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 85 of 117

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Q841.
The logic operation that will selectively clear bits in register A in those positions where these are 1 's in the bits of register B is given by

a.

A โ† A + B

b.

A โ† Aฬ…B

c.

A โ† Aฬ… + B

d.

A โ† AB

Discuss
Answer: (d).A โ† AB
Q842.
The 2's complement representation of the decimal number -4 is

a.

0100

b.

1100

c.

1011

d.

1010

Discuss
Answer: (b).1100
Q843.
The following program starts at location 0100H

L X ISP, 00FF - the content if accumulator
LXIH, 0701 - when the program counter
MVI A, 20 H - reaches 0109 H is

S U BM

a.

20 H

b.

02 H

c.

00 H

d.

FFH

Discuss
Answer: (a).20 H
Q844.
In 8085 microprocessor, what is the length of PC (program counter)?

a.

6 bits

b.

8 bit

c.

12 bits

d.

16 bits

Discuss
Answer: (d).16 bits
Q845.
In decimal system the base of radix is

a.

0

b.

1

c.

10

d.

e

Discuss
Answer: (c).10
Q846.
The subtraction of a binary number Y from another binary number X, done by adding the 2's complement of Y to X results in a binary number without overflow. This implies that the result is

a.

-ve and is in normal form

b.

-ve and 2's complement form

c.

+ve and is in normal form

d.

+ve and in 2's complement

Discuss
Answer: (d).+ve and in 2's complement
Q847.
The decimal equivalent of the binary number 10110.0101011101 is

a.

22.2408216500

b.

22.3408216750

c.

22.3408213125

d.

22.3408203125

Discuss
Answer: (d).22.3408203125
Q848.
In standard TTL the totem pole stage refers to

a.

multiemitter input stage

b.

phase splitter

c.

output buffer

d.

open collector output stage

Discuss
Answer: (c).output buffer
Q849.
In 8085 microprocessor the value of the most significant bit of the result following the execution of any arithmetic or Boolean instruction is stored in

a.

the carry status flag

b.

the auxiliary carry status flag

c.

sign status flag

d.

zero status flag

Discuss
Answer: (c).sign status flag
Q850.
A two-input OR gate is designed for positive logic. However, it is operated with negative logic. The resulting logic operation will then be

a.

OR

b.

AND

c.

NOR

d.

EX-OR

Discuss
Answer: (a).OR
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