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EEE :: OP amp

  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.


  3. The tail current in a differential amplifier equals .

  4. 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


  5. An ideal OP-amp is an ideal

  6. A.

     Current controlled Current source

    B.

     Current controlled voltage source

    C.

     Voltage controlled voltage source

    D.

     voltage controlled current source


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

  8. A.

     r'e

    B.

     r'e/2

    C.

     2r'e

    D.

     RE


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

  10. A.

     2

    B.

     3

    C.

     4

    D.

     1


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

  12. A.

     100000

    B.

     1000

    C.

     101

    D.

     100


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

  14. A.

     collector supply voltage

    B.

     zero

    C.

     emitter supply voltage

    D.

     tail current times base resistance


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

  16. A.

     Less than one

    B.

     Greater than one

    C.

     Of zero

    D.

     Equal to one


  17. The common mode voltage gain is

  18. A.

     smaller than differentail voltage gain

    B.

     equal to differential voltage gain

    C.

     greater than differential voltage gain

    D.

     none of the above


  19. A differential amplifier ___________

  20. A.

     is a part of an Op-amp

    B.

     has one input and one output

    C.

     has two outputs

    D.

     A and B both