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ECE :: Electronic Devices and Circuits

  1. When a ferromagnetic substance is magnetised, there are small changes in its dimensions. This phenomenon is called

  2. A.
    hysteresis
    B.
    magnetostriction
    C.
    diamagnetism
    D.
    bipolar relaxation

  3. Gold is often diffused into silicon PN junction devices to

  4. A.
    increase the recombination rate
    B.
    reduce the recombination rate
    C.
    make silicon a direct gap semiconductor
    D.
    make silicon semimetal

  5. In the figure shows the circuits symbol of

  6. A.
    FET
    B.
    PMOSFET
    C.
    CMOSFET
    D.
    NMOSFET

  7. Assertion (A): FET is a unipolar device.

    Reason (R): BJT is bipolar device.

  8. A.
    Both A and R are true and R is correct explanation of A
    B.
    Both A and R are true but R is not a correct explanation of A
    C.
    A is true but R is false
    D.
    A is false but R is true

  9. Ferrites are

  10. A.
    ferromagnetic materials
    B.
    ferrimagnetic materials
    C.
    ferroelectric materials
    D.
    ferri-ferromagnetic materials

  11. In a p-n-p transistor the main current carriers and the mechanism of flow respectively are

  12. A.
    electrons, drift
    B.
    holes, drift
    C.
    holes, diffusion
    D.
    electrons, diffusion

  13. Secondary emission occurs in

  14. A.
    diode
    B.
    triode
    C.
    tetrode
    D.
    pentode

  15. In common base connection, the output characteristics of a bipolar junction transistor is drawn between

  16. A.
    IC and VCB
    B.
    IC and VCE
    C.
    IE and VCB
    D.
    IE and VCE

  17. In fabricating silicon BJT in ICs by the epitaxial process, the number of diffusions used is usually

  18. A.
    2
    B.
    3
    C.
    4
    D.
    6

  19. Consider the following statements about diamagnetic material and diamagnetism.

    1. The materials have negative magnetic susceptibility.
    2. At very low temperature diamagnetic materials.
    Which of the statements given above is/are correct?

  20. A.
    1 only
    B.
    2 only
    C.
    Both 1 and 2
    D.
    neither 1 nor 2