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OP amp - section-1
  1. A differential amplifier is invariably used in the i/p stage of all OP-amps. This is done basically to provide the OP-amps with a very high

    2. A.

     CMMR
    B.

     Bandwidth
    C.

     Slew rate
    D.

     Open-loop gain

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  2. With zero volts on both inputs, an OP-amp ideally should have an output ___________

    3. A.

     equal to the positive supply voltage
    B.

     equal to the negative supply voltage
    C.

     equal to zero
    D.

     equal to CMRR

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  3. The tail current of a differential amplifier is .

    4. A.

     half of either collector current
    B.

     equal to either collector current
    C.

     two times either collector current
    D.

     equal to the difference in base currents

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  4. A differential amplifier has a differential gain of 20,000. CMRR=80dB. The common mode gain is given by

    5. A.

     2
    B.

     1
    C.

     1/2
    D.

     0

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  5. The use of negative feedback

    6. A.

     reduces the voltage gain of an Op-amp
    B.

     makes the Op-amp oscillate
    C.

     makes linear operation possible
    D.

     A and B both

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  6. In the common mode, ___________

    7. A.

     both inputs are grounded
    B.

     the outputs are connected together
    C.

     an identical signal appears on both the inputs
    D.

     the output signal are in-phase

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  7. The two input terminals of an opamp are labeled as

    8. A.

     High and low
    B.

     Positive and negative
    C.

     Inverting and non inverting
    D.

     Differential ans non differential

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  8. OP-amp circuits may be cascaded without changing their input output relationships

    9. A.

     True
    B.

     False

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  9. A common mode signal is applied to ___________

    10. A.

     the noninverting input
    B.

     the inverting input
    C.

     both iputs
    D.

     top of the tail resistor

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  10. Differential amplifiers are used in

    11. A.

     Instrumentation amplifiers
    B.

     Voltage followers
    C.

     Voltage regulators
    D.

     Buffers

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