Process Control and Instrumentation
Working principle of bimetallic thermometers is difference in linear co-efficient of thermal expansion of two strips of different metals welded together. Which of the following has the maximum thermal co-efficient of linear expansion?

Nickel
Invar
Chromel
Brass

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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

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

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