Operational Amplifiers 3 Questions and Answers

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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

31. The midrange open-loop gain of an op-amp is 135 dB. With negative feedback this gain is reduced to 72 dB. The closed-loop gain is

  • 135 dB.
  • 72 dB.
  • 207 dB.
  • 63 dB.
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32. What is the level of the current through the amplifier input(s) to ground in an op-amp?

  • Virtually zero
  • 1.7 mA
  • 2.8 mA
  • 3.3 mA
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33. Open-loop voltage gain of an op-amp can range up to ________.

  • 10,000
  • 50,000
  • 100,000
  • 200,000
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34. At what input voltage level does the output voltage level become numerically equal to the value of the common-mode gain of the amplifier?

  • Vi1 = –Vi2 = 0.25 V
  • Vi1 = –Vi22 = 0.50 V
  • Vi1 = –Vi2 = 0.75 V
  • Vi1 = –Vi2 = 1.00 V
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35. Which of the following is (are) the result of gain reduction by a feedback?

  • The amplifier voltage gain is a more stable and precise value.
  • The input impedance of the circuit is increased over that of the op-amp alone.
  • The output impedance is reduced over that of the op-amp alone.
  • All of the above
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36. An inverting amplifier has an input impedance equal to the feedback resistor Rf.

  • TRUE
  • FALSE
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37. Closed-loop gain is the gain with negative feedback.

  • TRUE
  • FALSE
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38. Negative feedback decreases the bandwidth and increases the voltage gain.

  • TRUE
  • FALSE
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39. A good op-amp has low voltage gain, low output impedance, and high input impedance.

  • TRUE
  • FALSE
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40. A non-inverting amplifier has a higher input impedance and a lower output impedance than the op-amp itself (without feedback).

  • TRUE
  • FALSE
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