## Download Question Paper of "Digital Circuits and Logic Designs 2" , Question Paper of BCA 2nd Semester, Subject Code : BSBC - 205, Paper ID 802091, Paper 3

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Total No. of Questions : 07
BCA (Sem. - 2"d')
DIGITAL CIRCTITS AND LOGIC DESIGN
SUBJECT QODE : BC-205
Paper ID : 
[Note : Please fill subject code and paper ID on OMR]
Time : 03 Hours
Instruction to Candidates:
1) Section - A is Compulsory.
2) Attempt any Four questions from Section - B.
Section - A
Ql)
a) Differentiate between sequential and combinational logic circuits.
b) Give the truth table for J-K flip flop. How is it better than S-R flip
flop?
c) Define minterm and maxterm.
d) Using 8-bits, represent the integers -48in
(i) One's complement form.
(ii) Two's complement form.
e) Convert 532.37210into its binary equivalent.
f) Explain the difference between the terms characteristic table and
excitation table.
g) What is encoder?
h) How T-flip flop can be implemented using NAND gate?
i) What is multiplexer?
j) Express the Boolean function F=xy+x’y as a product of max terms.
Section - B
Q2) (a) Simplify the following Boolean function using a K-map.
ƒ(A, B, C, D) = ∑m(0, 1,2,3,8,9, 10, l1, 12, 13, 14, 15)
(b) Minimize the following function Fusing K-map.
F(A, B, C)=BC + ABC+ ABC
Q3) (a) Write the truth table of an OR gate and explain its behaviour. Realize an
OR gate using NAND gates only.
(b) Draw the circuit of a radix-8 synchronous up counter and using timing
diagrams explain its working.
Q4 Describe in detail error detecting and effort correcting codes. Bring out their
Q5) Design a counter to count the sequence 000,001,011, 111, 110, 100,000...
Q6) Design a sequential circuit with 4 JK Flip-Flops ABCD, the next states of B,C, D are equal to the present states of A, B, C. The next state of A is equal to the EX-OR of the present states of C and D.

Q7) What is a shift register? What are its various types? What are its applications?