EC6302 Digital Electronics, Second year, Department of Electronics & Communication Engineering, First and second Units Questions
PART A (10*2=20)
1.Apply De-Morgan’s theorem to simplify A+BC.
2. Define the term prime implicants and Essential prime implicants.
3.Draw the XOR logic using only NAND gates.
4.Implement the following Boolean function with NOR – NOR logicF = Π(0,2, 4,5,6)
5.Express the switching function f (ABC) = B in terms of minterm.
6.What is combinational circuit? Give examples.
7. Draw the block diagram of n-bit parallel adder
8.Write an expression for borrow and difference in a full Subtractor circuit.
9.Write down fan-in & fan-out of a standard TTL IC.
10.Define the term (i). Propagation delay (ii). Power dissipation
PART B(13*5=65)
11. Simplify the following function using K – map, f=ABCD+AB’C’D’+AB’C+AB &
realize the SOP using only NAND gates and POS using only NOR gates (10)
12. Reduce the following equation using QuineMcClucky method of minimization F(A,B,C,D) = ∑m(0,1,3,4,5,7,10,13,14,15)                                                                      (13)
13.Explain the operation of carry look ahead adder with neat diagram (13)
14.Draw and explain the BCD adder circuit. (13)
15.Implement the expression Y (A, B, C) = ∏M (0, 2, 4, 5, 6,) using only NOR-NOR
logic. (05)
(ii). Draw the schematic and explain the operation of a CMOS inverter.(08)
PART C (15*1=15)
16.Design & implement the conversion circuits for BCD to Excess – 3 code. (15)