Q. An optical pyrometer works on the principle of

(A) Expansion of fluids
(B) Mono-chromatic radiation
(C) Thermo-electric effect
(D) Total radiation

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✅ Correct Answer: (B) Mono-chromatic radiation

Published by Mr. Dubey ⭐ 111.54K Points at 20-Sep-2023 12:23 pm in Heat Engines

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