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Test: Adders - Electronics and Communication Engineering (ECE) MCQ


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10 Questions MCQ Test Digital Circuits - Test: Adders

Test: Adders for Electronics and Communication Engineering (ECE) 2024 is part of Digital Circuits preparation. The Test: Adders questions and answers have been prepared according to the Electronics and Communication Engineering (ECE) exam syllabus.The Test: Adders MCQs are made for Electronics and Communication Engineering (ECE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Adders below.
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Test: Adders - Question 1

A logic circuit which perform the function of half-adder has:

Detailed Solution for Test: Adders - Question 1

Half Adder:

  • It is a Combinational Logic Circuit with two inputs and two outputs.
  • It is the basic building block for the addition of two single-bit numbers.
  • The half-adder circuit is designed to add two single-bit binary numbers.
  • The outputs of the circuit are Sum and Carry.
  • XOR gate is used to realize Sum.
  • AND gate is used to realize Carry

Fig: Representation of Half Adder

Truth Table of Half Adder

Fig: Logical Circuit Diagram of Half Adder

Test: Adders - Question 2

Identify logic function given below -

Detailed Solution for Test: Adders - Question 2

Concept:

Combinational Circuit: Combinational circuit is a circuit in which we combine the different gates in the circuit, for example, Half adder, Full Adder, Half Subtractor, Full Subtractor, encoder, decoder, multiplexer, and demultiplexer.

 Half Adder:

Boolean expressions for Sum and Carry (if A and B are the inputs)

Sum = A'B + AB' = ( A ⨁ B)

Carry= AB

→ Full Adder:

Boolean expressions for Sum and Carry (if A, B and C are the                           inputs)

Sum = A'B'C + A'BC' + AB'C' + ABC

Carry= AB + BC + AC

→ Half Subtractor:

 Boolean expressions for Difference and Borrow (if A and B are the                    inputs)

Difference = A'B + AB' = ( A ⨁ B)

Borrow = A'B

Analysis:

From the given circuit diagram

    X = [(A'B)' . (AB')']'

⇒ X = [(A + B') . (A'+B)]' [∵ (AB)' = (A' + B')]

⇒ X = [ AB + A'B']' = ( A ⨀ B)' = ( A ⨁ B)

    Y = ( A' + B')' = AB

Obtained boolean expression refers to Half Adder.

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Test: Adders - Question 3

Half adder circuit can be produced using a two-input ______ gate and a two-input ______ gate.

Detailed Solution for Test: Adders - Question 3

A half adder circuit is made up of an AND gate with an XOR gate as shown below:

  • A half adder is also known as XOR gate because XOR is applied to both inputs to produce the sum
  • Half adder can add only two bits (A and B) and has nothing to do with the carry
  • If the input to a half adder has a carry, then it will neglect it and adds only the A and B bits
  • That means the binary addition process is not complete and that's why it is called a half adder

Sum (S) = A⊕B, Carry = A.B

Test: Adders - Question 4

A full adder circuit has

Detailed Solution for Test: Adders - Question 4

The basic block diagram for a Full Adder is as shown:

A Full adder can be realized using two half adders as shown:

We, therefore, conclude that a full adder combinational circuit has 3 inputs and 2 outputs.

A full adder can be implemented using 2 XOR, 2 AND, 1 OR as shown in figure:

Test: Adders - Question 5

AND gate EXOR gate combination is ____ 

Detailed Solution for Test: Adders - Question 5

A half adder circuit is basically made up of and a AND gate with an XOR gate as shown below.

  • A half adder is also known as XOR gate because XOR is applied to both inputs to produce the sum
  • Half adder can add only two bits (A and B) and has nothing to do with the carry
  • If the input to a half adder has a carry, then it will neglect it and adds only the A and B bits
  • That means the binary addition process is not complete and that's why it is called a half adder

Sum (S) = A⊕B, Carry = A.B

Test: Adders - Question 6

In a half adder, the carry output is high if the inputs are:

Detailed Solution for Test: Adders - Question 6

The truth table for half adder is given below:

Test: Adders - Question 7

In half adder, the total number of inputs and outputs are:

Detailed Solution for Test: Adders - Question 7

Concept:

A half adder circuit is basically made up of and a AND gate with XOR gate as shown below.

  • A half adder is also known as the XOR gate because XOR is applied to both inputs to produce the sum.
  • Half adder can add only two bits (A and B) and has nothing to do with the carry.
  • Half adder has two inputs (A and B) and two outputs (S and C).
  • If the input to a half adder has a carry, then it will neglect it and adds only the A and B bits.
  • That means the binary addition process is not complete and that's why it is called a half adder.
Test: Adders - Question 8

Half adder is a logic circuit that accepts ________ single bit inputs.

Detailed Solution for Test: Adders - Question 8

Half adder circuit:

Half adder circuit has 2 inputs and 2 outputs.

A half adder circuit is basically made up of an AND gate and an XOR gate as shown below:

Sum (S) = A⊕B

Carry = A.B

The truth table is as shown:

Test: Adders - Question 9

The combination of two half adders is a _______.

Detailed Solution for Test: Adders - Question 9

A full adder circuit has three binary digit inputs (two input bits and one carry input bit) and two binary digit outputs, Sum bit and carry output bit.

A Full adder can be realized using two half adders as shown:

A full adder can be implemented using 2 XOR, 2 AND, 1 OR as shown in the figure:

Test: Adders - Question 10

How many input lines are there in a ‘Full Adder’?

Detailed Solution for Test: Adders - Question 10

Combinational Logic circuits are circuits for which the present output depends only on the present input, i.e. there is no memory element to store the past output.

A combinational circuit can have ‘n’ number of inputs and ‘m’ number of outputs as shown:

Full Adder:

  • It is a combinational circuit used for the addition of binary numbers.
  • It can add two one-bit numbers A and B, and carry C.
  • The full adder is a three-input and two output combinational circuit.

The basic block diagram for a Full Adder is as shown:

A Full adder can be realized using two half adders as shown:

A full adder can be implemented using 2 XOR, 2 AND, 1 OR as shown in figure:

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