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  • Question

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


  • Options
  • A. Ri
  • B. Rf + Ri
  • C. ?
  • D. Rf ? Ri

  • Correct Answer
  • Ri 

    • Operational Amplifiers problems

    Search Results

    • 1. What is the output waveform?


    • Options
    • A. sine wave
    • B. square wave
    • C. sawtooth wave
    • D. triangle wave
      • Discuss
    • 2. A circuit that uses an amplifier with passive filter elements is called a(n):

    • Options
    • A. relaxation oscillator
    • B. signal generator
    • C. differential amplifier
    • D. active filter
      • Discuss
    • 3. How many leads does the TO-5 metal can package of an operational amplifier have?

    • Options
    • A. 8, 10, or 12
    • B. 6, 8, or 10
    • C. 8 or 14
    • D. 8 or 16
      • Discuss
    • 4. What is the cutoff frequency of this low-pass filter?


    • Options
    • A. 4.8 kHz
    • B. 3.8 kHz
    • C. 2.8 kHz
    • D. 1.8 kHz
      • Discuss
    • 5. With a differential gain of 50,000 and a common-mode gain of 2, what is the common-mode rejection ratio?

    • Options
    • A. ?87.9 dB
    • B. ?43.9 dB
    • C. 43.9 dB
    • D. 87.9 dB
      • Discuss
    • 6. What is the output voltage?


    • Options
    • A. 15 V
    • B. 5 V
    • C. ?5 V
    • D. ?15 V
      • Discuss
    • 7. 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
    • 8. 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
    • 9. What is the difference between common-mode and differential-mode input signals?

    • Options
    • A. phase relationship
    • B. voltage
    • C. current
    • D. apparent power
      • Discuss
    • 10. 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

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