Operational Amplifiers MCQs

Question 1

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

Accepted Answer

rectangular wave

Answer

ramp voltage

Answer

sine wave

Answer

sawtooth wave

Question 2

What three subcircuits does a phase locked loop (PLL) consist of?

Accepted Answer

phase comparator, low-pass filter, and VCO

Answer

phase comparator, comparator, and VCO

Answer

phase comparator, bandpass filter, and VCO

Answer

phase comparator, bandpass filter, and demodulator

Question 3

If the feedback/input resistor ratio of a feedback amplifier is 4.6 with 1.7 V applied to the noninverting input, what is the output voltage value?

Accepted Answer

9.52 V

Answer

7.82 V

Answer

saturation

Answer

cutoff

Question 4

The major difference between ground and virtual ground is that virtual ground is only a:

Accepted Answer

voltage reference

Answer

current reference

Answer

power reference

Answer

difference reference

Question 5

If an op-amp has one input grounded and the other input has a signal feed to it, then it is operating as what?

Accepted Answer

Single-ended

Answer

Common-mode

Answer

Double-ended

Answer

Noninverting mode

Question 6

An output that is proportional to the addition of two or more inputs is from which type of amplifier?

Accepted Answer

summing

Answer

differentiator

Answer

difference

Answer

analog subtractor

Question 7

The common-mode voltage gain is

Accepted Answer

smaller than differential voltage gain

Answer

equal to voltage gain

Answer

greater than differential voltage gain

Answer

None of the above

Question 8

How many logic states does an S-R flip-flop have?

Accepted Answer

4

Answer

2

Answer

3

Answer

5

Question 9

The Schmitt trigger is a two-state device that is used for:

Accepted Answer

pulse shaping

Answer

peak detection

Answer

input noise rejection

Answer

filtering