Digital Logic 2073
Long answer question
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Attempt two questions (2x10=20)
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1. Explain the magnitude comparator and also design a logic diagram for 4 bit magnitude comparator.
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2. What do you mean by decoder? Design a 3 to 8 line decoder using 2 to 4 line decoder and explain it.
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3. What do you mean by ripple counter? Explain the design procedure of sequential circuits.
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Short answer questions
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Attempt any eight questions (2x10=20)
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4. Convert the following hexadecimal number to decimal and octal numbers.
a) 4FF
b) 6FED
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5. Explain the error detection code with example.
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6. Explain the duality theorem with example.
It states that “Every algebraic expression deducible from the postulates of Boolean algebra remains valid if the operators and identity elements are interchanged”. In a two-valued Boolean algebra, the identity elements and the elements of the set B are the same: 1 and 0. If the dual of an algebraic expression is desired, we simply interchange OR and AND operators and replace 1's by 0's and 0's by 1's.
E.g. 
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7. Design half adder logic circuit using only universal gates.
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8. Draw a logic circuit of 8*1 multiplexer.
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9. Design the 4 bit parallel binary adder.
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10. Explain the PLA with the block diagram.
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11. Explain the R-S flip flop with truth table.
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12. Explain the shift register with example.
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13. Write short note on (any two):
a) Binary counter
b) State reduction
c) Negative edge triggering
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