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A stroboscopic reading may be a submultiple of the true speed because the mark appears stationary when the flash rate is

  • A.any integer fraction of the rotational rate
  • B.exactly equal to the rotational rate only
  • C.any integer multiple of the rotational rate
  • D.unrelated to the rotational rate

Answer: A

Flashing once every two or three revolutions freezes the mark just as convincingly as flashing once per revolution. Approaching from below and taking the first freeze, or checking against the nameplate, avoids the error.

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