Instrumentation Amplifiers MCQs

Practice Instrumentation Amplifiers MCQs with four options, answers and explanations for focused Electronics & Telecommunication Engineering revision.

Question 1

Electronic Devices & CircuitsInstrumentation Amplifiers

In an ideal instrumentation amplifier, a key desired characteristic is?

AHigh input impedance with high common-mode rejection
BVery low input impedance at both inputs
CNo differential gain
DOperation only as an oscillator

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Correct Answer: A. High input impedance with high common-mode rejection

Explanation: Instrumentation amplifiers are designed to amplify small differential signals while loading sources minimally and rejecting large common-mode components.

Reference: Standard analog electronics: instrumentation amplifier

Question 2

Electronic Devices & CircuitsInstrumentation Amplifiers

A three-op-amp instrumentation amplifier is widely used with bridge sensors because it can amplify?

AA small differential signal riding on a common-mode voltage
BOnly a pure DC supply voltage
COnly digital logic levels
DOnly oscillator noise

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Correct Answer: A. A small differential signal riding on a common-mode voltage

Explanation: Bridge sensors often produce a small differential output superimposed on a common-mode level; an instrumentation amplifier provides gain with strong common-mode rejection.

Reference: Standard analog electronics: bridge sensor interface