Home / ECE / Electronic Devices and Circuits :: Section 15

ECE :: Electronic Devices and Circuits

  1. The product kT (where k is Boltzmann's constant and T is absolute temperature) at room temperature is about

  2. A.
    0.051 eV
    B.
    0.026 eV
    C.
    0.01 eV
    D.
    0.001 eV

    View Answer

    Workspace

    Discuss Discuss in Forum


  3. If E is energy level of electron and EF is fermi level, and T = 0 and E > EF, then

  4. A.
    the probability of finding an occupied quantum state of energy higher than EF is zero
    B.
    all quantum states with energies greater than EF are occupied
    C.
    some quantum states with energies greater than EF are occupied
    D.
    majority of quantum states with energies greater than EF are occupied

    View Answer

    Workspace

    Discuss Discuss in Forum


  5. Which variety of copper has the best conductivity?

  6. A.
    Pure annealed copper
    B.
    Hard drawn copper
    C.
    Induction hardened copper
    D.
    Copper containing traces of silicon

    View Answer

    Workspace

    Discuss Discuss in Forum


  7. In a JFET VDS exceeds the rated value. Then it operates in

  8. A.
    active region
    B.
    ohmic region
    C.
    cut off region
    D.
    either cut off or active region

    View Answer

    Workspace

    Discuss Discuss in Forum


  9. Figure represents a

  10. A.
    Diode rectifier
    B.
    Schottky diode
    C.
    Varistor
    D.
    None of the above

    View Answer

    Workspace

    Discuss Discuss in Forum


  11. The output, V-I characteristics of an Enhancement type MOSFET has

  12. A.
    only an ohmic region
    B.
    only a saturation region
    C.
    an ohmic region at low voltage value followed by a saturation region at higher voltages
    D.
    an ohmic region at large voltage values preceded by a saturation region at lower voltages

    View Answer

    Workspace

    Discuss Discuss in Forum


  13. Piezoelectric quartz crystal resonators find application where

  14. A.
    signal amplification is required
    B.
    rectification of the signal is required
    C.
    signal frequency control is required
    D.
    modulation of signal is required

    View Answer

    Workspace

    Discuss Discuss in Forum


  15. The forbidden energy gap between the valence band and conduction band will be least in case of

  16. A.
    metals
    B.
    semiconductors
    C.
    insulators
    D.
    all of the above

    View Answer

    Workspace

    Discuss Discuss in Forum


  17. If too large current passes through the diode

  18. A.
    all electrons will leave
    B.
    all holes will freeze
    C.
    excessive heat may damage the diode
    D.
    diode will emit light

    View Answer

    Workspace

    Discuss Discuss in Forum


  19. Figure shows the terminals of a transistor in plastic package TO 18. Then

  20. A.
    terminals 1, 2, 3 are emitter, collector, base respectively
    B.
    terminals 1, 2, 3 are emitter, base, collector respectively
    C.
    terminals 1, 2, 3 are base, emitter collector, respectively
    D.
    terminals 1, 2, 3 are collector, emitter, base respectively

    View Answer

    Workspace

    Discuss Discuss in Forum