Emf developed by a thermocouple while measuring a temperature of 800°C is about 31 mV. The type of thermocouple used is________________?
Correct answer: C. Chromel-alumel
- A. Platinum-platinum + rhodium
- B. Iron-constantan
- C. Chromel-alumel
- D. None of these
Explanation
A chromel-alumel thermocouple, also called Type K, develops roughly 31 to 33 mV at 800°C when referenced to 0°C. Platinum-rhodium produces a much smaller emf, while iron-constantan produces a higher value.
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