# Basic Op-Amp Circuits MCQ Questions & Answers

Basic Op-Amp Circuits MCQs : This section focuses on the "Basic Op-Amp Circuits". These Multiple Choice Questions (MCQs) should be practiced to improve the Basic Op-Amp Circuits skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.

Question 1

If the value of resistor Rf in an averaging amplifier circuit is equal to the value of one input resistor divided by the number of inputs, the output will be equal to

A. the average of the individual inputs
B. the inverted sum of the individual inputs
C. the sum of the individual inputs
D. the inverted average of the individual inputs

Question 2

The center frequency of a band-pass filter is always equal to the

A. bandwidth
B. –3 dB frequency
C. bandwidth divided by Q
D. geometric average of the critical frequencies

Question 3

If the input to a comparator is a sine wave, the output is a

A. ramp voltage
B. sine wave
C. rectangular wave
D. sawtooth wave

Question 4

The ramp voltage at the output of an op-amp integrator

A. increases or decreases at a linear rate
B. increases or decreases exponentially
C. is always increasing and never decreasing
D. is constant

Question 5

Initially, the closed-loop gain (Acl) of a Wien-bridge oscillator should be

A. Acl < 3
B. Acl > 3
C. 0
D. Acl 1

Question 6

In an averaging amplifier, the input resistances are

A. equal to the feedback resistance
B. less than the feedback resistance
C. greater than the feedback resistance
D. unequal

Question 7

A triangular-wave oscillator can consist of an op-amp comparator, followed by a(n)

A. differentiator
B. amplifier
C. integrator
D. multivibrator

Question 8

A two-pole high-pass active filter would have a roll-off rate of

Question 9

A comparator is an example of a(n)

A. active filter
B. current source
C. linear circuit
D. nonlinear circuit

Question 10

A basic series regulator has

A. an error detector
C. a reference voltage
D. both an error detector and a reference voltage

Question 11

A zero-level detector is a

A. comparator with a sine-wave output
B. comparator with a trip point referenced to zero
C. peak detector
D. limiter