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OP amp - section-1
  1. Hysteresis is desirable in Schmitt-trigger, because

    2. A.

     Energy is to be stored/discharged in parasitic capacitances.
    B.

     Effects of temperature would be compensated.
    C.

     Devices in the circuit should be allowed time for saturation and desaturation.
    D.

     It would prevent noise from causing false triggering.

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  2. The tail current in a differential amplifier equals .

    3. A.

     difference between two emitter currents
    B.

     sum of two emitter currents
    C.

     collector current divided by current gain
    D.

     collector voltage divided by collector resistance

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  3. An ideal OP-amp is an ideal

    4. A.

     Current controlled Current source
    B.

     Current controlled voltage source
    C.

     Voltage controlled voltage source
    D.

     voltage controlled current source

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  4. The differential voltage gain of a differential amplifier is equal to RC divided by .

    5. A.

     r'e
    B.

     r'e/2
    C.

     2r'e
    D.

     RE

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  5. How many OP-amps are required to implement this equation

    6. A.

     2
    B.

     3
    C.

     4
    D.

     1

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  6. A certain noninverting amplifier has Ri of 1 kΩ and Rf of 100 kΩ. The closed-loop voltage gain is

    7. A.

     100000
    B.

     1000
    C.

     101
    D.

     100

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  7. The node voltage at the top of the til resistor is closes to ___________

    8. A.

     collector supply voltage
    B.

     zero
    C.

     emitter supply voltage
    D.

     tail current times base resistance

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  8. A non inverting closed loop op amp circuit generally has a gain factor

    9. A.

     Less than one
    B.

     Greater than one
    C.

     Of zero
    D.

     Equal to one

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  9. The common mode voltage gain is

    10. A.

     smaller than differentail voltage gain
    B.

     equal to differential voltage gain
    C.

     greater than differential voltage gain
    D.

     none of the above

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  10. A differential amplifier ___________

    11. A.

     is a part of an Op-amp
    B.

     has one input and one output
    C.

     has two outputs
    D.

     A and B both

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