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A rotary encoder giving a Gray coded output is preferred to one giving a plain binary output because

  • A.the Gray code can be read by a smaller number of tracks on the disc
  • B.the Gray code is directly usable by an arithmetic circuit
  • C.the Gray code allows the direction of rotation to be determined
  • D.only one bit changes between adjacent positions

Answer: D

In plain binary several bits change at once at some boundaries, and any slight misalignment of the tracks then gives a wildly wrong reading during the transition. With one bit changing at a time the worst error possible is one count.

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