JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech II Year SWITCHING THEORY AND LOGIC DESIGN Previous Question Paper (December - 2017 - R15)
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. Each question carries 10 marks and may have a, b, c as sub questions.
Part A
What is ASCII code?
Answer
ASCII stands for American Standard Code for Information Interchange. It is a 7-bit character encoding standard used to represent text in computers, telecommunications equipment, and other devices, assigning a unique numeric value to each character, digit, and control symbol.
How do you obtain dual of an expression?
Answer
To obtain the dual of a Boolean expression, replace every AND operator with an OR operator, every OR operator with an AND operator, and complement every individual constant (0 becomes 1, 1 becomes 0). Variables remain unchanged.
What are don’t cares?
Answer
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What is minterm?
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Why subtractor ICs not available?
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Compare a Latch and flip-flop.
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What are the basic types of shift registers?
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What are the advantages of synchronous counters?
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Explain capabilities of finite state machine.
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Explain concept of minimal cover table.
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Part B
Covert 105.1510 to binary, octal and hexadecimal.
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What is hamming code? How is the hamming code word tested and corrected?
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Simplify the following Boolean expressions using the Boolean theorems: (i) (ABC) + (B'C) + (AD) + (A'C) (ii) (AB) + (AB') + (A'B)
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Realize XNOR gates using only NAND gates.
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Simplify Y = ∑ m(3,6,7,8,10,12,14,17,19,20,21,24,25,27,28) using K-map method.
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Obtain i) minimal SOP and ii) minimal POS expressions for the following function F(A,B,C,D)= ∑ m(0,1,5,8,9,10).
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Obtain the minimal SOP expression for the switching function using k-map. Y= ∑ m(1,5,7,13,14,15,17,18,21,22,25,29) + ∑ d(6,9,19,23,30). Draw and explain the logic diagram.
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What is meant by ‘edge triggered’? Differentiate SR-FF and JK-FF with their functional operation and excitation tables.
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Draw and explain the circuit diagram of positive edge triggered J-K flip-flop using NOR gates with its truth table. How race around conditions are eliminated?
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Discuss about synchronous and ripple counters. Compare their merits and demerits.
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What do you mean by universal shift register? Draw and explain its circuit diagram and operation.
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What are the Moore and Melay machines? Compare them.
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Explain the procedure for state minimization using the partition technique.
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Name the elements of an ASM chart and define each one of them.
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Explain the control subsystem implementation of weighing machine.
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