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

  • A zero-level detector is a


  • Options
  • A. comparator with a sine-wave output
  • B. comparator with a trip point referenced to zero
  • C. peak detector
  • D. limiter

  • Correct Answer
  • comparator with a trip point referenced to zero 

    • Basic Op-Amp Circuits problems

    Search Results

    • 1. If the input to a comparator is a sine wave, the output is a

    • Options
    • A. ramp voltage
    • B. sine wave
    • C. rectangular wave
    • D. sawtooth wave
      • Discuss
    • 2. Initially, the closed-loop gain (Acl) of a Wien-bridge oscillator should be

    • Options
    • A. Acl < 3
    • B. Acl > 3
    • C. 0
    • D. Acl ≅ 1
      • Discuss
    • 3. A two-pole high-pass active filter would have a roll-off rate of

    • Options
    • A. 40 dB/decade
    • B. ?40 dB/decade
    • C. 20 dB/decade
    • D. ?20 dB/decade
      • Discuss
    • 4. A triangular-wave oscillator can consist of an op-amp comparator, followed by a(n)

    • Options
    • A. differentiator
    • B. amplifier
    • C. integrator
    • D. multivibrator
      • Discuss
    • 5. 

      What has the voltage across the resistor decayed to by the end of the pulse in the given circuit?


    • Options
    • A. 0 V
    • B. 0.75 V
    • C. 5.55 V
    • D. 14.25 V
      • Discuss
    • 6. The formula shows that for a given capacitor, if the voltage changes at a constant rate with respect to time, the current will

    • Options
    • A. increase
    • B. decrease
    • C. be constant
    • D. decrease logarithmically
      • Discuss
    • 7. The center frequency of a band-pass filter is always equal to the

    • Options
    • A. bandwidth
    • B. ?3 dB frequency
    • C. bandwidth divided by Q
    • D. geometric average of the critical frequencies
      • Discuss
    • 8. If the value of resistor Rf in an averaging amplifier circuit is equal to the value of one input resistor divided by the number of inputs, the output will be equal to

    • Options
    • A. the average of the individual inputs
    • B. the inverted sum of the individual inputs
    • C. the sum of the individual inputs
    • D. the inverted average of the individual inputs
      • Discuss
    • 9. A comparator is an example of a(n)

    • Options
    • A. active filter
    • B. current source
    • C. linear circuit
    • D. nonlinear circuit
      • Discuss
    • 10. A digital-to-analog converter is an application of the

    • Options
    • A. scaling adder
    • B. voltage-to-current converter
    • C. noninverting amplifier
    • D. adjustable bandwidth circuit
      • Discuss

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