Special-Purpose Op-Amp Circuits 2 Questions and Answers
Operational amplifiers (Op-Amps) are the building blocks of analog electronics, and understanding special-purpose op-amp circuits is essential for students of Electronics and Communication Engineering. This resource includes special-purpose op-amp circuits questions with answers designed for GATE, BEL, and DRDO aspirants. These aptitude questions and answers with explanations cover applications such as integrators, differentiators, voltage followers, and active filters. Detailed explanations help students link theory with real-world implementation and strengthen their preparation for both academic and competitive technical exams.
Special-Purpose Op-Amp Circuits 2
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30 questions
1. The voltage gain of a basic instrumentation amplifier is set by a(n)
- diode
- capacitor.
- resistor
- inductor.
2. A basic ________ amplifier is formed by three op-amps and seven resistors.
- instrumentation
- isolation
- log
- antilog
3. Instrumentation amplifiers are normally used to measure
- small differential signal voltages.
- signals superimposed on a common-mode voltage often much larger than the signal voltage.
- both of the above
- none of the above
4. A(n) ________ amplifier is a differential voltage-gain device that amplifies the difference between the voltages existing at its two input terminals.
- instrumentation
- isolation
- operational transconductance
- log
5. The main purpose of an instrumentation amplifier is to amplify ________ signals that are riding on ________ common-mode voltages.
- small, small
- small, large
- large, small
- large, large
6. A log amplifier may use the ________ junction of a BJT in the feedback loop.
- base-collector
- base-emitter
- emitter-collector
- emitter-ground
7. A current-to-voltage converter produces a
- constant output voltage for a variable input current.
- variable output voltage for a constant input current.
- proportional output voltage for a variable input current.
- proportional output current for a variable input voltage.
8. A log amplifier has ________ in the feedback loop.
- a diode
- a BJT
- a resistor
- either a diode or a BJT
9. What is (are) the principal area(s) of application for isolation amplifiers?
- medical
- power plant
- automation
- all of the above
10. A constant-current source delivers a load current that
- remains constant when the load resistance changes
- varies with load resistance.
- varies inversely with load resistance.
- varies inversely with input voltage.