Special Purpose Op-Amp Circuits 1 Questions and Answers

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Q1
Isolation amps are named as such because they are sealed for protection from outside environmental damage.
  • A TRUE
  • B FALSE
Answer: Option B
Q2
To construct an instrumentation amplifier, two op-amps and seven resistors are needed.
  • A TRUE
  • B FALSE
Answer: Option B
Q3
Clampers are often called peak detectors.
  • A TRUE
  • B FALSE
Answer: Option B
Q4
An OTA is primarily a current-to-voltage amplifier.
  • A TRUE
  • B FALSE
Answer: Option B
Q5
In a voltage follower, the voltage gain is approximately
  • A 0
  • B 1
  • C 10
  • D Infinite
Answer: Option B
Explanation: A voltage follower (buffer) has unity gain with very high input impedance and low output impedance.
Q6
The main purpose of a voltage follower is to
  • A Amplify voltage
  • B Provide impedance matching
  • C Invert the signal
  • D Filter high frequency noise
Answer: Option B
Explanation: Voltage followers isolate a high-impedance source from a low-impedance load without changing the voltage level.
Q7
An inverting summing amplifier sums inputs with
  • A Positive weights
  • B Negative weights
  • C Unity weights only
  • D Random weights
Answer: Option B
Explanation: The inverting configuration introduces a 180 degrees phase shift, giving negative weighted summation.
Q8
A non-inverting summing amplifier output is a
  • A Negative weighted sum
  • B Positive weighted sum
  • C Product of inputs
  • D Difference of inputs
Answer: Option B
Explanation: Non-inverting adders provide positive-weighted summation based on resistor ratios.
Q9
A differential amplifier outputs
  • A Sum of two inputs
  • B Difference of two inputs
  • C Product of two inputs
  • D Average of two inputs
Answer: Option B
Explanation: Differential amplifiers amplify the difference while rejecting common-mode components.
Q10
The ideal common-mode rejection ratio (CMRR) of a differential amplifier is
  • A 0
  • B 1
  • C Very high
  • D Very low
Answer: Option C
Explanation: High CMRR allows rejecting common-mode noise and interference effectively.

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