JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech II DIGITAL LOGIC DESIGN AND COMPUTER ORGANIZATION Previous Question Paper (March - 2021 - R15/R13)
Answer any five questions. All questions carry equal marks.
Main
Solve for x: i) (257)8=(x)2 ii) (21.625)10 = (x)8 iii) (BC.2)16 = (x)8 iv) (33)10= (201)x
Answer
i) To convert (257)8 to binary, replace each octal digit with its 3-bit binary equivalent: 2=010, 5=101, 7=111. Thus, (257)8 = (010101111)2.
ii) To convert (21.625)10 to octal, convert the integer part 21: 21/8 = 2 remainder 5, 2/8 = 0 remainder 2. Integer part = (25)8. For the fractional part 0.625: 0.625 × 8 = 5.0. Fractional part = (.5)8. Thus, (21.625)10 = (25.5)8.
iii) To convert (BC.2)16 to octal, first convert to binary: B=1011, C=1100, 2=0010. Binary is 10111100.0010. Group bits into threes from the radix point: 010 111 100 . 001 000. This gives (274.10)8.
iv) For (33)10 = (201)x, the equation is 2x2 + 0x1 + 1x0 = 33. Simplifying, 2x2 + 1 = 33, so 2x2 = 32, x2 = 16, x = 4.
Express the Decimal Digits 0-9 in BCD, 2421, 84-2-1 and Excess-3.
Answer
| Decimal | BCD (8421) | 2421 | 84-2-1 | Excess-3 |
|---|---|---|---|---|
| 0 | 0000 | 0000 | 0000 | 0011 |
| 1 | 0001 | 0001 | 0111 | 0100 |
| 2 | 0010 | 0010 | 0110 | 0101 |
| 3 | 0011 | 0011 | 0101 | 0110 |
| 4 | 0100 | 0100 | 0100 | 0111 |
| 5 | 0101 | 1011 | 1011 | 1000 |
| 6 | 0110 | 1100 | 1010 | 1001 |
| 7 | 0111 | 1101 | 1001 | 1010 |
| 8 | 1000 | 1110 | 1000 | 1011 |
| 9 | 1001 | 1111 | 1111 | 1100 |
Simplify and realize the following Boolean expression using logic gates.
Y = AB + A'C + BC
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Y = (A + B' + C')(A + B' + C)
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Describe the operations performed by the following logic circuits with an example:
Comparator
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Decoder
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Encoder
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Draw logic circuit and write the truth table of the following flip flops: i) D flip-flop ii) T flip-flop
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Draw logic circuit and explain the operation of serial in serial out left shift registers by using D flip-flop.
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What is addressing mode? Name various addressing modes and give examples.
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Explain the fixed point representation with an example.
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Explain the register structure of IA-32 Pentium processor.
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Discuss about Instructions and Instruction Sequencing.
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Distinguish between micro programmed control and hardwired control.
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Define Virtual memory and explain its memory organization.
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Explain the functioning of the DMA controller with a neat diagram.
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Define interrupt. How does hardware interrupt work?
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