JNTU
JNTU B.Tech II SWITCHING THEORY AND LOGIC DESIGN Previous Question Paper (November/December - 2017 - R13)
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.
Part A
What is Gray code?
Answer
Gray code is a non-weighted binary number system where consecutive values differ by only one bit. It is widely used in error detection and physical position encoders because it minimizes transitions between states.
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 interchange all 1s with 0s. Variables and their complements remain unchanged.
What are don’t cares?
Answer
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What is minterm?
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Compare combinational and sequential circuits.
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Explain about binary cell.
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What are the basic types of shift registers?
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Compare asynchronous and 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
Solve for x: (i) (367)8=(x)2 (ii) (378.93)10 = (x)8 (iii) (B9F.AE)16 = (x)8 (iv) (16)10 = (100)x
Answer
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Convert (163.875)10 to binary, octal, hexadecimal.
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Obtain dual of the following Boolean expressions: (i) AB+A(B+C)+B' (B+D) (ii) A+B+A'B'C.
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Obtain the compliment of the following Boolean expressions: (i) A'B+A'BC'+A'BCD+A'BC'D'E. (ii) ABEF+ABE'F'+A'B'EF.
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Minimize the following expression using K-map and realize using NAND Gates. F (A,B,C,D) = Σ m (0,1,2,9,11) +d(8,10,14,15).
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Minimize the following expression using K-map and realize using NOR gates. f = Π M(0,4,6,7,8,12,13,14,15)
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Explain the differences between a MUX and a DEMUX. Realize 16-input multiplexer by cascading of two 8-input multiplexers 74151.
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Realize the function f(A,B,C,D) = Π(1,4,6,10,14) + d (0,8,11,15) using (i) 16:1 MUX (ii) 8:1 MUX.
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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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Explain in detail about timing and triggering considerations sequential circuits.
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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 is a shift register? Explain about the following modes of operations in a four bit shift register (i) shift right (ii) shift left (iii) bidirectional.
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Explain the differences between ring and Johnson counters. Design and explain the operation of a decade Johnson counter.
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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 with example.
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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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