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Home ‣ Electronics ‣ Basic Op-Amp Circuits Comments
  • Question

  • For a Wien-bridge oscillator to produce a sustained sine-wave output, the phase shift around the positive feedback loop must be greater than 0°.


  • Options
  • A. True
  • B. False

  • Correct Answer
  • False 

    • Basic Op-Amp Circuits problems

    Search Results

    • 1. The effectiveness of a filter in rejecting signals beyond cutoff frequency is a function of the filter roll-off rating.

    • Options
    • A. True
    • B. False
      • Discuss
    • 2. The output voltage of a summing amplifier is proportional to the product of the input voltages.

    • Options
    • A. True
    • B. False
      • Discuss
    • 3. To operate properly, an oscillator requires an external ac input signal.

    • Options
    • A. True
    • B. False
      • Discuss
    • 4. When used as a comparator, an op-amp is wired in a closed-loop configuration.

    • Options
    • A. True
    • B. False
      • Discuss
    • 5. A zero-level detector is a type of comparator circuit.

    • Options
    • A. True
    • B. False
      • Discuss
    • 6. A two-pole active filter produces a roll-off rate of ?20 dB/decade.

    • Options
    • A. True
    • B. False
      • Discuss
    • 7. The control element in a basic shunt voltage regulator is a zener diode.

    • Options
    • A. True
    • B. False
      • Discuss
    • 8. A Wien-bridge oscillator uses _________.

    • Options
    • A. positive feedback
    • B. negative feedback
    • C. both types of feedback
    • D. an LC tank circuit
      • Discuss
    • 9. In order to sustain oscillations in a feedback oscillator, the gain should be _________ so the Acl _______.

    • Options
    • A. reduced, equals one
    • B. reduced, is less than one
    • C. increased, is more than one
    • D. increased, is much greater than one
      • Discuss
    • 10. 

      The reference voltage for the comparator in the given circuit equals ______.


    • Options
    • A. 0 V
    • B. +8.8 V
    • C. +16 V
    • D. +7.2 V
      • Discuss

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