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Cold junction compensation in a thermocouple measurement is needed because the emf depends on

  • A.the length of the leads joining the two junctions
  • B.the resistance of the circuit through which the current flows
  • C.the difference between the two junction temperatures
  • D.the absolute temperature of the measuring junction alone

Answer: C

A reading is meaningless unless the reference junction temperature is known. Either it is held in melting ice or its temperature is measured by a separate sensor and an equivalent emf added electronically, which is how a modern instrument does it.

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