Question

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: (b).iron-constantan

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Q. The temperature of tempering oil baths maintained at 400°C during heat treatment of steel is measured by a/an __________ thermocouple.

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