Code Converts and Multiplexers Questions and Answers
Code Converters and Multiplexers are crucial topics in Digital Electronics aptitude questions and answers for exams like GATE, ISRO, DRDO, and BARC. These devices form the backbone of digital systems, helping in signal conversion and data routing. A code converter transforms one type of binary code to another, such as BCD to Gray or binary to excess-3. A multiplexer, on the other hand, selects one of many input signals and forwards it to a single output line. Understanding these concepts strengthens logical and numerical reasoning, especially for electronics and communication aspirants. Explore detailed aptitude questions with solutions PDF and explanations to boost your preparation and master problem-solving in digital circuits effectively.
Code Converts and Multiplexers
21. Why is a demultiplexer called a data distributor?
- The input will be distributed to one of the outputs.
- One of the inputs will be selected for the output.
- The output will be distributed to one of the inputs.
22. What is the status of the inputs S0, S1, and S2 of the 74151 eight-line multiplexer in order for the output Y to be a copy of input I5?
- S0 = 0, S1 = 1, S2 = 0
- S0 = 0, S1 = 0, S2 = 1
- S0 = 1, S1 = 1, S2 = 0
- S0 = 1, S1 = 0, S2 = 1
23. One way to convert BCD to binary using the hardware approach is:
- with MSI IC circuits
- with a keyboard encoder
- with an ALU
- UART
24. A microcontroller differs from a microprocessor in that it has several ________ ports and ________ built into its architecture, making it better suited for ________ applications.
- communication, PROMs, control
- parallel, logic gates, processing
- input/output, memory, control
- data, memory, decoding
25. How is an encoder different from a decoder?
- The output of an encoder is a binary code for 1-of-N input.
- The output of a decoder is a binary code for 1-of-N input.
26. Why is the Gray code more practical to use when coding the position of a rotating shaft?
- All digits change between counts.
- Two digits change between counts.
- Only one digit changes between counts.
27. For the following conditions on a 7485 magnitude comparator, what will be the state of each of the three outputs? A0 = 0 B0 = 1 IA < B = 0 A1 = 1 B1 = 0 IA = B = 1 A2 = 1 B2 = 0 IA > B = 0 A3 = 0 B3 = 0
- A = B = 0, A < B = 0, A > B = 1
- A = B = 0, A < B = 1, A > B = 0
- A = B = 1, A < B = 0, A > B = 0
- A = B = 0, A < B = 0, A > B = 0
28. When two or more inputs are active simultaneously, the process is called:
- first-in, first-out processing
- priority encoding
- ripple blanking
- first-in, first-out processing or priority encoding
29. A binary code that progresses such that only one bit changes between two successive codes is:
- nine's-complement code
- 8421 code
- excess-3 code
- Gray code
30. Which of the following is not a weighted value positional numbering system:
- hexadecimal
- binary-coded decimal
- binary
- octal