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Code Converters and Multiplexers (Digital Electronics) Question and Answers-Page first

# Code Converters and Multiplexers problems

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• 1. How is an encoder different from a decoder?

• Options
• A. The output of an encoder is a binary code for 1-of-N input.
• B. The output of a decoder is a binary code for 1-of-N input.

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• 2. Which of the following is not a weighted value positional numbering system:

• Options
• B. binary-coded decimal
• C. binary
• D. octal

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• 3. What do the mathematical symbols A < b and A > B mean?

• Options
• A. A < B means A is greater than B. A > B means A is less than B.
• B. A > B means A is less than B. A < B means A is greater than B.
• C. A < B means A is less than B. A > B means A is greater than B.

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• 4. 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?

• Options
• A. S0 = 0, S1 = 1, S2 = 0
• B. S0 = 0, S1 = 0, S2 = 1
• C. S0 = 1, S1 = 1, S2 = 0
• D. S0 = 1, S1 = 0, S2 = 1

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• 5. Most demultiplexers facilitate which type of conversion?

• Options
• B. single input, multiple outputs
• C. ac to dc
• D. odd parity to even parity

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• 6. How many outputs are on a BCD decoder?

• Options
• A. 4
• B. 16
• C. 8
• D. 10

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• 7. How can the active condition (HIGH or LOW) or the decoder output be determined from the logic symbol?

• Options
• A. A bubble indicates active-HIGH.
• B. A bubble indicates active-LOW.
• C. A square indicates active-HIGH.
• D. A square indicates active-LOW.

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• 8. How many 74184 BCD-to-binary converters would be required to convert two complete BCD digits to a binary number?

• Options
• A. 8
• B. 4
• C. 2
• D. 1

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• 9. How many possible outputs would a decoder have with a 6-bit binary input?

• Options
• A. 16
• B. 32
• C. 64
• D. 128

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• 10. One application of a digital multiplexer is to facilitate:

• Options
• A. data generation
• B. serial-to-parallel conversion
• C. parity checking
• D. data selector

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