Special Purpose Op-Amp Circuits 1 Questions and Answers

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Q11
In an instrumentation amplifier, the first stage is typically
  • A Comparator
  • B Two buffers
  • C Two inverting amps
  • D Two integrators
Answer: Option B
Explanation: The first stage uses two non-inverting buffers with a gain set by a single resistor for high input impedance.
Q12
Instrumentation amplifiers are preferred for sensors because they offer
  • A Low input impedance
  • B High bias currents
  • C High CMRR
  • D High output impedance
Answer: Option C
Explanation: High CMRR and high input impedance make them ideal for low-level sensor signals.
Q13
A comparator is used to
  • A Add signals
  • B Compare voltages and switch output
  • C Integrate signals
  • D Provide phase shift
Answer: Option B
Explanation: Comparators output a logic-level high/low depending on which input is greater.
Q14
A Schmitt trigger comparator adds
  • A Gain control
  • B Hysteresis
  • C Low-pass filtering
  • D Phase lead
Answer: Option B
Explanation: Hysteresis prevents rapid switching due to noise near the threshold.
Q15
Zero-crossing detector is a special case of
  • A Integrator
  • B Differentiator
  • C Comparator
  • D Oscillator
Answer: Option C
Explanation: It compares the input to 0 V and changes output sign at zero crossings.
Q16
An ideal integrators output for a DC input is
  • A Constant
  • B Ramp
  • C Sinusoid
  • D Square
Answer: Option B
Explanation: Integration of a constant produces a linearly increasing or decreasing ramp.
Q17
An ideal differentiators output for a ramp input is
  • A Ramp
  • B Constant
  • C Parabola
  • D Sinusoid
Answer: Option B
Explanation: Differentiation of a ramp (constant slope) yields a constant output.
Q18
Practical integrators include a resistor in parallel with the feedback capacitor to
  • A Increase gain
  • B Limit low-frequency gain
  • C Eliminate phase shift
  • D Reduce input impedance
Answer: Option B
Explanation: The resistor prevents excessive DC gain and drift.
Q19
Practical differentiators include a capacitor at input and a resistor in series to
  • A Limit high-frequency gain
  • B Increase bandwidth
  • C Remove offset
  • D Reduce output swing
Answer: Option A
Explanation: Limiting high-frequency gain stabilizes against noise and oscillations.
Q20
A precision rectifier solves the issue of
  • A Slew rate
  • B Diode forward drop
  • C Bandwidth
  • D Saturation voltage
Answer: Option B
Explanation: Op-amp assisted rectifiers overcome diode threshold, enabling accurate low-level rectification.

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