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ECE :: Analog Electronics

  1. Negative feedback is used in audio amplifiers to

  2. A.
    operate class C
    B.
    reduce distortion
    C.
    increase distortion
    D.
    increase gain

  3. A BJT amplifier has a power gain of 0.5 from source to base. The power gain in dB is

  4. A.
    -0.3 dB
    B.
    -3 dB
    C.
    -6 dB
    D.
    -10 dB

  5. A rectifier circuit has load resistance R. It uses a capacitance filter having capacitance C. For low ripple in the output

  6. A.
    RC should be 1
    B.
    RC should be low
    C.
    RC should be high
    D.
    RC should be neither low nor high

  7. In graphical analysis of BJT amplifier the slope of ac line is more than that of dc load line.

  8. A.
    True
    B.
    False

  9. Which circuit is called emitter follower?

  10. A.
    CC
    B.
    CE
    C.
    CB
    D.
    Both (a) and (b)

  11. Logarithmic amplifiers are used in

  12. A.
    adders
    B.
    dividers
    C.
    multipliers
    D.
    all of the above

  13. Figure represents a

  14. A.
    JFET shunt switching circuit
    B.
    JFET series switching circuit
    C.
    JFET analog switch
    D.
    multiplexing

  15. In figure VBE = 0.7 V. If base current required to saturate the transistor is 0.1 mA, Vi =

  16. A.
    5 V
    B.
    5.7 V
    C.
    10 V
    D.
    10.7 V

  17. As per miller theorem the circuit of figure (1) can be replaced by that in figure (2) If V1/V2 = K, then Y1 and Y2 are equal to

  18. A.
    Y(1 - K) each
    B.
    each
    C.
    Y1 = Y(1 - K) and Y2 =
    D.
    Y1 = and Y2 = (1 - K)

  19. In a biased JFET (Figure) the shape of the channel is as shown because

  20. A.
    it is the property of material used
    B.
    the drain end is more reverse biased than source end
    C.
    drain end is more forward biased than source end
    D.
    impurity profile changes with distance