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  • Question

  • 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

  • Correct Answer
  • closed-loop voltage gain of unity 

    • Operational Amplifiers problems

    Search Results

    • 1. 

      What is the resonant frequency in the given circuit?


    • Options
    • A. 11.6 Hz
    • B. 275.8 Hz
    • C. 1.5 kHz
    • D. 3.2 kHz
      • Discuss
    • 2. What is the phase angle?


    • Options
    • A. 61.4º
    • B. 28.5º
    • C. -28.5º
    • D. -61.4º
      • Discuss
    • 3. In a series RLC circuit the current can be found using:

    • Options
    • A.
    • B.
    • C. both of the above
    • D. none of the above
      • Discuss
    • 4. What is the Q (Quality factor) of a series circuit that resonates at 6 kHz, has equal reactance of 4 kilo-ohms each, and a resistor value of 50 ohms?

    • Options
    • A. 0.001
    • B. 50
    • C. 80
    • D. 4.0
      • Discuss
    • 5. At any resonant frequency, what net voltage is measured across the two series reactive components?

    • Options
    • A. Applied voltage
    • B. Reactive voltage
    • C. Zero voltage
    • D. VL + VC voltage
      • Discuss
    • 6. 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
    • 7. 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
    • 8. 

      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
    • 9. 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
    • 10. 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

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