Digital Electronics Unit 2

If A and B are the inputs of a half adder, the sum is given by __________

• A AND B

• A OR B

• A XOR B

• A EX-NOR B

. 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

• None of the above

The simplified expression of full adder carry is ____________

• c = xy+xz+yz

• c = x+y+z

• c = xy+yz

• c = xy+xz

The full subtractor can be implemented using ___________

• Two XOR and an OR gates

• Two half subtractors and an OR gate

• Two multiplexers and an AND gate

• Two comparators and an AND gate

One output of a full subtractor is same as ____________

• Half adder

• Full adder

• Half subtractor

• Decoder

What is one disadvantage of the ripple-carry adder?

• The interconnections are more complex

• More stages are required to a full adder

• It is slow due to propagation time

• All of the Mentioned