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The following thermocouple may be used for measuring temperature upto 1873°K.

A. Chromel-alumel

B. Copper-constantan

C. Platinum-platinum rhodium

D. Iron-constantan

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  13. With increase in temperature, the electrical conductivity of semiconductors
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  21. __________ is not a case hardening process.
  22. __________ of austenite decreases the hardenability in steel.
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