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Digital Electronics MCQ - Multiple Choice Question and Answer

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

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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?

20
16
18
14

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