NATIONAL OPEN UNIVERSITY OF NIGERIA

UNIVERSITY VILLAGE, PLOT 91, CASDASTRAL ZONE, NNAMDI AZIKIWE EXPRESS WAY, JABI, ABUJA.
FACULTY OF SCIENCES
APRIL 2019 EXAMINATION

COURSE CODE: CIT344

COURSE TITLE: Introduction to Computer Design

CREDIT: 3 Units

TIME ALLOWED: 2½ Hours

INSTRUCTION: Answer Question 1 and any other FOUR (4) Questions

 

1a) Briefly explain the Repeated Division-by-2 method.  (4 marks)

 b) Convert 111010110101110010110 in binary to Octal     (2 marks)

 c) State the advantages of assembly language over high level languages. (4 marks)

d) Compare the ASCII code and the Extended ASCII code (3 marks)

e) Briefly explain the term combinational logic circuit. (2½ marks)

f) Complete the Logic Function Generator based on 3-Variable Logic Function Table below:           (2 marks)

 

Input

Output

A

B

C

Y

0

0

0

 

0

0

1

 

0

1

0

 

0

1

1

 

1

0

0

 

1

0

1

 

1

1

0

 

1

1

1

 

 

 

g) State the following the Sum and the Carry-out Boolean expressions for a Full-Adder.  (3 marks)

h) List the three different types of edge-triggered flip-flops generally used in digital logic circuits. (1½ marks)

 

2a) Briefly explain how a combinational logic circuit can be analysed and designed. (6 marks)

b) What is a DeMUX? (2 marks)

c) List two (2) forms of DeMUX. (2 marks)

d) What is a Gray code? (2 marks)

 

3a) What do you understand by the term ‘decoder’? (2 marks)

b) Give the truth table and logic symbol of a 2-to-4 Decoder. (3 marks)

c) Distinguish between Jumps and Loops (2 marks)

d) List the five ways of modeling the behaviour of finite state machines (5 marks)

 

4a) Enumerate any four different forms of Call instructions. (4 marks)

b) State the functions of the far call instruction (4 marks)

c) Briefly describe a sequencer, giving at least one example of a sequencer. (2 marks)

d) Write short notes on Read and Write Signals. (2 marks)

 

5a) State the functions of the near call instruction (3 marks)

b) State the function of an edge-detector? How does it perform this function? (2 marks)

c) Describe the Displacement-only addressing mode (5 marks)

d) State four uses of Edge-Triggered J-K Flip-Flops. (2 marks)

 

6a) State the two basic operations performed on memories and the signals typically used to support them.    (6 marks)

b) State the two major functions of a register. (2 marks)

c) Outline four of the different forms of shift operations of a register. (4 marks)


Select NOUN Past Questions & Answers by Faculties

Sciences

National Open University of Nigeria (NOUN) Faculty of Sciences Past Questions and Answers.

Education

National Open University of Nigeria (NOUN) Faculty of Education Past Questions and Answers.

Arts & Social Sciences

National Open University of Nigeria (NOUN) Faculty of Arts and Social Sciences Past Questions and Answers.

Law

National Open University of Nigeria (NOUN) Faculty of Law Past Questions and Answers.

Management Sciences

National Open University of Nigeria (NOUN) Faculty of Management Sciences Past Questions and Answers.

Health Sciences

National Open University of Nigeria (NOUN) Faculty of Health Sciences Past Questions and Answers.

Agriculture Sciences

National Open University of Nigeria (NOUN) Faculty of Agricultural Sciences Past Questions and Answers.

Select Project Topics & Materials by Categories

Accounting

Universities, Polytechnic's and Colleges of Education Accounting Project Topics and Materials.

Biology

Universities, Polytechnic's and Colleges of Education Biology Project Topics and Materials.

Business Education

Universities, Polytechnic's and Colleges of Education Business Education Project Topics and Materials.

Chemistry

Universities, Polytechnic's and Colleges of Education Chemistry Project Topics and Materials.

Computer Science

Universities, Polytechnic's and Colleges of Education Computer Science Project Topics and Materials.

Criminology & Security

Universities, Polytechnic's and Colleges of Education Criminology & Security Project Topics and Materials.

Economics

Universities, Polytechnic's and Colleges of Education Economics Project Topics and Materials.

Education

Universities, Polytechnic's and Colleges of Education Education Project Topics and Materials.

English/Linguistic

Universities, Polytechnic's and Colleges of Education English/Linguistic Project Topics and Materials.

Entrepreneurship

Universities, Polytechnic's and Colleges of Education Entrepreneurship Project Topics and Materials.

Environmental Science

Universities, Polytechnic's and Colleges of Education Environmental Science Project Topics and Materials.

Law

Universities, Polytechnic's and Colleges of Education Law Project Topics and Materials.

Marketing

Universities, Polytechnic's and Colleges of Education Marketing Project Topics and Materials.

Physics

Universities, Polytechnic's and Colleges of Education Physics Project Topics and Materials.

Political Science

Universities, Polytechnic's and Colleges of Education Political Science Project Topics and Materials.

Public Administration

Universities, Polytechnic's and Colleges of Education Public Administration Project Topics and Materials.

Facebook posts