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# EE8351 Important Questions DIGITAL LOGIC CIRCUITS

## Sample EE8351 Important Questions DIGITAL LOGIC CIRCUITS:

1. Where the digital systems are used?

Digital systems are used extensively in computation and data processing, control systems, Communications and measurements. Since digital systems are capable of greater accuracy and reliability than analog systems, many tasks formerly done by analog are now being performed digitally.

2. What is the difference between analog and digital systems?

In a digital system the physical quantities or signals can assume only discrete values, while in analog systems the physical quantities or signals vary continuously over a specified range. EE8351 Important Questions Digital Logic Circuits

3. What is a binary number system and Why are binary numbers used in digital systems?

The number system with base (or radix) two is known as the binary number system. Only two symbols are used to represent the numbers in the system and these are 0 and 1.The outputs of the switching devices used in digital systems assume only two different values. Hence it is natural to use binary numbers internally in digital systems.

4. What is the difference between binary code and BCD?

Binary:

i. Any distinct element can be represented by a binary code.
ii. No limitation for the minimum or maximum number of elements required for coding the element. EE8351 Important Questions Digital Logic Circuits

BCD:

i. Only a decimal digit can be represented.
ii. It is a four bit representation.

6. What is a gray code and mention it‟s advantages.

A gray code is a non weighted code which has the property that the codes for successive decimal digits differ in exactly one bit.
The gray code is used in applications where the normal sequence of binary numbers may produce an error during the transition from one number to the next. EE8351 Important Questions Digital Logic Circuits

7. What is meant by non-weighted codes?

Each bit has no positional value i). Excess-3 code ii).Gray code iii).Five bit BCD

8. List the names of universal gates. Why it is named so?

NAND and NOR gates are universal gates. Because a combination of NAND gates or a combination of NOR gates can be used to perform functions of any of the basic logic gates EE8351 Important Questions Digital Logic Circuits

 Subject name DIGITAL LOGIC CIRCUITS Semester 3 Subject Code EE8351 Regulation 2017 regulation