Special Purpose Op-Amp Circuits 1 Questions and Answers

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Q51
A difference amplifiers exact common-mode rejection depends on
  • A Op-amp slew rate
  • B Resistor matching
  • C Capacitor ESR
  • D Supply ripple
Answer: Option B
Explanation: Precise ratio matching of resistor pairs ensures high CMRR.
Q52
An active notch filter can be built by combining
  • A Two low-pass only
  • B Low-pass and high-pass in parallel
  • C Two high-pass only
  • D Two band-pass in series
Answer: Option B
Explanation: Parallel LP and HP with summing can cancel a narrow frequency band.
Q53
For a Wien-bridge oscillator, amplitude stabilization often uses
  • A Inductor
  • B Lamp or diodes in feedback
  • C Transformer
  • D Varactor
Answer: Option B
Explanation: A small lamp or back-to-back diodes provide automatic gain control to reduce distortion.
Q54
In a relaxation oscillator using an op-amp, the integrating component is
  • A Inductor
  • B Capacitor
  • C Transformer
  • D Varistor
Answer: Option B
Explanation: The capacitor charges and discharges between thresholds set by the Schmitt trigger.
Q55
A summing amplifier can implement a
  • A Weighted DAC
  • B ADC
  • C PLL
  • D Mixer only
Answer: Option A
Explanation: Weighted resistors with a summing node can implement a simple DAC.
Q56
A differentiator emphasizes
  • A Low frequencies
  • B Mid frequencies
  • C High-frequency changes
  • D DC levels
Answer: Option C
Explanation: Differentiation responds strongly to rapid changes, boosting high-frequency components.
Q57
Active filters with op-amps are preferred over passive RC for low frequencies because they provide
  • A No gain
  • B Gain and low output impedance
  • C Only high Q
  • D Only high power handling
Answer: Option B
Explanation: Active filters can amplify and buffer, improving performance at low frequencies.
Q58
The slew rate of an op-amp limits a waveform generators
  • A DC offset
  • B Maximum output frequency and amplitude
  • C Input impedance
  • D Output resistance
Answer: Option B
Explanation: Insufficient slew rate causes distortion at high frequency or large amplitude swings.
Q59
A precision rectifier followed by an RC forms a
  • A RMS converter
  • B Envelope detector
  • C Frequency doubler
  • D Band-stop filter
Answer: Option B
Explanation: Rectifying and smoothing capture the signals amplitude envelope.

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