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__________are used as protecting tubes in thermocouples above 2000 F.

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__________are used as protecting tubes in thermocouples above 2000 F.

(a) Wrought iron

(b) 14% chrome iron

(c) Nichrome

(d) Porcelain

I had been asked this question in an interview for internship.

Enquiry is from Pyrometry and the Types of Pyrometers in division Tools of the Metallurgist of Engineering Material & Metallurgy

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Correct answer is (d) Porcelain

The explanation: Thermocouples are often covered using protecting tubes. Wrought iron or cast iron can be used as a protecting tube up to 1300 F. 14% chrome iron is used up to 1500 F, whereas 28% chrome iron or nichrome is used up to 2000 F. Above this temperature, porcelain or silicon carbide tubes are used.

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