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A thermocouple of the type used for the highest temperatures is made of

  • A.copper and constantan
  • B.iron and constantan
  • C.chromel and alumel
  • D.platinum and platinum rhodium

Answer: D

The noble metal pair withstands over sixteen hundred degrees and is very stable, which is why it defines part of the temperature scale. Its output per degree is small and it is expensive, so base metal pairs are used wherever they will serve.

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