Temperature of _____________ cannot be measured by an optical or radiation pyrometer?
Correct answer: A. Hot blast (air) from stoves
- A. Hot blast (air) from stoves
- B. Molten slag flowing out of blast furnace
- C. Combustion space in boilers
- D. Rotary limestone calcination kiln
Explanation
A radiation or optical pyrometer requires sufficient emitted radiation from the target, whereas hot air is essentially non-luminous and has weak, difficult-to-measure emission. Molten slag, flames, and hot kiln surfaces provide much stronger radiation signals.
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