For measuring the temperature of a red hot furnace, which is the most suitable instrument ?
Correct answer: C. Optical pyrometer
- A. Platinum resistance thermometer
- B. Thermocouple
- C. Optical pyrometer
- D. Bimetallic thermometer
Explanation
An optical pyrometer measures the radiation emitted by a hot surface without contacting it, making it suitable for a red-hot furnace. Platinum resistance thermometers and bimetallic thermometers cannot tolerate such temperatures.
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