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OP amp - section-1
  1. The input stage of an OP-amp is usually a ___________

    2. A.

     differential amplifier
    B.

     class B push-pull amplifier
    C.

     CE amplifier
    D.

     swamped amplifier

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  2. A certain OP-amp has bias currents of 50 µA. The input offset current is

    3. A.

     700 nA
    B.

     99.3 µA
    C.

     49.7 µA
    D.

     none of these

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  3. The output voltage Vo of the above circuit is

    4. A.

     -6V
    B.

     -5V
    C.

     -1.2V
    D.

     -0.2V

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  4. For an OP-amp having differential gain Av and common mode gain Ac the CMRR is given by

    5. A.

     Av + Ac
    B.

     Av / Ac
    C.

     1 + (Av / Ac)
    D.

     Ac / Av

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  5. Which of the following amplifier is used in a digital to analog converter?

    6. A.

     Non inverter
    B.

     Voltage follower
    C.

     Summer
    D.

     Difference amplifier

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  6. The input offset current equals the ___________

    7. A.

     difference between two base currents
    B.

     average of two base currents
    C.

     collector current divided by current gain
    D.

     none of these

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