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Operational Amplifiers problems

  • 1. Input impedance [Zin(I)] of an inverting amplifier is approximately equal to:

  • Options
  • A. Ri
  • B. Rf + Ri
  • C. ?
  • D. Rf ? Ri
    • Discuss
  • 2. What is the output voltage?

    Electronics Operational Amplifiers: What is the output voltage?

  • Options
  • A. 15 V
  • B. 5 V
  • C. ?5 V
  • D. ?15 V
    • Discuss
  • 3. If ground is applied to the (+) terminal of an inverting op-amp, the (?) terminal will:

  • Options
  • A. not need an input resistor
  • B. be virtual ground
  • C. have high reverse current
  • D. not invert the signal
    • Discuss
  • 4. If a noninverting amplifier has an RIN of 1000 ohms and an RFB of 2.5 kilohms, what is the RIN voltage when 1.42 mV is applied to the correct input?

  • Options
  • A. 3.5 mV
  • B. ground
  • C. 1.42 mV
  • D. 0.56 mV
    • Discuss
  • 5. What is the difference between common-mode and differential-mode input signals?

  • Options
  • A. phase relationship
  • B. voltage
  • C. current
  • D. apparent power
    • Discuss
  • 6. If the feedback/input resistor ratio of a feedback amplifier is 4.6 with 1.7 V applied to the noninverting input, what is the output voltage value?

  • Options
  • A. 7.82 V
  • B. saturation
  • C. cutoff
  • D. 9.52 V
    • Discuss
  • 7. In an open-loop op-amp circuit, whenever the inverting input (?) is negative relative to the noninverting input (+), the output will:

  • Options
  • A. swing negative
  • B. close the loop
  • C. be balanced
  • D. swing positive
    • Discuss
  • 8. The ratio between differential gain and common-mode gain is called:

  • Options
  • A. amplitude
  • B. differential-mode rejection
  • C. common-mode rejection
  • D. phase
    • Discuss
  • 9. A circuit whose output is proportional to the difference between the input signals is considered to be which type of amplifier?

  • Options
  • A. common-mode
  • B. darlington
  • C. differential
  • D. operational
    • Discuss
  • 10. What is the output waveform of the circuit?

    Electronics Operational Amplifiers: What is the output waveform of the circuit?

  • Options
  • A. sine wave
  • B. square wave
  • C. sawtooth wave
  • D. triangle wave
    • Discuss

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