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Operational Amplifiers problems

  • 1. The voltage follower has a:

  • Options
  • A. closed-loop voltage gain of unity
  • B. small open-loop voltage gain
  • C. closed-loop bandwidth of zero
  • D. large closed-loop output impedance
    • Discuss
  • 2. The major difference between ground and virtual ground is that virtual ground is only a:

  • Options
  • A. voltage reference
  • B. current reference
  • C. power reference
  • D. difference reference
    • Discuss
  • 3. A differential amplifier has a common-mode gain of 0.2 and a common-mode rejection ratio of 3250. What would the output voltage be if the single-ended input voltage was 7 mV rms?

  • Options
  • A. 1.4 mV rms
  • B. 650 mV rms
  • C. 4.55 V rms
  • D. 0.455 V rms
    • Discuss
  • 4. Electronics Operational Amplifiers: Decreasing the g

    Decreasing the gain in the given circuit could be achieved by


  • Options
  • A. reducing the amplitude of the input voltage
  • B. increasing the value of the feedback resistor
  • C. increasing the value of the input resistor
  • D. removing the feedback resistor
    • Discuss
  • 5. The input offset current equals the

  • Options
  • A. average of two base currents
  • B. collector current divided by the current gain
  • C. difference between two base-emitter voltages
  • D. difference between two base currents
    • Discuss
  • 6. With negative feedback, the returning signal

  • Options
  • A. is proportional to the output current
  • B. is proportional to the differential voltage gain
  • C. opposes the input signal
  • D. aids the input signal
    • Discuss
  • 7. What is this circuit?

    Electronics Operational Amplifiers: What is this circuit?

  • Options
  • A. a low-pass filter
  • B. a high-pass filter
  • C. a bandpass filter
  • D. a band-stop filter
    • Discuss
  • 8. What is the frequency of this 555 astable multivibrator?

    Electronics Operational Amplifiers: What is the frequency of this 555 astable multivibrator?

  • Options
  • A. 278 Hz
  • B. 178 Hz
  • C. 78 Hz
  • D. 8 Hz
    • Discuss
  • 9. If the gain of a closed-loop inverting amplifier is 3.9, with an input resistor value of 1.6 kilohms, what value of feedback resistor is necessary?

  • Options
  • A. 6240 ohms
  • B. 2.4 kilohms
  • C. 410 ohms
  • D. 0.62 kilohms
    • Discuss
  • 10. When a capacitor is used in place of a resistor in an op-amp network, its placement determines:

  • Options
  • A. open- or closed-loop gain
  • B. integration or differentiation
  • C. saturation or cutoff
  • D. addition or subtraction
    • Discuss

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