The approximate input impedance of the opamp circuit which has Ri=10k, Rf=100k, RL=10k?

Related Mcqs:

1. An amplifier using an opamp with slew rate SR=1v/sec has a gain of 40db.If this amplifier has to faithfully amplify sinusoidal signals from dc to 20KHz without introducing any slew-rate induced distortion, then the input signal level exceed_____________?

   A. 795mV
   B. 395mV
   C. 795mV
   D. 39.5mV

2. The two input terminals of an opamp are labeled as______________?

   A. High and low
   B. Positive and negative
   C. Inverting and non inverting
   D. Differential ans non differential

3. An opamp has a slew rate of 5V/ S. the largest sine wave o/p voltage possible at a frequency of 1MHz is____________?

   A. 10 V
   B. 5 V
   C. 5V
   D. 5/2 V

4. A 741-Type OP-AMP has a gain-bandwith product of 1MHz. A non-inverting amplifier using this opamp & having a voltage gain of 20db will exhibit -3db bandwidth of______________?

   A. 50KHz
   B. 100KHz
   C. 1000/17KHz
   D. 1000/7.07KHz

5. An OPAMP has a slew rate of 5 V/μ S .The largest sine wave O/P voltage possible at a frequency of 1 MHZ is_______________?

   A. 10 volts
   B. 5 volts
   C. 5/ volts
   D. 5/2 volts

6. When a step-input is given to an op-amp integrator, the output will be______________?

   A. A ramp
   B. A sinusoidal wave
   C. A rectangular wave
   D. A triangular wave with dc bias

7. A non inverting closed loop op amp circuit generally has a gain factor______________?

   A. Less than one
   B. Greater than one
   C. Of zero
   D. Equal to one

8. In the above circuit the current ix is___________?

   A. 0.6A
   B. 0.5A
   C. 0.2A
   D. 1/12A

9. The output voltage Vo of the above circuit is____________?

   A. -6V
   B. -5V
   C. -1.2V
   D. -0.2V

10. 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________________?

    A. 23dB
    B. 25dB
    C. 46dB
    D. 50dB