University of Kashmir 2007-1st Year B.C.A Computer Application Annual regular - Question Paper

BCA1(B)
Subject Code : 22348
Total ques. : 9
Total Printed Pages : three Maximum Marks : 100
Digital Electronics Minimum Marks : 40
Time Allowed : 2*1/2Hours

Note :-Attemt all ques. from part a and b and only 2 ques. from part c.

part A (Very short ans kind ques. to be answered in about 10-20 words). 8*2*1/2.

1.(i) What is a logic gate? elaborate positive and nagetive logic systems ?

(ii) elaborate fault detection and correction codes ? discuss parity code .

(iii) What is a code converter ? Design a logic circuit for converting four bit binary code to gray code.

(iv) discuss NAND and NOR gates. Why are they called Universal gates ?

(v) describe flip flop, latch. elaborate the applications of flip flop ?

(vi) describe modulus of a counter. What is tghe maximum modulus of three bit binary counter ?

(vii) discuss speed power product of logic gate ?

(viii) describe noise, noise immunity and noise margin.


part B (Short ans kind ques. to b e answered in about 200-250 words). 4*10=40

2. What is Hamming code ? Construct even parity 7 bit Hamming code to transmit data 0100.

3. describe Half adder and Full adder. Draw the logic circuits and write the truth tables of both.

4. What is the difference ranging from Synchrionous and Asynchronous counter ? discuss four bit Asynchronous DOWN counter in detail.

5. elaborate digital IC's ? discuss SSI, MSI, LSI, VLSI, and ULSI .


part C(Long ans kind ques. to be answered in about 400-500 words). 2*20=40

6.(a) Convert the subsequent from Decimal to Binary:

(i) 14.625

(ii) 0.6940

(b) Convert the subsequent from Binary to Hexadecimal:

(i) 1100101111111

(ii)1111011.1

(c) Convert the subsequent Hexadecimal to Decimal:

(i) 11A.62

(ii) AF.2F

(d) Multiply the following:

(i) 10111.01 * 1011

(ii)1011011 * 1011.1

7. What is a multiplexer ? elaborate the applicxations ? define 4*1 Multiplexer in detail.

8. With the help of neat labelled logic Diagram discuss the working of -ve edge triggered SR Flip-Flop. Draw truth table and Timming Diagram also.

9. describe ROM and its various kinds. discuss the 2 dimensional addressing of ROM.

Earning:   Approval pending.