Digital Electronics MCQ Question with Answer

Digital Electronics MCQ with detailed explanation for interview, entrance and competitive exams. Explanation are given for understanding.

Question No : 15
What is the Boolean expression for a three-input AND gate?

X = A + B + C

X = A � B � C

x=
A � B � C

x=A B

Question No : 16
How many pins does the 4049 IC have?

Question No : 17
The Boolean expression for a 3-input AND gate is ________.

X = ABC

X = AB

X = A + B + C

X = AB + C

Question No : 18
What is a digital-to-analog converter?

It stores digital data on a hard drive.

It converts direct current to alternating current.

It takes the digital information from an audio CD and converts it to a usable form.

It allows the use of cheaper analog techniques, which are always simpler.

Question No : 19
When used with an IC, what does the term "QUAD" indicate?

2 circuits

4 circuits

6 circuits

8 circuits

Question No : 20
The output of an AND gate is LOW ________.

when any input is LOW

when all inputs are HIGH

when any input is HIGH

all the time

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