Extra exam question E7G12
Subelement E7, PRACTICAL CIRCUITS· Group E7G
What is an operational amplifier?
- A.A high-gain, direct-coupled differential amplifier with very high input impedance and very low output impedance (correct answer)
- B.A digital audio amplifier whose characteristics are determined by components external to the amplifier
- C.An amplifier used to increase the average output of frequency modulated amateur signals to the legal limit
- D.A RF amplifier used in the UHF and microwave regions
WhyAn operational amplifier is a high-gain, direct-coupled differential amplifier with very high input impedance and very low output impedance. An operational amplifier is a high-gain, direct-coupled differential amplifier with very high input impedance and very low output impedance, a general-purpose building block whose actual behavior in a circuit is shaped almost entirely by the external feedback components connected around it, answer A. It isn't specifically a digital audio amplifier, isn't built for boosting FM signal output to the legal power limit, and isn't a dedicated UHF/microwave RF amplifier, op-amps are a much more general, versatile building block than any of those narrower descriptions.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2024-2028 NCVEC Element 4 pool (public domain); the explanation above is original writing, see our methodology.
Related questions
- E7G01What is the typical output impedance of an op-amp?
- E7G02What is the frequency response of the circuit in E7-3 if a capacitor is added across the feedback resistor?
- E7G03What is the typical input impedance of an op-amp?
- E7G04What is meant by the term “op-amp input offset voltage”?
- E7G05How can unwanted ringing and audio instability be prevented in an op-amp audio filter?