# Linear Integrated Circuit Questions and Answers – Instrumentation Amplifier – 1

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This set of Linear Integrated Circuit Multiple Choice Questions & Answers (MCQs) focuses on “Instrumentation Amplifier – 1”.

1. Strain gage is an example of which device?
a) Transducer
b) Voltage follower
c) Integrator
d) Differentiator

Explanation: Strain gage is a device when subjected to pressure or force undergoes change in its resistance.

2. An instrumentation system does not include
a) Transducer
b) Instrumentation amplifier
c) Automatic process controller
d) Tester

Explanation: Except tester the remaining blocks form the input, intermediate and output stage of instrumentation system.

3. Transmission line are used for
a) Output signal
b) Input signal
c) Signal transfer
d) All of the mentioned

Explanation: Transmission lines are the connecting line between the blocks and permits signal transfer from unit to unit.

4. The length of the transmission lines are
a) Longer than 10 meters
b) Shorter than 10 meters
c) Equals to 10 meters
d) None of the mentioned

Explanation: The length of the transmission lines depends primarily on the physical quantities being monitored and on system requirement.

5. Why output of transducer is not directly connected to indicator or display?
a) Low level output is produced
b) High level output is produced
c) No output is produced
d) Input is fed directly

Explanation: Many transducers do not produce output with sufficient strength to permit there use directly. Therefore, the low level output signal of transducer need to be amplified.

6. What are the features of instrumentation amplifier?
a) Low noise
b) High gain accuracy
c) Low thermal and time drift
d) All of the mentioned

Explanation: Instrumentation amplifiers are intended for precise low level signal amplification because of the features mentioned.

7. What is the disadvantage of using LH0036 instrumentation op-amp?
a) Extremely stable
b) Relatively expensive
c) Accurate
d) All of the mentioned

Explanation: LH0036 is a very precise special purpose circuit in which most electrical parameters are minimized and performance is optimized. So, it is relatively expensive.

8. What instrument is used to amplify output signal of transducer
a) Peaking amplifier
b) Instrumentation amplifier
c) Differential amplifier
d) Bridge amplifier

Explanation: The major function of instrumentation amplifier is to amplify the low level output signal of the transducer, so that it can drive the output stages.

9. General purpose op-amps are used in applications as
a) Instrumentation amplifier
b) Differential instrumentation amplifier
c) Inverting instrumentation amplifier
d) Non-inverting instrumentation amplifier

Explanation: When the requirement for the application are not too strict. The general purpose op-amp can be employed in the differential mode. Such amplifiers are called as Differential instrumentation amplifier.

10. In an instrumentation amplifier using transducer bridge, which device measure the change in physical energy
a) Resistive transducer
b) Indicating meter
c) Capacitive transducer
d) Inductor circuit

Explanation: A resistive transducer is used to measure the change in same physical energy, which is connected to one arm of the bridge.

Sanfoundry Global Education & Learning Series – Linear Integrated Circuits.

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