JNTU
JNTU B.Tech II DIGITAL LOGIC DESIGN Previous Question Paper (November/December - 2018 - R16)
Note: This question paper contains two parts A and B. Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit.
Part A
Write the advantages of floating-point representation.
Answer
The primary advantages of floating-point representation are its ability to represent a significantly wider range of values, including both very large and very small numbers, compared to fixed-point representation. Additionally, it provides a consistent level of precision across this wide range by maintaining a fixed number of significant digits through the normalization of the mantissa.
Distinguish between weighted and non-weighted codes with example.
Answer
Weighted codes are those in which each bit position is assigned a specific positional weight, such that the decimal value of a number is calculated by summing the products of each bit and its corresponding weight. An example is the BCD (8421) code, where the weights are 8, 4, 2, and 1.
Non-weighted codes do not assign a fixed positional weight to each bit position. The value represented by the code is not determined by a simple sum of weighted bits, but rather by the specific pattern of the code itself. An example is the Excess-3 code or Gray code, which are used for specific logical properties rather than direct arithmetic weighting.
What is the use of don’t care combinations?
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Implement the following function using only NOR Gates F=a.(b+ c) + (b. c).
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Define a combinational circuit, give its block diagram.
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Write a short notes on priority encoder.
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Differentiate between a latch and a flip flop.
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Define Hazard. Mention various types of hazards.
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Why programmable AND gates are used in PLA instead of a decoder.
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Write the applications of logical micro operations.
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Part B
Implement AND, OR, NOR by using NAND gates only.
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Derive the hamming code for the sequence (101011).
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Convert the following to the corresponding bases: i) (343)5 = ( )6 ii) (7654)8 = ( )10
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Explain about even and odd parity check with an example, what is the drawback.
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Derive the sum of minterms for f(a,b,c,d)=a'b+ab'd+c'd
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Derive and Implement Exclusive OR function involving three variables using only NAND function.
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Obtain the simplified expression in POS (product of sums) of F(w,x,y,z)=π(1,2,4,7,12,14,15) using K-maps.
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Implement the function f(a,b,c)=Σ(1,3,4,6) using NOR-NOR two level gate structure.
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Realize a full subtractor using decoders.
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Define a multiplexer? Draw a 2:1 multiplexer for the function f(x,y,z)=Σ(0,2,3,5,7)
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Write the steps involved in designing a combinational circuit.
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What is the drawback of JK flip flop, design a flip flop which overcomes this drawback and explain with neat diagram.
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Draw the block diagram of asynchronous sequential circuit.
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Analyze latch with NOR gates, derive transition, flow and state tables.
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Give the logic implementation of a 32 × 4 bit ROM using decoder of a suitable size.
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What do you mean by register transfer? Explain in detail. Also discuss Three state bus buffer.
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