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ECE :: Electronic Devices and Circuits

  1. The current due to thermionic emission is given by Richardson Dushman equation.

  2. A.
    True
    B.
    False

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  3. The thermionic emission current is given by

  4. A.
    Fermi-Dirac distribution
    B.
    Maxwell's equation
    C.
    Richardson Dushman equation
    D.
    Langmuir Child law

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  5. In forward active region, the operation of a BJT

  6. A.
    both junctions are forward biased
    B.
    both junctions are reverse biased
    C.
    emitter base junction is forward biased and base collector junction is reverse biased
    D.
    emitter base junction is reverse biased and base collector junction is reverse biased

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  7. The conductivity of a semiconductor crystal due to any current carrier is not proportional to

  8. A.
    mobility of the carrier
    B.
    effective density of states in the conduction band
    C.
    electronic charge
    D.
    surface states in the semiconductor

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  9. A P-N junction diode dynamic conductance is directly proportional to

  10. A.
    the applied voltage
    B.
    the temperature
    C.
    its current
    D.
    thermal voltage

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  11. The Ni-Zn ferrites are used for audio and TV transformers is that

  12. A.
    they have large saturation magnetisation
    B.
    they are easy to fabricate by rolling
    C.
    they are free from pores and voids
    D.
    they have high electro-resistivity

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  13. Hall's effect can be used to measure

  14. A.
    magnetic field intensity
    B.
    average number of holes
    C.
    carriers concentration
    D.
    electrostatic field intensity

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  15. For insulators the energy gap is of the order of

  16. A.
    0.1 eV
    B.
    0.7 eV
    C.
    1.1 eV to 1.2 eV
    D.
    5 to 15 eV

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  17. When electronic emission occurs due to bombardment of high velocity electrons on a metal surface, it is called secondary emission.

  18. A.
    True
    B.
    False

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  19. The reverse saturation current depends on the reverse bias.

  20. A.
    True
    B.
    False

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