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ECE :: Electronic Devices and Circuits

  1. Gel is

  2. A.
    a polymer having side groups distributed randomly along a vinly polymer chain
    B.
    a polymer having secondary chains branching from the main molecular chain
    C.
    a solid frame work of colloidal particles linked together and containing a fluid
    D.
    a polymer in which the repeating unit of each molecule has vinyl group

  3. When a P-N junction is unbiased, the junction current at equilibrium is

  4. A.
    zero as no charges cross the junction
    B.
    zero as equal number of carriers cross the barrier
    C.
    mainly due to diffusion of majority carriers
    D.
    mainly due to diffusion of minority carriers

  5. Which one of the following material has the highest dielectric strength?

  6. A.
    Porcelain
    B.
    Soft rubber
    C.
    Glass
    D.
    polystyrene

  7. Assertion (A): In p type semiconductor conduction is mainly due to holes.

    Reason (R): In p type material the holes are majority carriers.

  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. In common base configuration, the input characteristics of bipolar junction transistor are drawn between

  10. A.
    VEB and IE
    B.
    VCB and IC
    C.
    IC and VCE
    D.
    IE and VCE

  11. Fermi level is the maximum energy that an electron can possess at 0 K.

  12. A.
    True
    B.
    False

  13. The voltage across the secondary of the transformer in a half wave rectifier (without any filter circuit) is 25 volts. The maximum voltage on the reverse biased diode will be

  14. A.
    100 V
    B.
    50 V
    C.
    25 V
    D.
    12.5 V

  15. The residual resistivity of a binary alloy at 0°K is

  16. A.
    the sum of the residual resistivities of the component metals
    B.
    the difference of the residual resistivities of the component metals
    C.
    the product of the residual resistivities of the component metals
    D.
    depend on the concentration of the minor component in the alloy

  17. Which of the following insulating material is restricted to temperatures below 100°C?

  18. A.
    Micanite
    B.
    Asbestos
    C.
    Teflon
    D.
    Polythene

  19. - ve feedback in an amplifier

  20. A.
    reduces gain
    B.
    increase frequency and phase distortion
    C.
    reduce bandwidth
    D.
    increase noise