JNTU
JNTU B.Tech II SWITCHING THEORY AND LOGIC DESIGN Previous Question Paper (April/May - 2023 - R13)
Note: i) Question paper consists of Part A, Part B. ii) Part A is compulsory, which carries 25 marks. In Part A, Answer all questions. iii) In Part B, Answer any one question from each unit. Each question carries 10 marks and may have a, b as sub questions.
Part A
Convert (67A9)16 into decimal.
Answer
To convert the hexadecimal number (67A9)16 to decimal, multiply each digit by 16 raised to the power of its position (starting from 0 on the right):
Calculating each term:
Thus, (67A9)16 = 2653710.
Distinguish between weighted and non-weighted codes with example.
Answer
Weighted codes are number systems where each digit position is assigned a specific weight, such that the value of the number is the sum of the products of each digit and its corresponding weight. In contrast, non-weighted codes do not assign a specific positional weight to each digit, meaning the value of the code cannot be determined by a simple summation of weighted positions.
Weighted Code Example: The Binary Coded Decimal (BCD) 8421 code. For instance, in the code 1001, the value is calculated as (1×8) + (0×4) + (0×2) + (1×1) = 9.
Non-Weighted Code Example: The Excess-3 code. This code is derived by adding 3 to the decimal digit before converting to binary; it does not follow a positional weight system, making it useful for arithmetic operations like subtraction using nines' complements.
What are minterms and maxterms? Give examples for each.
Answer
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Write the functions of a decoder and multiplexer.
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Write the excitation table of SR flip flop.
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Differentiate between a latch and a flip flop.
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Define state machine.
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Differentiate critical and non-critical race.
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Define the moore models.
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Write the capabilities of finite state machine.
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Part B
Give the Boolean expressions and truth tables used for following gates: a) AND b) NOR c) NAND d) OR e) NOT
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What is the specialty of unit-distance code? State the applications of them.
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i) Convert 110001.1010010 into hexadecimal. ii) Convert (423.25)10 into hexadecimal.
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Draw the logic circuit of a full subtractor and give its truth table.
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Obtain the simplified expression in product of sums. F(A,B,C,D) = π(0,1,2,3,4,10,11)
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Design a circuit for 4×1 binary multiplier.
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Define a multiplexer? Draw a 2:1 multiplexer for the function f(x,y,z)=∑(0,2,3,5,7)
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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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Convert an T Flip-Flop into JK Flip-Flop.
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Draw and explain the working of following flip-flops with truth table and excitation table: a) SR b) D
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Design 4-bit shift register using D flip-flops and explain its working with the help of timing diagrams.
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Draw and explain Universal register.
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Analyze latch with NOR gates, derive transition, flow and state tables.
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Design a counter with the following repeated binary sequence: 0,1,2,3,4,5,6, use JK flip-flops.
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Derive the state table for the ASM chart of data processor subsystem for the binary multiplier.
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Show the exit paths in an ASM block for all binary combinations of control variables x, y and z, starting from an initial state.
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