# 18 Lecture

## 2-INPUT 4-BIT MULTIPLEXER

A 2-input 4-bit multiplexer is a digital logic circuit that selects one of four input signals and outputs it based on the values of two selection inputs. It has four data inputs and two control inputs, with each input having a binary value of 0

## Important Mcq's Midterm & Finalterm Prepration Past papers included

1. How many data inputs does a 2-input 4-bit multiplexer have?

a) 2

b) 4

c) 8

d) 16

2. How many control inputs does a 2-input 4-bit multiplexer have?

a) 2

b) 4

c) 8

d) 16

3. What is the maximum number of inputs that a 2-input 4-bit multiplexer can select from? a) 2 b) 4 c) 8 d) 16 Answer: b) 4

4. In a 2-input 4-bit multiplexer, how many bits are used to represent the selection inputs? a) 1 b) 2 c) 4 d) 8 Answer: b) 2

5. What is the output of a 2-input 4-bit multiplexer if the selection inputs are 00 and the data inputs are 0110, 1011, 1100, and 1111? a) 0110 b) 1011 c) 1100 d) 1111 Answer: a) 0110

6. What is the output of a 2-input 4-bit multiplexer if the selection inputs are 10 and the data inputs are 0110, 1011, 1100, and 1111? a) 0110 b) 1011 c) 1100 d) 1111 Answer: d) 1111

7. What is the truth table for a 2-input 4-bit multiplexer? a) 16 rows b) 8 rows c) 4 rows d) 2 rows Answer: c) 4 rows

8. What is the main function of a 2-input 4-bit multiplexer? a) To convert binary signals into analog signals b) To store data c) To select one input from multiple inputs based on the control inputs d) To perform arithmetic operations Answer: c) To select one input from multiple inputs based on the control inputs

9. What is the advantage of using a 2-input 4-bit multiplexer in digital circuits? a) It reduces circuit complexity b) It increases circuit complexity c) It increases the number of wires needed to connect multiple inputs to a single output d) It increases the number of output signals Answer: a) It reduces circuit complexity

10. Which of the following is NOT a typical application for a 2-input 4-bit multiplexer? a) Data compression b) Signal routing c) Address decoding d) Arithmetic operations Answer: d) Arithmetic operations

## Subjective Short Notes Midterm & Finalterm Prepration Past papers included

1. What is a 2-input 4-bit multiplexer?

Answer: A 2-input 4-bit multiplexer is a digital logic circuit that has four data inputs and two selection inputs, and selects one of the four inputs based on the values of the selection inputs.

2. What is the purpose of a 2-input 4-bit multiplexer?

Answer: The purpose of a 2-input 4-bit multiplexer is to select one input from multiple inputs based on the values of the selection inputs, and to output the selected input.

3. How many data inputs does a 2-input 4-bit multiplexer have?

Answer: A 2-input 4-bit multiplexer has four data inputs.

4. How many selection inputs does a 2-input 4-bit multiplexer have?

Answer: A 2-input 4-bit multiplexer has two selection inputs.

5. What is the maximum number of inputs that a 2-input 4-bit multiplexer can select from?

Answer: A 2-input 4-bit multiplexer can select from a maximum of four inputs.

6. How is the output of a 2-input 4-bit multiplexer determined?

Answer: The output of a 2-input 4-bit multiplexer is determined by the values of the selection inputs, which select one of the four data inputs to be output.

7. What is the truth table for a 2-input 4-bit multiplexer? Answer: The truth table for a 2-input 4-bit multiplexer has four rows and eight columns.

8. What is the advantage of using a 2-input 4-bit multiplexer in digital circuits? Answer: The advantage of using a 2-input 4-bit multiplexer in digital circuits is that it reduces circuit complexity by selecting one input from multiple inputs.

9. What are the typical applications of a 2-input 4-bit multiplexer?

Answer: The typical applications of a 2-input 4-bit multiplexer include signal routing, data compression, and address decoding.

10. How is a 2-input 4-bit multiplexer different from a demultiplexer?

Answer: A 2-input 4-bit multiplexer selects one input from multiple inputs, while a demultiplexer selects one output from multiple outputs.

A 2-input 4-bit multiplexer is a type of digital logic circuit that is used to select one input from multiple inputs. It has four data inputs and two selection inputs. The selection inputs are used to choose one of the four data inputs to be output. The output of the multiplexer is a single data signal that corresponds to the selected input. The operation of a 2-input 4-bit multiplexer is based on the Boolean algebraic expression for the output. The output is a logical OR of the selected input and the complement of the selection inputs. The complement of the selection inputs is used to select the other inputs that are not selected by the primary selection inputs. The advantage of using a 2-input 4-bit multiplexer in digital circuits is that it reduces circuit complexity. Instead of using separate circuits for each input, a single circuit can be used to select the desired input. This reduces the number of components needed and makes the circuit easier to design and implement. Typical applications of a 2-input 4-bit multiplexer include signal routing, data compression, and address decoding. In signal routing, the multiplexer is used to switch between different signals that are being transmitted. In data compression, the multiplexer is used to select a subset of data that needs to be compressed. In address decoding, the multiplexer is used to select the memory location where data needs to be read or written. The truth table for a 2-input 4-bit multiplexer has four rows and eight columns. Each row represents a different combination of the selection inputs, and each column represents a different data input. The output column shows the selected input based on the selection inputs. In summary, a 2-input 4-bit multiplexer is a useful digital logic circuit that can be used to select one input from multiple inputs based on the values of the selection inputs. It reduces circuit complexity and is used in a variety of applications such as signal routing, data compression, and address decoding.