Extra exam question E8C09
Subelement E8, SIGNALS AND EMISSIONS· Group E8C
Which digital code allows only one bit to change between sequential code values?
- A.Binary Coded Decimal Code
- B.Extended Binary Coded Decimal Interchange Code
- C.Extended ASCII
- D.Gray code (correct answer)
WhyGray code is the digital code that allows only one bit to change between sequential code values. Gray code is specifically designed so that only a single bit changes between any two sequential code values, which avoids the momentary false intermediate values that can occur when multiple bits change at once in an ordinary binary count, answer D. Binary Coded Decimal, Extended Binary Coded Decimal Interchange Code, and Extended ASCII don't have this single-bit-change property between sequential values.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2024-2028 NCVEC Element 4 pool (public domain); the explanation above is original writing, see our methodology.
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