The temperature of tempering oil baths maintained at 400°C during he – McqOptions

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1.	The temperature of tempering oil baths maintained at 400°C during heat treatment of steel is measured by a/an __________ thermocouple.
A.	Chromel-alumel
B.	Iron-constantan
C.	Platinum-platinum/rhodium
D.	None of these
Answer» C. Platinum-platinum/rhodium

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