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A drive required to hold an exact number of revolutions per unit of product length is best served by

  • A.an induction machine with rotor resistance control
  • B.a dc series machine with armature resistance control
  • C.a stator voltage controlled induction machine
  • D.a synchronous machine or a position-controlled drive

Answer: D

Any slip at all accumulates into a positional error over a long run, which a synchronous machine avoids by construction and a closed-loop position drive avoids by feedback. Slip-dependent methods cannot hold such a ratio.

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