Temperature of molten pig iron (1450°C) and molten slag (1500°C) flowing out of a blast furnace is measured by a/an_______________?
Correct answer: D. Either B. or C.
- A. Chromel-alumel thermocouple
- B. Optical pyrometer
- C. Radiation pyrometer
- D. Either B. or C.
Explanation
Molten iron and slag are too hot for ordinary contact thermometers, so non-contact optical or radiation pyrometers are used. Therefore, either option B or C is defensible.
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