Basic Op-Amp Circuits problems
- 1. 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
Correct Answer: integrator
- 2. 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
Correct Answer: ?40 dB/decade
- 3. 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
Correct Answer: Acl > 3
- 4. 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
Correct Answer: rectangular wave
- 5. 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 Discuss
Correct Answer: comparator with a trip point referenced to zero
- 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
Correct Answer: be constant
- 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
Correct Answer: geometric average of the critical frequencies
- 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
Correct Answer: the inverted average of the individual inputs
- 9. A comparator is an example of a(n)
Options- A. active filter
- B. current source
- C. linear circuit
- D. nonlinear circuit Discuss
Correct Answer: nonlinear circuit
- 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
Correct Answer: scaling adder
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