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Moving the core of an LVDT to either side of the null produces an output that

  • A.rises in proportion to the displacement but gives no indication of direction
  • B.falls from the maximum reached at the null position
  • C.changes in frequency rather than in amplitude
  • D.rises in proportion to the displacement, with a phase that reveals the direction

Answer: D

The magnitude tells how far the core has moved and the phase, in step with the primary on one side and reversed on the other, tells which way. A phase-sensitive detector therefore yields a direct voltage that is both signed and proportional.

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