-- card: 55937 from stack: in
-- bmap block id: 0
-- flags: 4000
-- background id: 7720
-- name: #184
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on openCard
  global group,rightone
  put 19 into group
  put "B" into rightone
  pass openCard
end openCard



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Question #19

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4BE-1.7 What is an "optical shaft encoder"?

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An array of optocouplers chopped by a stationary wheel

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An array of optocouplers whose light transmission path is controlled by a rotating wheel

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An array of optocouplers whose propagation velocity is controlled by a stationary wheel

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An array of optocouplers whose propagation velocity is controlled by a rotating wheel

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Correct answer is B