Home / ECE / Analog Electronics :: Section 12

ECE :: Analog Electronics

  1. Which of the following circuits can operate class AB for audio power output?

  2. A.
    Emitter follower
    B.
    Push pull
    C.
    Cascade
    D.
    Darlington pair

  3. In a P-N-P transistor, with normal bias

  4. A.
    the collector junction has negligible resistance
    B.
    only holes cross the collector junction
    C.
    the collector-base junction is reverse biased and the emitter base junction is forward biased
    D.
    only majority carriers cross the collector junction

  5. If Rs is the sources resistance, the O/P resistance of an emitter follower using the simplified hybrid model would be


  6. A D.C. amplifier amplify

  7. A.
    D.C. only
    B.
    A.C. only
    C.
    both A.C. and D.C.
    D.
    none of the above.

  8. In common base amplifier the current gain is less than one, but the voltage gain may be anywhere from

  9. A.
    0.5 to 1
    B.
    1 to 5
    C.
    5 to 10
    D.
    50 to 2000

  10. Figure represents

  11. A.
    Integrator
    B.
    Differentiator
    C.
    High Pass Filter
    D.
    Band Pass Filter

  12. In a class C operation

  13. A.
    VCC is much larger than VCE(sat)
    B.
    VCC is much smaller than VCE(sat)
    C.
    VCC and VCE(sat) are nearly equal
    D.
    none of the above

  14. The frequency response of an ideal tuned amplifier should be as represented in figure by

  15. A.
    A
    B.
    B
    C.
    C
    D.
    D

  16. For a good voltage amplifier, its input impedance should be

  17. A.
    low as compared to the resistance of the source
    B.
    high as compared to the resistance of the source
    C.
    always inductive
    D.
    always capacitive

  18. Gain stability in an oscillator can bs achieved by

  19. A.
    providing negative feedback
    B.
    providing positive feedback
    C.
    using low Q circuits
    D.
    controlling the gain