Assignment No. 1

Aim            Objective           Theory             Procedure            Simulation             Conclusion           FAQ

1. What is the difference between half adder and a full adder circuit?

2. What is the difference between half subtractor and a full subtractor circuit?

3. Design 4 bit Adder/ Subtractor circuit.

4. Half-adders have a major limitation in that they cannot __________

   • Accept a carry bit from a present stage

   • Accept a carry bit from a next stage 

   • Accept a carry bit from a previous stage 

   • Accept a carry bit from the following stages

5. The difference between half adder and full adder is __________

   • Half adder has two inputs while full adder has four inputs

   • Half adder has one output while full adder has two outputs 

   • Half adder has two inputs while full adder has three inputs 

   • All of the Mentioned

6. If A, B and C are the inputs of a full adder then the sum is given by __________

   • A AND B AND C 

   • A OR B AND C 

   • A Ex-OR B XOR C 

   • A OR B OR C

7. If A, B and C are the inputs of a full adder then the carry is given by __________

   • A AND B OR (A OR B) AND C 

   • A OR B OR (A AND B) C 

   • (A AND B) OR (A AND B)C 

   • A Ex-OR B Ex-OR (A Ex-OR B) AND C

8. How many AND, OR and Ex-OR gates are required for the configuration of full adder?

   • 1, 2, 2 

   • 2, 1, 2 

   • 3, 1, 2 

   • 4, 0, 1