Digital Logic 2073
Long answer question
Attempt two questions (2x10=20)
1. Explain the magnitude comparator and also design a logic diagram for 4 bit magnitude comparator.
2. What do you mean by decoder? Design a 3 to 8 line decoder using 2 to 4 line decoder and explain it.
3. What do you mean by ripple counter? Explain the design procedure of sequential circuits.
Short answer questions
Attempt any eight questions (2x10=20)
4. Convert the following hexadecimal number to decimal and octal numbers.
a) 4FF
b) 6FED
5. Explain the error detection code with example.
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. 
7. Design half adder logic circuit using only universal gates.
8. Draw a logic circuit of 8*1 multiplexer.
9. Design the 4 bit parallel binary adder.
10. Explain the PLA with the block diagram.
11. Explain the R-S flip flop with truth table.
12. Explain the shift register with example.
13. Write short note on (any two):
a) Binary counter
b) State reduction
c) Negative edge triggering