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ECE :: Electronic Devices and Circuits

  1. AE 139 is a

  2. A.
    tunnel diode
    B.
    germanium power transistor
    C.
    photoconductive cell
    D.
    silicon diode

  3. The function off an oxide layer in an IC device is to

    1. mask against diffusion or ion implantation
    2. insulate the surface electrically
    3. increase the melting point of Si
    4. produce a chemically stable protective layer

  4. A.
    1, 2, 3
    B.
    1, 3, 4
    C.
    2, 3, 4
    D.
    4, 1, 2

  5. The passage of current in an electrolyte is due to the movement of

  6. A.
    electrons
    B.
    molecules
    C.
    atoms
    D.
    ions

  7. In a CE bipolar transistor operating in active region, collector current is independent of

  8. A.
    VCE
    B.
    IB
    C.
    both VCE and IB
    D.
    none of the above

  9. When a normal atom loses an electron

  10. A.
    the atom loses one-proton simultaneously
    B.
    rest of the electrons move faster
    C.
    the atom becomes a positive ion
    D.
    the atom becomes a negative ion

  11. The main purpose of using transformer coupling in a class A amplifier is to make it more

  12. A.
    efficient
    B.
    less costly
    C.
    less bulky
    D.
    distortion free

  13. The effective channel length of a MOSFET in saturation decreases with increase in

  14. A.
    gate voltage
    B.
    drain voltage
    C.
    source voltage
    D.
    body voltage

  15. Which of the following element does not have three valence electrons?

  16. A.
    Boron
    B.
    Aluminium
    C.
    Gallium
    D.
    Phosphorus

  17. Which of the following is used in the sterilization of water?

  18. A.
    Hydrogen bromide
    B.
    Oxygen
    C.
    Ozone
    D.
    Caustic potash

  19. Electrons within a metal have energy levels from zero to Fermi level EF.

  20. A.
    True
    B.
    False