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A tachometer on a gas turbine normally indicates

  • A.Rotor speed as a percentage of a datum rpm
  • B.Absolute shaft speed in revolutions per minute
  • C.The ratio of compressor to turbine speed
  • D.Thrust as a percentage of maximum

Answer: A

Percentage rpm lets one scale serve engines of very different physical speeds, and 100 per cent is a chosen datum rather than a maximum. Many engines are certified to run briefly above 100 per cent, which surprises those reading the scale as a limit.

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