# EC8392 Important 16 mark Questions Digital Electronics

## Sample EC8392 Important 16 mark Questions Digital Electronics:

1. Using K-map simplify the expression Y (A, B, C, D) = m1+m3+m5+ m7+m8+m9+
m0+m2+m10+m12+m13. Indicate the prime implicants, essential and non-essential
prime implicants. Realize the logic circuit using AND-OR-INVERT gates and also
by using NAND gates. (16)
2. Obtain the simplified function for the Boolean function Y (A, B, C, D) = m1+m3+m5+
m7 +m8+m9+ m0+m2+m10+m12+m13 using Quine McClusky method. Obtain the
NAND and NOR implementation of the simplified expression.
(16) EC8392 Important 16 mark Questions Digital Electronics
3. Obtain the minimum SOP using Quine McClusky method and verify using K- map
F= m0 + m2+m4+m8+m9+m10+m11+m12+m13. (16)
4. Determine the prime implicants of the following function and verify using K-map
F(A,B,C,D) = Σ(3,4,5,7,9,13,14,15). (16)
5. Simplify using K-map to obtain a minimum POS expression for the function
F = (A’ + B’ + C + D) (A + B’+ C + D) (A + B + C + D’) (A + B + C’ + D’)
(A’+ B + C + D’)(A + B + C’ + D). (8)
6. Write short notes on i) alphanumeric codes and ii) Error detection and correction
methods (6) EC8392 Important 16 mark Questions Digital Electronics
7. i. Simplify F (A,B,C,D) = Σm ( 1,3,5,8,9,11,15) + Σd (2,13).If don’t care conditions
are not taken into care what will be the simplified Boolean function? Write your
comments on it. Implement both circuits using logic gates. (12)
ii. Add 26 and 39 using Excess-3 code. (4)
8. Simplify using five variable mapping
F =(8,9,10,11,13,15,16,18,21,24,25,26,27,30,31) (16)
9. State and prove De – Morgan’s theorems using two variables. (6)
10. Realize the functions of NOT, AND, OR and NAND gates only with NOR gates. (8) EC8392 Important 16 mark Questions Digital Electronics
11. i. Convert the decimal 65 to BCD, Excess-3 and Gray code (4)
ii. Encode data bits 1001 into a seven bit even parity Hamming code. (4)
12. Simplify the following Boolean function in SOP and POS form using K-map
F ( A,B,C,D) = Σm( 3,4,9,13,14,15) + Σd ( 2,5,10,12) (8)
13. Simplify the following function using K – map and tabular methods. Compare the
methods. F ( A,B,C,D) = Σm(4,5,6,7,8) + Σd (11,12,13,14,15).Implement the
result using NAND gates. EC8392 Important 16 mark Questions Digital Electronics

 Subject name Digital Electronics Semester 3 Subject Code EC8392 Regulation 2017 regulation