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A stroboscopic tachometer is preferred to a contact type when the shaft is

  • A.turning below one revolution per second
  • B.of a diameter larger than the instrument
  • C.coupled directly to its driven machine
  • D.inaccessible or turning too fast to touch

Answer: D

Flashing a lamp until the mark appears stationary needs no contact at all, which suits a guarded or fast shaft. The risk is reading a submultiple of the true speed, so the frequency is scanned upward until the pattern first freezes.

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