Digital Electronics MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Digital Electronics, a fundamental topic in the field of Electronics and Communication Engineering. Whether you're preparing for competitive exams, honing your problem-solving skills, or simply looking to enhance your abilities in this field, our Digital Electronics MCQs are designed to help you grasp the core concepts and excel in solving problems.

In this section, you'll find a wide range of Digital Electronics mcq questions that explore various aspects of Digital Electronics problems. Each MCQ is crafted to challenge your understanding of Digital Electronics principles, enabling you to refine your problem-solving techniques. Whether you're a student aiming to ace Electronics and Communication Engineering tests, a job seeker preparing for interviews, or someone simply interested in sharpening their skills, our Digital Electronics MCQs are your pathway to success in mastering this essential Electronics and Communication Engineering topic.

Note: Each of the following question comes with multiple answer choices. Select the most appropriate option and test your understanding of Digital Electronics. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

So, are you ready to put your Digital Electronics knowledge to the test? Let's get started with our carefully curated MCQs!

Digital Electronics MCQs | Page 22 of 117

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Q211.
Out of S, R, J, K, Preset, Clear inputs to flip flops, the synchronous inputs are

a.

S, R, J, K only

b.

S, R, Preset, Clear only

c.

Preset, Clear only

d.

S, R only

Discuss
Answer: (a).S, R, J, K only
Q212.
Assertion (A): A demultiplexer can be used as a decoder.

Reason (R): A demultiplexer can be built by using AND gates only.

a.

Both A and R are correct and R is correct explanation of A

b.

Both A and R are correct but R is not correct explanation of A

c.

A is true, R is false

d.

A is false, R is true

Discuss
Answer: (c).A is true, R is false
Q213.
Assertion (A): The output of a NOR gate is equal to the complement of OR of input variables.

Reason (R): A XOR gate is a universal gate.

a.

Both A and R are correct and R is correct explanation of A

b.

Both A and R are correct but R is not correct explanation of A

c.

A is true, R is false

d.

A is false, R is true

Discuss
Answer: (c).A is true, R is false
Q214.
The number of bits in ASCII is

a.

12

b.

10

c.

9

d.

7

Discuss
Answer: (d).7
Q215.
4 bit 2's complement representation of a decimal number is 1000. The number is

a.

+ 8

b.

0

c.

- 7

d.

- 8

Discuss
Answer: (d).- 8
Q216.
In a D latch

a.

data bit D is fed to S input and D to R input

b.

data bit D is fed to R input and D to S input

c.

data bit D is fed to both R and S inputs

d.

data bit D is not fed to any input

Discuss
Answer: (a).data bit D is fed to S input and D to R input
Q217.
A 4 : 1 multiplexer requires __________ data select line.

a.

1

b.

2

c.

3

d.

4

Discuss
Answer: (b).2
Q218.
The number of unused states in a 4 bit Johnson counter is

a.

2

b.

4

c.

8

d.

12

Discuss
Answer: (c).8
Q219.
It is desired to display the digit 7 using a seven segment display. The LEDs to be turned on are

a.

a, b, c

b.

b, c, d

c.

c, d, e

d.

a, b, d

Discuss
Answer: (a).a, b, c
Q220.
For a MOD-12 counter, the FF has a tpd = 60 ns The NAND gate has a tpd of 25 n sec. The clock frequency is

a.

3.774 MHz

b.

> 3.774 MHz

c.

< 3.774 MHz

d.

4.167 MHz

Discuss
Answer: (a).3.774 MHz
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