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ECE :: Electronic Devices and Circuits

  1. The most commonly used semiconductor material is

  2. A.

     Silicon

    B.

     Germanium

    C.

     Mixture of silicon and germanium

    D.

     None of the above

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  3. Permalloy is

  4. A.

     A variety of stainless steel

    B.

     A polymer

    C.

     A conon-ferrous alloy used in aircraft industry

    D.

     A nickel an iron alloy having high permeability

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  5. Which one of the following is not a characteristic of a ferroelectric material?

  6. A.

     High dielectric constant

    B.

     No hysteresis

    C.

     Ferroelectric characteristic only above the curie point

    D.

     Electric dipole moment

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  7. In which of these is reverse recovery time nearly zero?

  8. A.

     Zener diode

    B.

     Tunnel diode

    C.

     Schottky diode

    D.

     PIN diode

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  9. Hall effect is observed in a specimen when it is carrying current and is placed in a magnetic field. The resultant electric field inside the specimen is

  10. A.

     Normal to both current and magnetic field

    B.

     In the direction of current

    C.

     Antiparallel to magnetic field

    D.

     In arbitrary direction

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  11. Fermi level is the amount of energy in which

  12. A.

     A hole can have at room temperature

    B.

     An electron can have at room temperature

    C.

     Must be given to an electron move to conduction band

    D.

     None of the above

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  13. In monolithic ICs, all the components are fabricated by

  14. A.

     Diffusion process

    B.

     Oxidation

    C.

     Evaporation

    D.

     None

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  15. When diodes are connected in series to increase voltage rating the peak inverse voltage per junction

  16. A.

     should not exceed half the breakdown voltage

    B.

     should not exceed the breakdown voltage

    C.

     should not exceed one third the breakdown voltage

    D.

     may be equal to or less than breakdown voltage

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