Process Control and Instrumentation
Emf generated in a thermocouple depends on the temperature

Of cold junction only
Of hot junction only
Difference between cold junction and atmospheric temperature
Difference between hot and cold junctions

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Process Control and Instrumentation
Normal mercury thermometer can be used to measure a temperature of about 300°C. However, its maximum temperature measurement range can be increased upto about 500°C by

Filling nitrogen under pressure in the stem
Using steel tube in place of glass tube
Accounting for the tube expansion
Increasing the diameter of the tube

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