a bridge rectifier is

  10. A.
    0.406
    B.
    1.21
    C.
    1.11
    D.
    2.22

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  11. Which of the following semi-conductor has forbidden energy gap less 1 eV?

  12. A.
    Sulphur
    B.
    Phosphorous
    C.
    Germanium
    D.
    Carbon

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  13. In the vacuum diode equation ib = keb1.5, the current is

  14. A.
    temperature limited current
    B.
    space charge limited current
    C.
    any of the above
    D.
    none of the above

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  15. Thermosetting polymers are

  16. A.
    injection moulded
    B.
    extruded
    C.
    cast moulded
    D.
    none of the above

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  17. Which of these is used in seven segment display?

  18. A.
    PIN diode
    B.
    LED
    C.
    Photo diode
    D.
    Tunnel diode

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  19. The current in a p-n junction diode with V volts applied in p region relative to n region (where I0 is reverse saturation current, m is ideality factor, k is Boltzmann's constant, T is absolute temp and q is charge on electron) is

  20. A.
    I0 (e-qV/mkT - 1)
    B.
    I0 e-qV/mkT
    C.
    I0 (eqV/mkT)
    D.
    I0 (eqV/mkT - 1)

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