Code Converts and Multiplexers Questions and Answers

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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

Showing 10 of 48 questions

31. How many inputs are required for a 1-of-16 decoder?

  • 2
  • 4
  • 8
  • 16
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32. A truth table with output columns numbered 0–15 may be for which type of decoder IC?

  • hexadecimal 1-of-16
  • dual octal outputs
  • binary-to-hexadecimal
  • hexadecimal-to-binary
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33. In a BCD-to-seven-segment converter, why must a code converter be utilized?

  • to convert the 4-bit BCD into 7-bit code
  • to convert the 4-bit BCD into 10-bit code
  • to convert the 4-bit BCD into Gray code
  • No conversion is necessary.
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34. How can the active condition (HIGH or LOW) or the decoder output be determined from the logic symbol?

  • A bubble indicates active-HIGH.
  • A bubble indicates active-LOW.
  • A square indicates active-HIGH.
  • A square indicates active-LOW.
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35. If two inputs are active on a priority encoder, which will be coded on the output?

  • the higher value
  • the lower value
  • neither of the inputs
  • both of the inputs
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36. A circuit that responds to a specific set of signals to produce a related digital signal output is called a(n):

  • BCD matrix
  • display driver
  • encoder
  • decoder
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37. How many select lines would be required for an 8-line-to-1-line multiplexer?

  • 2
  • 3
  • 4
  • 8
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38. In a multiplexer, the data select control inputs are responsible for determining which data input is selected to be transmitted to the data output line.

  • TRUE
  • FALSE
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39. Before you can make a design you must decide if you want an active-HIGH output.

  • TRUE
  • FALSE
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40. The microcontroller needs to use only three input lines to monitor eight separate points.

  • TRUE
  • FALSE
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