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...