This document contains two sets of exam questions for a Digital Logic Circuits course. Set 1 and Set 2 each contain 10 short answer questions and 5 long answer questions. The questions cover topics such as number representation, logic gates, logic families, combinational logic circuits, and sequential circuits. The document also lists the course outcomes related to students gaining knowledge of number systems, logic design techniques, sequential circuits, and programmable logic.

1. DEPARTMENT OF ELECTRICAL AND ELECTRONICS
IAT 1 – SET 1 – DLC – EE6301
ENGINEERING
IAT - I AUGUST 2014
SET-I
Sem & Branch : III & EEE(A/B) Date: 12th August, 2014
Subject : DIGITAL LOGIC CIRCUITS Duration : 3Hrs
Sub.code : EE 6301 Max.Marks: 100
Answer All Questions
Part-A [10 x 2 = 20Marks]
1. Convert (4021.2)5 to its equivalent decimal
2. Represent the decimal 8620 in BCD and Binary.
3. Perform subtraction using 9’s complement:5250-321
4. What are the advantages of CMOS?
5. Compare the various digital logic families.
6. What is meant by parity bit?
7. Implement OR gates using only NAND gates
8. State De Morgan’s theorem
9. How does don’t care condition in K map help for circuit simplification
10. Why digital circuits are more frequently constructed with NAND and NOR gates?
Part - B [5 x 16 = 80Marks]
[Answer any Five]
1. Demonstrate the CMOS logic circuit configuration and characteristics in detail.
2. Explain the concept, working and characteristics of TTL logic families.
3. Construct a Hamming code group for the information bits 100101 that enables single
error correction plus double error detection where the most significant bit of the code
group is for the overall even parity bit. Assume that errors occur in bit positions 2 and
9 of the above code group. Show how the double error is detected.
4. Simplify the Boolean expression: f(w,x,y,z)=Σm(0,1,3,7,8,12) +dc(5,10,13,14) using
SOP and POS form.
5. Implement the following function with either NAND or NOR gates. Use only four
gates. F=w’xz+w’yz+x’yz’+wxy’z, d=wyz

2. 6. A combinational logic circuit with four inputs and one output. The output is equal to
1 when i) all inputs are equal to 1 or ii) none of the inputs are equal to 1 or iii) an odd
number of inputs are equal to 1.
a. Obtain the truth table.
b. Find the simplified output functions in SOP form.
c. Draw the logic diagram.
7. Obtain the NAND logic diagram of a full adder from the Boolean function C=xy+xz+yz,
IAT 1 – SET 1 – DLC – EE6301
S=C’(x+y+z)+xyz.
Course Outcomes Program Outcomes
a. Now the Students are familiarized with
number systems and Different logic
families.
b. Students can able to design combinational
and sequential circuits using Karnaugh
Maps.
c. Students can able to design Synchronous
sequential circuits and analyse the operation
of flip flops.
d. Students can able to design Synchronous
sequential circuits and analyse the operation
of flip flops.
e. They can design with Complex
Programmable Logic, ROM, RAM, and
Field-Programmable Gate Arrays.
f. Students can Work with the commonly
encountered hardware library modules.
1. Engineering Knowledge: Apply knowledge of mathematics, science,
engineering fundamentals; inter discipline and an engineering specialization
to the solution of complex engineering problems.
2. Problem Analysis: Identify, formulate and analyze complex engineering
problems reaching substantiated conclusions using first principles of
mathematics, science and engineering.
3. Design / Development of solutions: Design solutions for complex
electrical and electronics engineering problems and design systems
components or processes that meet specified needs with appropriate
consideration for public health and safety, cultural societal and
environmental considerations.
4. Conduct Investigations of Complex Problems: Using research based
knowledge and research methods including design of experiments, analysis
and interpretation of data and synthesis of information to provide valid
conclusions.
5. Modern tool Usage: Create, select and apply appropriate techniques,
resources and emerging technology and including prediction and modelling
to complex engineering activities with an understanding of the limitations.
6. The engineer and society: Apply reasoning informed by contextual
knowledge to assess societal, health, safety and cultural issues and the
consequent responsibilities relevant to professional engineering practice.
7. Environment and sustainability: Understand the impact of professional
engineering solutions in societal and environmental contexts and demonstrate
knowledge of and need for sustainable development.
8. Ethics: Apply ethical principles and commit to professional ethics and
responsibilities and norms of engineering practice.
9. Individual and Team Work: Function effectively as an individual, and as
a member or leader in diverse teams and in multi disciplinary settings.
10. Communication: Communicate effectively on complex engineering
activities with the engineering community and with society at large, such as
being able to comprehend and write effective reports and design
documentation, making effective presentations and give and receive clear
instructions.
11. Life-long learning: Recognize the need for and have the preparation and
ability to engage in independent and life – long learning in the broadest
context of technological change.
12. Project Management and Finance: Demonstrate knowledge and
understanding of engineering and management principles and apply these to
one’s own work, as a member and leader in a team, to manage projects and in
multidisciplinary environments.

3. DEPARTMENT OF ELECTRICAL AND ELECTRONICS
IAT 1 – SET 1 – DLC – EE6301
ENGINEERING
IAT - I - AUGUST – 2014
SET-II
Sem & Branch : III & EEE (A/B) Date: 12th August, 2014
Subject : DIGITAL LOGIC CIRCUITS Duration : 3Hrs
Sub.code : EE 6301 Max.Marks: 100
Answer All Questions
Part-A [10 x 2 = 20Marks]
1. How does open collector output differ from the totem-pole outputs?
2. Write the 20 decimal digits in base 3.
3. Obtain the 2’s complements of the following numbers:1010101
4. Perform subtraction using 10’s complement:5250-321
5. Convert the hexadecimal number-A2BEF to Binary
6. Simplify X+XY.
7. Draw the truth table and logic circuit of half adder
8. State the important characteristics of TTL family
9. Which IC family offers (a) low propagation delay, (b) low power dissipation?
10. Define fan out.
Part - B [5 x 16 = 80Marks]
[Answer any Five]
1. Explain the concept, working and characteristics of DTL logic families.
2. Discuss the following: i).Totem pole output configuration ii) open collector output
configuration.
3. Construct a Hamming code group for the information bits 100101 that enables single
error correction plus double error detection where the most significant bit of the code
group is for the overall even parity bit. Assume that errors occur in bit positions 2 and
9 of the above code group.
4. Show how the double error is detected. Simplify the Boolean expression:
f(w,x,y,z)=Σm(0,1,3,7,8,12) +dc(5,10,13,14) using SOP and POS form.
5. Implement the following function with either NAND or NOR gates. Use only four
gates. F=w’xz+w’yz+x’yz’+wxy’z, d=wyz

4. 6. A combinational logic circuit with four inputs and one output.The output is equal to 1
When i) all inputs are equal to one or ii) none of the inputs are equal to 1 or iii)an odd
number of inputs are equal to one.
a. Obtain the truth table.
b . Find the simplified output functions in SOP form.
c. Draw the logic diagram.
7. Obtain the NAND logic diagram of a full adder from the Boolean function C=xy+xz+yz,
IAT 1 – SET 1 – DLC – EE6301
S=C’(x+y+z)+xyz.
Course Outcomes Program Outcomes
a. Now the Students are familiarized with
number systems and Different logic
families.
b. Students can able to design combinational
and sequential circuits using Karnaugh
Maps.
c. Students can able to design Synchronous
sequential circuits and analyse the operation
of flip flops.
d. Students can able to design Synchronous
sequential circuits and analyse the operation
of flip flops.
e. They can design with Complex
Programmable Logic, ROM, RAM, and
Field-Programmable Gate Arrays.
f. Students can Work with the commonly
encountered hardware library modules.
1. Engineering Knowledge: Apply knowledge of mathematics,
science, engineering fundamentals; inter discipline and an
engineering specialization to the solution of complex engineering
problems.
2. Problem Analysis: Identify, formulate and analyze complex
engineering problems reaching substantiated conclusions using first
principles of mathematics, science and engineering.
3. Design / Development of solutions: Design solutions for complex
electrical and electronics engineering problems and design systems
components or processes that meet specified needs with appropriate
consideration for public health and safety, cultural societal and
environmental considerations.
4. Conduct Investigations of Complex Problems: Using research
based knowledge and research methods including design of
experiments, analysis and interpretation of data and synthesis of
information to provide valid conclusions.
5. Modern tool Usage: Create, select and apply appropriate
techniques, resources and emerging technology and including
prediction and modelling to complex engineering activities with an
understanding of the limitations.
6. The engineer and society: Apply reasoning informed by
contextual knowledge to assess societal, health, safety and cultural
issues and the consequent responsibilities relevant to professional
engineering practice.
7. Environment and sustainability: Understand the impact of
professional engineering solutions in societal and environmental
contexts and demonstrate knowledge of and need for sustainable
development.
8. Ethics: Apply ethical principles and commit to professional ethics
and responsibilities and norms of engineering practice.
9. Individual and Team Work: Function effectively as an
individual, and as a member or leader in diverse teams and in multi
disciplinary settings.
10. Communication: Communicate effectively on complex
engineering activities with the engineering community and with
society at large, such as being able to comprehend and write effective
reports and design documentation, making effective presentations and
give and receive clear instructions.
11. Life-long learning: Recognize the need for and have the
preparation and ability to engage in independent and life – long
learning in the broadest context of technological change.
12. Project Management and Finance: Demonstrate knowledge and
understanding of engineering and management principles and apply
these to one’s own work, as a member and leader in a team, to
manage projects and in multidisciplinary environments.

5. IAT 1 – SET 1 – DLC – EE6301

6. IAT 1 – SET 1 – DLC – EE6301