## Digital Circuits And Logic Design Question Paper of 3rd Semester BCA Download Previous Years Question Paper 2

• Friday, September 02, 2016

Roll No.
Total No. of Questions : 07
BCA (Sem.–3rd)
DIGITALCIRCUITS & LOGIC DESIGN
Subject Code : BSBC-303
Paper ID : [B0230]
Time : 3 Hrs.
INSTRUCTION TO CANDIDATES :
1. Section-A is compulsory.
2. Attempt any Four questions form Section-B.

SECTION-A
Q. 1.

(a) Which gates are called Universal gates and why?
(b) Ad -29 and 12 using 2’s complement.
(c) Write a note on half adders.
(d) State the De-Morgan’s theorem.
(e) Write a note on master slave J-K Flip Flops.
(f) What is a race condition? How can it be removed?
(g) Differentiate between synchronous and asynchronous counters.
(h) How many flip flops are required to construct a binary-n Modulo Counter.
(i) What will be the binary representation of number (199)10. (j) What wil be the reduced expression for function BC+AC’+AB+BCD.

SECTION-B

Q. 2. Write a note on the following:

(a) XNOR and NAND gates
(b) State the applications of logic gates

Q. 3. Simplify the Boolean Function F with don’t care condition in sum of  products form

F(w, x, y, z)=∑(0,1,2,3,7,8,10)
D(w, x, y, z)=∑(5,6,1,15)

Q. 4. What are multiplexers and implement he Boolean Function F(A,B,C)=∑(1,3,5,6) using 4x1 multiplexer.

Q. 5. What are sequential Circuits? State the advantage of synchronous sequential circuits over asynchronous sequential circuit and Discus the R-S flip flop and T Flip Flops.

Q. 6. What are counters? Illustrate the design of synchronous counters.

Q. 7. Write a note on

(a) Encoders

(b) Up down counters