16.
227
18.
19
20.
21.

22.

23.

24.

25.

26.
` 27.

28.

30.
31.

2 D 12394
Part C

Answer any five questions.
Each question carries 4 marks.

Convert (25.16), to binary and (946.152),, to binary.
Perform BCD addition on (a) 67 + 53 ; (b) 55 + 25.
State and prove De Morgans theorems. 1 |
What is a half adder ? Explain a half adder with truth table and logic diagram.
What is a decoder ? Compare a decoder and a demultiplexer with suitable block diagrams.
With the help of a truth table explain the working of an 8 x 3 encoder. Draw the logic diagram
using gates.
What is a flip-flop ? What is the difference between a latch and a flip-flop ? List out the applications
of flip-flop
Prove that any Boolean function can be expressed as the product of max terms or sums

(قكاتهم 20 = 4 > 5( :

Part D

Answer any five questions.
Each question carries 8 marks.

Using K-map simplify the expression /(w, x, y, z)= = (1, 3, 7, 11, 15) and d (w, x, y, z) = = (0, 2, 5).
Draw the logic diagram of the simplified expression.

Explain the following conversions with suitable examples : (a) decimal to Octal ; (b) Octal to
binary ; (c) Hexadecimal to Octal.

With the help of a neat diagram explain the working of successive approximation A/D converter 1

Distinguish between combinational logic circuits and sequential logic circuits. How are the design
requirements of combinational circuits specified ?

Design a 3 bit up/down counter using JK flip-flop and explain its function with timing diagram.

- Simplify the Boolean expression F = (A + E + C) (A+B +C)(A+E). Realize the simplified expression

using only NAND gates
Explain the operation of Master slave JK flip-flop with truth table and logic diagram.
Write notes on :
(a) Basic logic gates.
(b) Demultiplexer trees.
(c) Simultaneous method of A/D conversion.
(5 x 8 = 40 marks)