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

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