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

Chromel-alumel
None of these
Platinum-platinum/rhodium
Iron-constantan

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Process Control and Instrumentation
Vapour actuated pressure spring thermometer does not require ambient temperature compensation. Ambient temperature compensation is provided in gas or liquid expansion pressure spring thermometer by

Reducing the volume of the capillary to a minimum
Reducing the volume of the receiving element to a minimum
All of these
Making the volume of thermometer bulb as large as conveniently possible

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