Special Purpose Op-Amp Circuits 1 Questions and Answers

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Special Purpose Operational Amplifier (Op-Amp) Circuits are widely used in filters, oscillators, and voltage regulators. These circuits are essential for analog signal processing and control applications. In GATE, ISRO, and DRDO exams, aptitude questions and answers based on Op-Amp configurations, characteristics, and applications frequently appear. Understanding the working principles of comparators, precision rectifiers, and integrators helps students solve circuit-related problems efficiently. Practice aptitude questions and answers with explanations to enhance conceptual clarity and problem-solving skills in analog electronics.

Special Purpose Op-Amp Circuits 1

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11. In an instrumentation amplifier, the first stage is typically

  • Comparator
  • Two buffers
  • Two inverting amps
  • Two integrators
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12. Instrumentation amplifiers are preferred for sensors because they offer

  • Low input impedance
  • High bias currents
  • High CMRR
  • High output impedance
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13. A comparator is used to

  • Add signals
  • Compare voltages and switch output
  • Integrate signals
  • Provide phase shift
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14. A Schmitt trigger comparator adds

  • Gain control
  • Hysteresis
  • Low-pass filtering
  • Phase lead
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15. Zero-crossing detector is a special case of

  • Integrator
  • Differentiator
  • Comparator
  • Oscillator
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16. An ideal integrators output for a DC input is

  • Constant
  • Ramp
  • Sinusoid
  • Square
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17. An ideal differentiators output for a ramp input is

  • Ramp
  • Constant
  • Parabola
  • Sinusoid
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18. Practical integrators include a resistor in parallel with the feedback capacitor to

  • Increase gain
  • Limit low-frequency gain
  • Eliminate phase shift
  • Reduce input impedance
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19. Practical differentiators include a capacitor at input and a resistor in series to

  • Limit high-frequency gain
  • Increase bandwidth
  • Remove offset
  • Reduce output swing
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20. A precision rectifier solves the issue of

  • Slew rate
  • Diode forward drop
  • Bandwidth
  • Saturation voltage
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