Differential amplifiers are used in______________?

Related Mcqs:

1. A differential amplifier has a differential gain of 20,000. CMMR=80dB. The common mode gain is given by_______________?

   A. 2
   B. 1
   C. 1/2
   D. 0

2. 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

3. A differential amplifier is invariably used in the i/p stage of all op-amps. This is done basically to provide the op-amps with a very high______________?

   A. CMMR
   B. Bandwidth
   C. Slew rate
   D. Open-loop gain

4. For an op-amp having differential gain Av and common-mode gain Ac the CMRR is given by___________?

   A. Av + Ac
   B. Av / Ac
   C. 1 + Av / AC.
   D. Ac / Av

5. The ideal OP-AMP has the following characteristics

   A. Ri=∞ ,A=∞ ,R0=0
   B. Ri=0 ,A=∞ ,R0=0
   C. Ri=∞ ,A=∞ ,R0=∞
   D. Ri=0 ,A=∞ ,R0=∞

6. 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

7. 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

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

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

9. 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

10. 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