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ECE :: Electronic Devices and Circuits

  1. Ferrities are particularly suited for high frequency applications because of their

  2. A.
    low distortion
    B.
    low eddy current loss
    C.
    high conductivity
    D.
    high mobility

  3. In intrinsic semiconductor, the fermi level

  4. A.
    lies at the centre of forbidden energy gap
    B.
    is near the conduction band
    C.
    is near the valence band
    D.
    may be anywhere in the forbidden energy gap

  5. Electromagnetic waves transport

  6. A.
    energy only
    B.
    momentum only
    C.
    energy as well as momentum
    D.
    neither energy nor momentum

  7. In a forward biased p-n junction current enters p material as hole current and leaves n material as electron current of the same magnitude.

  8. A.
    True
    B.
    False

  9. When P-N junction is in forward bias, by increasing the battery voltage

  10. A.
    current through P-N junction reduces
    B.
    current through P-N junction increases
    C.
    circuit resistance increases
    D.
    none of the above

  11. A semiconductor in its purest form called

  12. A.
    intrinsic semiconductor
    B.
    extrinsic semiconductor
    C.
    P-type semiconductor
    D.
    N-type semiconductor

  13. Which of the following is an active device?

  14. A.
    Transformer
    B.
    Silicon controlled rectifier
    C.
    Electric bulb
    D.
    Loudspeaker

  15. Assertion (A): The forward dynamic resistance of p-n diode varies inversely with current.

    Reason (R): The forward dynamic resistance of p-n diode varies with the operating voltage.

  16. 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

  17. If E (i.e., available energy state) = EF(i.e., Fermi level), then probability that state E will be occupied is 0.5 for any temperature T.

  18. A.
    True
    B.
    False

  19. CE saturation resistance of n-p-n transistor is