The combination of two half adders is a ________.

This question was previously asked in
RRB ALP Electronics Mechanic 21 Jan 2019 Official Paper (Shift 3)
View all RRB ALP Papers >
  1. full adder
  2. Schimtt trigger
  3. Comparator
  4. half adder

Answer (Detailed Solution Below)

Option 1 : full adder
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Detailed Solution

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Half adder

The half adder is a type of combinational logic circuit that adds two 1-bit binary numbers.

It generates the carry and sum of both inputs.

A

B

Sum

Carry

0

0

0

0

0

1

1

0

1

0

1

0

1

1

0

1

Sum = A ⊗ B

Carry = AB

Full adder

The full adder is a type of combinational logic circuit that adds three 1-bit binary numbers.

The full adder is the combination of two half adders.

A

B

 Cin

Sum 

Cout 

0

0

0

0

0

0

0

1

1

0

0

1

0

1

0

0

1

1

0

1

1

0

0

1

0

1

0

1

0

1

1

1

0

0

1

1

1

1

1

1

Sum = A ⊗ B ⊗ Cin

Cout = AB + BCin + CinA

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