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  • Question

  • What is the difference between common-mode and differential-mode input signals?


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

  • Correct Answer
  • phase relationship 

    • Operational Amplifiers problems

    Search Results

    • 1. 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
    • 2. 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
    • 3. What is the output voltage?


    • Options
    • A. 15 V
    • B. 5 V
    • C. ?5 V
    • D. ?15 V
      • Discuss
    • 4. Input impedance [Zin(I)] of an inverting amplifier is approximately equal to:

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


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


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

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