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EEE :: OP amp

  1. In differential-mode, ___________

  2. A.

     opposite polarity signals are applied to the inputs

    B.

     the gain is one

    C.

     the outputs are of different amplitudes

    D.

     only one supply voltage is used


  3. Assume that the OP-amp of the fig. is ideal. If Vi is a triangular wave, then V0 will be

  4. A.

     Square wave

    B.

     Triangular wave

    C.

     Parabolic wave

    D.

     Sine wave


  5. The differential gain is

  6. A.

     very high

    B.

     very low

    C.

     dependent on input voltage

    D.

     about 100


  7. When a number of stages are connected in parallel, the overall gain is the product of the individual stage gains

  8. A.

     True

    B.

     False


  9. For an ideal OP-amp, which of the following is true?

  10. A.

     The differential voltage across the input terminals is zero

    B.

     The current into the input terminals is zero

    C.

     The current from output terminal is zero

    D.

     The output resistance is zero


  11. The OP-amp can amplify

  12. A.

     c. signals only

    B.

     d.c. signals only

    C.

     both a.'and d.'signals

    D.

     neither 'c. nor a.c. signals


  13. In the differential voltage gain & the common mode voltage gain of a differential amplifier are 48db & 2db respectively, then its common mode rejection ratio is

  14. A.

     23dB

    B.

     25dB

    C.

     46dB

    D.

     50dB


  15. When a differential amplifier is operated single-ended, ___________

  16. A.

     the output is grounded

    B.

     one input is grounded and signal is applied to the other

    C.

     both inputs are connected together

    D.

     the output is not inverted


  17. Negative feedback ___________

  18. A.

     increases the input and output impedances

    B.

     increases the input impedance and bandwidth

    C.

     decreases the output impedance and bandwidth

    D.

     does not affect impedance or bandwidth


  19. A voltage follower ___________

  20. A.

     has a voltage gain of 1

    B.

     is noninverting

    C.

     has no feedback resistor

    D.

     has all of these