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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

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  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

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  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

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  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

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  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

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  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

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  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

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  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

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  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

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  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

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