Operational Amplifiers 1 Questions and Answers
Operational Amplifiers reasoning questions with answers cover critical topics such as op-amp characteristics, applications, and frequency response. These logical reasoning questions are designed to test analytical and conceptual clarity in electronics circuits. Practicing reasoning questions for competitive exams like GATE, ISRO, and BARC builds a deep understanding of amplifier operation and troubleshooting. Strengthen your preparation with detailed solutions and explanations that help simplify complex op-amp principles for exam success.
Operational Amplifiers 1
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36 questions
21. In an open-loop op-amp circuit, whenever the inverting input (–) is negative relative to the noninverting input (+), the output will:
- swing negative
- close the loop
- be balanced
- swing positive
22. With a differential gain of 50,000 and a common-mode gain of 2, what is the common-mode rejection ratio?
- –87.9 dB
- –43.9 dB
- 43.9 dB
- 87.9 dB
23. If the input to a comparator is a sine wave, the output is a:
- ramp voltage
- sine wave
- rectangular wave
- sawtooth wave
24. What three subcircuits does a phase locked loop (PLL) consist of?
- phase comparator, comparator, and VCO
- phase comparator, bandpass filter, and VCO
- phase comparator, bandpass filter, and demodulator
- phase comparator, low-pass filter, and VCO
25. The major difference between ground and virtual ground is that virtual ground is only a:
- voltage reference
- current reference
- power reference
- difference reference
26. If an op-amp has one input grounded and the other input has a signal feed to it, then it is operating as what?
- Common-mode
- Single-ended
- Double-ended
- Noninverting mode
27. If the feedback/input resistor ratio of a feedback amplifier is 4.6 with 1.7 V applied to the noninverting input, what is the output voltage value?
- 7.82 V
- saturation
- cutoff
- 9.52 V
28. The Schmitt trigger is a two-state device that is used for:
- pulse shaping
- peak detection
- input noise rejection
- filtering
29. When a capacitor is used in place of a resistor in an op-amp network, its placement determines:
- open- or closed-loop gain
- integration or differentiation
- saturation or cutoff
- addition or subtraction