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ECE :: Analog Electronics

  1. The linear transistor circuits always operate in the

  2. A.
    saturation
    B.
    cut off
    C.
    active
    D.
    inactive

  3. In the graphical analysis of CE amplifier circuit, the intersection of base current and dc load line is called

  4. A.
    saturation point
    B.
    cut off point
    C.
    Q point
    D.
    operating point

  5. In an amplifier circuit the emitter is at ac ground potential in a

  6. A.
    CB circuit
    B.
    CC circuit
    C.
    CE circuit
    D.
    both CB and CE circuit

  7. An ideal op-amp has

  8. A.
    infinite input and output resistance
    B.
    low input and output resistance
    C.
    low input and high output resistance
    D.
    infinite input resistance and zero output resistance

  9. A class B amplifier

    1. is biased just at cutoff
    2. has a high theoretical efficiency of 78.5% because its quiescent current is low
    3. is biased at midpoint of load line
    Of the above statements

  10. A.
    2 and 3 are correct
    B.
    1 alone is correct
    C.
    1 and 2 are correct
    D.
    2 alone is correct

  11. In a practical oscillator, the magnitude of loop gain Aβ is kept slightly larger than unity and the amplitude of oscillations is limited by

  12. A.
    the ratio of A to β
    B.
    the on set of non-linearity of amplifying device
    C.
    the linearity of amplifying device
    D.
    all of the above

  13. Assertion (A): Direct coupled amplifiers are rarely used

    Reason (R): Direct coupled amplifiers suffer from the disadvantage of drift

  14. A.
    Both A and R are correct and R is correct explanation for A
    B.
    Both A and R are correct but R is not correct explanation for A
    C.
    A is correct R is wrong
    D.
    A is wrong R is correct

  15. A multistage amplifier has a low pass response with three real poles at s = - w1 - w2 and w3. The approximate overall bandwidth B of the amplifier will be given by

  16. A.
    B = w1 + w2 + w3
    B.
    C.
    B = (w1 + w2 + w3)1/3
    D.
    B = w12 + w22 + w32

  17. In a feedback series regular circuit, the output voltage is regulated by controlling the

  18. A.
    magnitude of the I/P voltage
    B.
    gain of the feed back BJT
    C.
    reference Voltage
    D.
    voltage drop across the series pass transistor

  19. The transformer cores operating at microwave frequency ranges are generally made up of

  20. A.
    silicon steel
    B.
    ferrites
    C.
    albino
    D.
    super alloy