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Exam. Code 107202 Subject Code 2044: Principles of Digital Electronics BCA Semester-II

This document contains an exam paper for the subject BCA Semester-II Principles of Digital Electronics. It lists 8 questions, asking students to attempt any 5. The questions cover various topics in digital electronics including: [1] showing NAND gates are universal and performing arithmetic operations using 2's complement, [2] De Morgan's theorems and don't care conditions, [3] logic expressions and number systems, [4] designing a full adder circuit, [5] designing an SR flip flop and deriving a D flip flop, [6] explaining counters and static vs dynamic devices, [7] explaining RAM cells and memory operations, and [8] types of memory and address selection logic in

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690 views2 pages

Exam. Code 107202 Subject Code 2044: Principles of Digital Electronics BCA Semester-II

This document contains an exam paper for the subject BCA Semester-II Principles of Digital Electronics. It lists 8 questions, asking students to attempt any 5. The questions cover various topics in digital electronics including: [1] showing NAND gates are universal and performing arithmetic operations using 2's complement, [2] De Morgan's theorems and don't care conditions, [3] logic expressions and number systems, [4] designing a full adder circuit, [5] designing an SR flip flop and deriving a D flip flop, [6] explaining counters and static vs dynamic devices, [7] explaining RAM cells and memory operations, and [8] types of memory and address selection logic in

Uploaded by

Satnam Azrot
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© © All Rights Reserved
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Exam. Code 107202


SubjectCode 2044

BCA Semester-II
PRINCIPLES OF DIGITAL ELECTRONICS
Paper-II
Time Allowed-3 Hours] [Maximum Marks-75

Note: Attempt any FIVE questions.


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1. (a) Show that NAND gates are universal gates. 7.5


(b) Using 2's complement notation perform the following

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arithmetic operations using 8 bit register(s) :
(i) 25 + (-12) (ii) 17 - 6
(iii) -18 - 16 (iv)- 18 + (18)
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(v) 12-(-19) 7.5
2. (a) Discuss in brief De Morgan's theorems with example.
(b) Write a short note on don't care conditions.
(c) Simplify the expression:
AB + A(B + C) + B (B + C). 5x3
3. (a) Explain SOP form and POS form oflogic expression.
(b) What is meant by the base of a number system? Give
examples to illustrate the role of base in positional
number system.
(c) Distinguish between combinational and sequential
circuits. 5x 3

3082(25 I 7)/STB-14035 (Contd.)

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4. Write the truth table of a Full Adder and then from it


derive the circuit in terms of half adders. 15
5. Draw the circuit of an S-R Flip Flop using NAND
gates only. From it derive the circuit of a D-Flip Flop
and explain its truth table. 10
Draw the circuit of a 2 to 4 decoder and explain its
function. 5
6. (a) What are counters? Explainthe working of a typical
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counter in detail. 10
(b) Distinguish between static and dynamic devices.

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5
7. (a) Explain the working of a RAM cell. 10
(b) Explain the read and write memory operations in
detail. 5
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8. (a) Explain various types of memory and their
characteristics. 10
(b) Explain the address selection logic in PROMS.
5

3082(2517)/STB-14035 9000

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