Operational Amplifiers 3 Questions and Answers
Operational Amplifiers (Op-Amps) questions with answers are a vital part of electronics aptitude tests and interviews. Topics like inverting and non-inverting amplifiers, voltage followers, and comparator circuits often appear in exams like GATE, DRDO, and ISRO. Understanding parameters such as gain, input offset voltage, and slew rate helps candidates solve circuit-based problems efficiently. This collection of Op-Amp aptitude questions with detailed explanations allows learners to strengthen analytical and conceptual understanding, preparing them for both academic and professional evaluations. Practice these Op-Amp problems to boost your preparation for electronics-based aptitude and technical interviews.
Operational Amplifiers 3
Showing 10 of
45 questions
1. For an op-amp having a slew rate SR = 5 V/ms, what is the maximum closed-loop voltage gain that can be used when the input signal varies by 0.2 V in 10 ms?
- 150
- 200
- 250
- 300
2. An op-amp has an open-loop gain of 100,000 and a cutoff frequency of 40 Hz. Find the open-loop gain at a frequency of 30 Hz.
- 800
- 8,000
- 80,000
- 100,000
3. What is the level of the voltage between the input terminals of an op-amp?
- Virtually zero
- 5 V
- 18 V
- 22 V
4. An op-amp has an open-loop gain of 75,000 and a cutoff frequency of 100 Hz. At 1 kHz the open-loop gain is down by
- 10 dB.
- 6 dB.
- 20 dB.
- 3 dB.
5. What is the difference output voltage of any signals applied to the input terminals?
- The differential gain times the difference input voltage.
- The common-mode gain times the common input voltage.
- The sum of the differential gain times the difference input voltage and the common-mode gain times the common input voltage.
- The difference of the differential gain times the difference input voltage and the common-mode gain times the common input voltage.
6. A three-stage op-amp can have a maximum phase lag of ________°.
- –180
- –90
- –270
- none of the above
8. What is the open-loop gain of an op-amp at the gain-bandwidth product of the op-amp?
- 200,000
- 50,000
- 200
- 1
9. The ________ amplifier configuration has the highest input impedance and the lowest output impedance of the three basic op-amp configurations.
- non-inverting
- inverting
- voltage-follower
- [NIL]
10. A certain op-amp has an open-loop voltage gain of 150,000. What is this gain expressed in dB?
- 51.7 dB
- 103.5 dB
- 150,000 dB
- 5.18 dB