Emf developed by a thermocouple while measuring a temperature of 400°C is 22 mV. The type of thermocouple used is ___________________?
Correct answer: B. Iron-constantan
- A. Chromel-alumel
- B. Iron-constantan
- C. Platinum-rhodium
- D. Platinum-platinum + rhodium
Explanation
An iron-constantan thermocouple, type J, produces approximately 22 mV at 400°C with a 0°C reference. Chromel-alumel gives about 16 mV, while platinum-rhodium types give much smaller voltages at this temperature.
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