# Digital Electronics - Code Converters and Multiplexers

### Exercise :: Code Converters and Multiplexers - General Questions

31.

A binary code that progresses such that only one bit changes between two successive codes is:

 A. nine's-complement code B. 8421 code C. excess-3 code D. Gray code

Answer: Option D

Explanation:

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32.

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

 A. hexadecimal B. binary-coded decimal C. binary D. octal

Answer: Option B

Explanation:

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33.

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

 A. 2 B. 4 C. 8 D. 16

Answer: Option B

Explanation:

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34.

A truth table with output columns numbered 0–15 may be for which type of decoder IC?

 A. hexadecimal 1-of-16 B. dual octal outputs C. binary-to-hexadecimal D. hexadecimal-to-binary

Answer: Option A

Explanation:

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35.

In a BCD-to-seven-segment converter, why must a code converter be utilized?

 A. to convert the 4-bit BCD into 7-bit code B. to convert the 4-bit BCD into 10-bit code C. to convert the 4-bit BCD into Gray code D. No conversion is necessary.

Answer: Option A

Explanation:

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