JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech II DIGITAL LOGIC DESIGN Previous Question Paper (November/December - 2017 - R15)

Convert the hexadecimal member 68BE to binary and then from binary to octal number.

Write about error detecting and error minimizing codes with examples.

Define pair, quad and octet with examples in K – maps.

Explain SOP and POS of Boolean functions.

Write the logic diagram and truth table of a Full – adder.

What is an encoder? Write the truth table of a parity encoder.

What are sequential circuits? Give some examples.

Explain the working of a 4 – bit ripple counter with help of truth table.

List various types of semiconductor memories and write their uses.

What are programmable logic arrays? What are their applications?

Explain various number systems used in digital logic design with examples and their representation with examples.

Simplify the following Boolean functions to a minimum number of literals (i) (x+y)(x'+y) (ii) xy+x'z+yz

Explain about signed binary number and Floating point representation of number system with examples and discuss their advantages.

Express the Boolean function F = A + B'C in a sum of Minterms and write its truth table.

Explain the design procedure for 4 – variable K – map and discuss its simplification methods using prime implicants methods.

Simplify the Boolean function using K- map method. F(A, B, C, D) = Σ(0, 1, 2, 4, 5, 6, 8, 9, 12, 13, 14)

Implement the following Boolean function with NAND gates after simplification F(A, B, C) = Σ(1, 2, 3, 4, 5, 7)

Simplify the following Boolean function in sum of products and product of sums F(A, B, C, D) = Σ(0, 1, 2, 5, 8, 9, 10)

Design a combinational circuit that converts a 4-bit Gray code to a 4-bit binary number. Implement the circuit with XOR gates.

Design a BCD to decimal decoder using the unused combinations of the BCD code as don’t care conditions.

Explain the design procedure for constructing BCD adder – subtractor circuit using BCD adder and 9’s complementer block diagrams.

Construct a 4 to 16 line decoder with five 2 – to - 4 – line decoder with enable.

Explain the state equation, state table and state diagrams of sequential circuit with block diagram.

Draw the block diagram of a 4 bit synchronous Binary counter using J-K Flip-flops.

Explain the analysis of clocked sequential circuit using T Flip Flops with help of circuit diagram, state diagram and state table.

Draw the block diagram of a 4 bit universal shift Register and explain its working with its function table.

Explain about memory decoding and address multiplexing in memories with the help of neat diagrams.

Draw the logic diagram of a Programmable Logic Array with 3 inputs, 4 product terms and 2 outputs.

Discuss various types of sequential programmable devices with block diagrams.

Tabulate the PLA programming table for the following Boolean functions and minimize the number of product terms: A(x,y,z) = Σ(1,2,4,6), B(x,y,z) = Σ(0,1,6,7), C(x,y,z) = Σ(2,6), D(x,y,z) = Σ(1,2,3,5,7)