Code Converters and Multiplexers for Competitive Exams

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Code Converters and Multiplexers

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Code Converters and Multiplexers MCQ & Objective Questions

Understanding "Code Converters and Multiplexers" is crucial for students preparing for various exams. These topics not only form a significant part of the syllabus but also help in enhancing problem-solving skills. Practicing MCQs and objective questions on these subjects can significantly improve your exam performance and boost your confidence. By focusing on important questions and practice questions, you can ensure a solid grasp of the concepts, which is essential for effective exam preparation.

What You Will Practise Here

Types of code converters: Binary to Decimal, Decimal to Binary, etc.
Understanding multiplexers and their applications in digital circuits.
Key formulas related to code conversion and multiplexing.
Diagrams illustrating the working of code converters and multiplexers.
Definitions of essential terms and concepts in digital electronics.
Real-world applications of code converters and multiplexers.
Sample problems and solutions to reinforce learning.

Exam Relevance

The topics of Code Converters and Multiplexers frequently appear in CBSE, State Boards, and competitive exams like NEET and JEE. Students can expect questions that test their understanding of the conversion processes, the functioning of multiplexers, and their applications. Common question patterns include multiple-choice questions that require students to identify the correct output of a code conversion or to analyze the configuration of a multiplexer circuit.

Common Mistakes Students Make

Confusing the different types of code converters and their functions.
Misunderstanding the logic behind multiplexer selection inputs.
Overlooking the importance of binary number systems in conversions.
Failing to practice with diagrams, which can lead to errors in circuit analysis.
Not reviewing key formulas, resulting in mistakes during calculations.

FAQs

Question: What are the main types of code converters?
Answer: The main types include Binary to Decimal, Decimal to Binary, BCD to Decimal, and Hexadecimal to Binary converters.

Question: How do multiplexers work in digital circuits?
Answer: Multiplexers select one of many input signals and forward the selected input into a single line, based on control signals.

Now is the time to take your understanding to the next level! Dive into solving practice MCQs on Code Converters and Multiplexers to test your knowledge and prepare effectively for your exams. Your success starts with practice!

Q. How many outputs does an 8-to-1 multiplexer have?

A. 1
B. 2
C. 8
D. 16

Solution

An 8-to-1 multiplexer has 1 output, which is selected from 8 different input lines.

Correct Answer: A — 1

Q. How many select lines are needed for a 16-to-1 multiplexer?

A. 2
B. 3
C. 4
D. 5

Solution

A 16-to-1 multiplexer requires 4 select lines because 2^4 = 16.

Correct Answer: C — 4

Q. In a 4-to-1 multiplexer, how many select lines are required?

A. 1
B. 2
C. 3
D. 4

Solution

A 4-to-1 multiplexer requires 2 select lines to choose one of the four input lines.

Correct Answer: B — 2

Q. In a binary to decimal converter, what is the decimal equivalent of the binary number 1011?

A. 8
B. 10
C. 11
D. 13

Solution

The binary number 1011 is equal to 1*2^3 + 0*2^2 + 1*2^1 + 1*2^0 = 8 + 0 + 2 + 1 = 11.

Correct Answer: C — 11

Q. What is the Gray code equivalent of the binary number 1101?

A. 1011
B. 1110
C. 1000
D. 1010

Solution

To convert binary 1101 to Gray code, the first bit remains the same (1), and each subsequent bit is found by XORing the current bit with the previous bit: 1 XOR 1 = 0, 1 XOR 0 = 1, 0 XOR 1 = 1, resulting in Gray code 1011.

Correct Answer: A — 1011

Q. What is the main advantage of using a multiplexer in digital circuits?

A. Reduces the number of data lines
B. Increases the speed of data processing
C. Simplifies circuit design
D. All of the above

Solution

Multiplexers help reduce the number of data lines, increase processing speed, and simplify circuit design.

Correct Answer: D — All of the above

Q. What is the output of a 2-to-1 multiplexer if the inputs are A=0, B=1 and the select line is 0?

A. 0
B. 1
C. Undefined
D. Both 0 and 1

Solution

If the select line is 0, the output of the 2-to-1 multiplexer will be the value of input A, which is 0.

Correct Answer: A — 0

Q. What is the output of a 4-to-1 multiplexer if the inputs are A=0, B=1, C=0, D=1 and the select lines are S0=1, S1=0?

A. 0
B. 1
C. 1
D. 0

Solution

The select lines S0=1 and S1=0 select input B, which is 1.

Correct Answer: B — 1

Q. What is the output of a binary to BCD converter for the binary input 10010?

A. 0010
B. 0001 0010
C. 0001 0000
D. 0011

Solution

The binary input 10010 is equal to decimal 18, which is represented in BCD as 0001 0010.

Correct Answer: B — 0001 0010

Q. What is the output of a binary to BCD converter for the binary input 1001?

A. 0001 0001
B. 0000 1001
C. 0000 0001
D. 0000 1000

Solution

The binary input 1001 is equal to 9 in decimal, which is represented as 0000 1001 in BCD.

Correct Answer: B — 0000 1001

Q. What is the output of a binary to gray code converter for the binary input 1011?

A. 1110
B. 1100
C. 1001
D. 1010

Solution

The gray code equivalent of the binary number 1011 is 1110.

Correct Answer: A — 1110

Q. What is the output of a decimal to binary converter for the decimal number 10?

A. 1010
B. 1001
C. 1100
D. 1110

Solution

The binary equivalent of the decimal number 10 is 1010.

Correct Answer: A — 1010

Q. What is the primary function of a binary to decimal converter?

A. To convert decimal numbers to binary
B. To convert binary numbers to decimal
C. To convert hexadecimal numbers to binary
D. To convert binary numbers to octal

Solution

A binary to decimal converter takes a binary number and converts it into its decimal equivalent.

Correct Answer: B — To convert binary numbers to decimal

Q. What type of code converter is used to convert binary numbers to Gray code?

A. Binary to BCD converter
B. Binary to Gray code converter
C. BCD to binary converter
D. Decimal to binary converter

Solution

A binary to Gray code converter is specifically designed to convert binary numbers into their corresponding Gray code.

Correct Answer: B — Binary to Gray code converter

Q. What type of code does a binary to Gray code converter produce?

A. A code that minimizes errors in digital communication
B. A code that is easier to read
C. A code that represents numbers in a different base
D. A code that is used for error detection

Solution

A binary to Gray code converter produces a code that minimizes errors in digital communication by changing only one bit at a time.

Correct Answer: A — A code that minimizes errors in digital communication

Q. Which logic gate is commonly used to implement a multiplexer?

A. AND gate
B. OR gate
C. NOT gate
D. NAND gate

Solution

Multiplexers are commonly implemented using a combination of AND and OR gates.

Correct Answer: B — OR gate

Q. Which of the following is a characteristic of a multiplexer?

A. It can only handle binary inputs
B. It can select one input from multiple inputs
C. It converts binary to decimal
D. It is a type of memory device

Solution

A multiplexer is designed to select one input from multiple inputs based on the select lines.

Correct Answer: B — It can select one input from multiple inputs

Q. Which of the following is a common application of a multiplexer?

A. Data routing
B. Data storage
C. Data encryption
D. Data compression

Solution

Multiplexers are commonly used for data routing, allowing multiple signals to share a single communication line.

Correct Answer: A — Data routing

Q. Which of the following is NOT a type of multiplexer?

A. 2-to-1 multiplexer
B. 4-to-1 multiplexer
C. 8-to-1 multiplexer
D. 1-to-4 multiplexer

Solution

A 1-to-4 multiplexer is not a standard type; multiplexers typically have more inputs than outputs.

Correct Answer: D — 1-to-4 multiplexer

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