The temperature inside a furnace is usually measured by which of the following ?
Correct answer: A. Optical pyrometer
- A. Optical pyrometer
- B. Mercury thermometer
- C. Alcohol thermometer
- D. Any of the above
Explanation
An optical pyrometer measures furnace temperature from the thermal radiation emitted by the hot interior or charge, without needing physical contact. Mercury and alcohol thermometers cannot withstand typical furnace temperatures.
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