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Chromel-Alumel can be used at a temperature range of __________

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Chromel-Alumel can be used at a temperature range of __________

(a) 300-1400 F

(b) 420-600 F

(c) 800-1000 F

(d) 1200-2200 F

This question was posed to me during an online exam.

My question is taken from Pyrometry and the Types of Pyrometers topic in section Tools of the Metallurgist of Engineering Material & Metallurgy

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Right answer is (d) 1200-2200 F

The explanation: Thermoelectric pyrometer makes use of dissimilar materials for the metallic wires to develop an emf. Chromel-Alumel is a commonly used material containing chromel (nickel and chromium) and alumel (nickel, manganese, aluminum, silicon). It is useful at a temperature range of 1200-2200 F.

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